Binding to double = UpdateSourceTrigger=PropertyChanged.

<TextBox Text="{Binding eMin,UpdateSourceTrigger=PropertyChanged,StringFormat={}{0:0.##}}" Grid.Row="1" Grid.Column="1" Style="{DynamicResource ReadOnlyStyle}"/>
public double eMin
get { return _eMin; }
set { _eMin = value;
NotifyPropertyChanged();
Basically, when I want to type for example, 2.5, I have to first type 25 and then put a dot in between 2 & 5. It's because I set UpdateSourceTrigger=PropertyChanged.
Now I got to implement UpdateSourceTrigger as discussed
in here, for all textbox.

Change the StringFormat to #:#.## and you should be fine:
<TextBox Text="{Binding eMin,UpdateSourceTrigger=PropertyChanged,StringFormat={}{#:#.##}}" Grid.Row="1" Grid.Column="1" Style="{DynamicResource ReadOnlyStyle}"/>
Please remember to close your threads by marking helpful posts as answer.

Similar Messages

Underflow Exception when trying to bind small double to BINARY_DOUBLE

I get exception when trying to insert small double value (1.0E-131) into BINARY_DOUBLE column via jdbc.
The exception I get:
Exception in thread "main" java.sql.SQLException: Underflow Exception trying to bind 1.0000000000000001E-131
at oracle.jdbc.driver.DoubleBinder.bind(OraclePreparedStatement.java:13856)
at oracle.jdbc.driver.OraclePreparedStatement.setupBindBuffers(OraclePreparedStatement.java:2866)
at oracle.jdbc.driver.OraclePreparedStatement.processCompletedBindRow(OraclePreparedStatement.java:2151)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3280)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3390)
at dbAccess.main(dbAccess.java:18)
According to oracle documentation the smallest positive number the BINARY_DOUBLE column can store is 2.22507485850720E-308.
I'm using oracle 10g r2 and thin jdbc driver.
Any ideas?

That is expected since a double is converted to a Oracle NUMBER before passing it to the database and Oracle NUMBER does not support 1.0e-131, the range is 1E-130 .. 10E125.
Look at the SQL output below,
SQL> select to_char(to_number(1.0e-131)) from dual;
T
0
SQL> select to_char(to_number(1.0e-130)) from dual;
TO_CHAR(TO_NUMBER(1.0E-130))
1.000000000000000000000000000000000E-130
==
Use oracle.sql.BINARY_DOUBLE for numbers like this.
eg:
preparedStatement.setBINARY_DOUBLE(1, new oracle.sql.BINARY_DOUBLE(1.0e-131));
==
hope this helps.
Ashok

XAML Binding for relationship property

hi,
I'm trying to bind a relationship property to a TextBox in a XAML form.
<ListView VerticalAlignment="Top" x:Name="listviewtest" MinHeight="350" ItemsSource="{Binding Path=componentalias, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">
<ListView.View>
<GridView>
<GridViewColumn Header="Field1"
DisplayMemberBinding="{Binding Path=field1}"
Width="Auto" />
<GridViewColumn Header="Field2"
DisplayMemberBinding="{Binding field2}"
Width="Auto" />
<GridViewColumn Header="Field3"
Width="Auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=relationshipproperty, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
What am I missing?
thanks!

Sorry about that! Folks tend to use "relationship" and "property" interchangeably.
Are you using the console API (The IDataItem stuff)? If so, I'm not sure if relationship property binding is supported. The console API does have interfaces for relationship objects (in the form of the EnterpriseManagementRelationshipObjectDataType class),
however, I'm not sure how (or even if) they exist within an IDataItem or BindableCachedDataItem projection.
For reference, the windows computer form displays an Installed Software item's "Installed Date" which is a relationship property. However, the windows computer form exposes that property via a viewmodel proxy. It doesn't get the InstalledDate from
the IDataItem..instead, it queries the SDK (technically the DAS) for the relationship's properties, then loads them into the viewmodel proxy. Only one-way binding is supported though..there's no mechanism to update the installed date from the form. In
order to update a relationship property with the proxy method, you would have to update the relationship properties later via the standard SDK..which would be problematic at best (it would probably cause collisions), and would be convoluted to implement anyway.
Mixing Console API updates and SDK updates is rarely a good idea.
I'll dig into the console API a little bit and see if relationship properties/binding are supported at all. I'm curious now.

Notify changes

It would be nice if once a week, an e-mail could be received to notify what is added or changed to/on otn, prefered per catogory (XML,Java,PL/SQL and so on).

Several options.
You could use the current item with a shared collection like this:
https://gallery.technet.microsoft.com/Dynamic-XAML-Composed-View-e087f3c1
and
http://social.technet.microsoft.com/wiki/contents/articles/29859.wpf-tips-bind-to-current-item-of-collection.aspx
Note the / notation for current item
<local:EditRow LabelFor="First Name:" >
<TextBox Text="{Binding PeopleCollectionView/FirstName, UpdateSourceTrigger=PropertyChanged}"/>
</local:EditRow>
<local:EditRow LabelFor="Middle Name:">
<TextBox Text="{Binding PeopleCollectionView/MiddleName, UpdateSourceTrigger=PropertyChanged}"/>
</local:EditRow>
Or you could send an mvvm light message and react to that - using this technique
http://social.technet.microsoft.com/wiki/contents/articles/26070.communicating-between-classes.aspx
Hope that helps.
Recent Technet articles:
Property List Editing;
Dynamic XAML

TwoWay binding doesn't work using StringFormat={}{#:#.####}, why and how to fix it?

<TextBox Text="{Binding doResult,UpdateSourceTrigger=PropertyChanged,StringFormat={}{#:#.####},Mode=TwoWay}" Grid.Row="8" Grid.Column="1" Visibility="{Binding ODvisbility,Converter={StaticResource BooleanToVisibilityConverter}}" Style="{Binding ODStyle}"/>
After changing the stringFormat from 0:0.#### to #:#.#### twoWay binding has stop responding.
I fixed one problem and end up with another!

It is hard to say without having seen all of your code. The information in your last post says nothing but there seems to be nothing wrong with the StringFormat as the property gets set as expected using the sample code I posted. You can try it for yourself
if you don't believe.
Please upload a reproducable sample of your issue to OneDrive and post the link to it here if you want anyone to be able to be able to get a clue on what is going on in your application.
Edit:
Now I see, it is the target property doesn't get set correcty. Please describe your issue in a bit more detail in the future :)
Well, StringFormat and UpdateSourceTrigger=PropertyChanged is not a really good combination all the time. You should probably remove the StringFormat and try to handle the formatting logic yourself by for example using a converter. Something like this:
class DoubleConverter : IValueConverter
bool addDecimalPoint;
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
double d = (double)value;
string s = d.ToString("#.##", System.Globalization.CultureInfo.InvariantCulture);
if (addDecimalPoint) {
s += ".";
addDecimalPoint = false;
return s;
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
string s = value.ToString();
if (s.EndsWith(".")) {
s += "0";
addDecimalPoint = true;
double d;
if (double.TryParse(s, System.Globalization.NumberStyles.AllowDecimalPoint, System.Globalization.CultureInfo.InvariantCulture, out d))
return d;
return value;
<TextBox Text="{Binding doResult,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay, Converter={StaticResource doubleConverter}}" />
Please refer to the following page for more information about converters:
https://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter(v=vs.110).aspx
Using StringFormat and UpdateSourceTrigger=PropertyChanged will probably not work anyway.
Please remember to mark helpful posts as answer and/or helpful.

Applying binding after the Windows's Initialization?

I searched a lot to find a solution to get the ActualWidth of an image in a ViewModel class. The solution is [Link]. I am trying to change the
width/height of the Image at runtime using a slider. When the image is inserted, I want to get the actualHeight of the Image and increase/decrease the size according to slider in percentage so that it'll stay in correct aspect ratio. As I have set the Image
width/height to bind to the property in the VM and until the image is loaded I won't know the image size, it sets it to 0. Henceforth the percentage increase of 0 = 0!
Here is the code:
<Image x:Name="GraphImage" Source="{Binding ImageSrc,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Width="{Binding ImageWidth,UpdateSourceTrigger=PropertyChanged}" Height="{Binding ImageHeight,UpdateSourceTrigger=PropertyChanged}">
<pb:PushBindingManager.PushBindings>
<pb:PushBinding TargetProperty="ActualHeight" Path="Height"/>
<pb:PushBinding TargetProperty="ActualWidth" Path="Width"/>
</pb:PushBindingManager.PushBindings> </Image>
public double ZoomValue
get { return _ZoomValue; }
set
_ZoomValue = value;
ImageHeight = (_ZoomValue / 100 * Height) + Height;
ImageWidth = (_ZoomValue / 100 * Width) + Width;
NotifyPropertyChanged();

>>I have bind the Width and Height of Image to the VM properties, before initializing the image, its width and height are set to 0. Thereafter, the ActualWidth and ActualHeight are set to 0 also.
Of course the ActualWidth and ActualHeight are 0 if you have set the height and width properties to 0...you can specify default values in the view model class if you want the image to have a default size before the sliders have been touched, e.g:
private int _imageWidth = 50; //default width
public int ImageWidth
get { return _imageWidth; }
set { _imageWidth = value; }
>>I need to somehow send the ActualWidth before setting its Width.
Why? The ActualWidth will always 0 before the Width has been set anyway. If you want to know the value of the ActualWidth property whenever the Width property changes, you could handle the SizeChanged event for the Image and send a message to the VM in the
event handler:
<Image x:Name="GraphImage" Source="..."
SizeChanged="GraphImage_SizeChanged"
Width="{Binding ImageWidth,UpdateSourceTrigger=PropertyChanged}"
/>
private void GraphImage_SizeChanged(object sender, SizeChangedEventArgs e)
Image image = sender as Image;
double actualWidth = image.ActualWidth;
//send to VM using messenger....
This event is invoked whenever the size changes.
The other option is to keep a loose reference to the view (the view implements an interface with a "GetActualWidth" method which is implemented to return the ActualWidth of the Image element) in the view model class and get the ActualWidth in the
setter of the ImageWidth source property:
public int ImageWidth
get { return _imageWidth; }
set
_imageWidth = value;
double actualWidth = _viewReference.GetActualWidth();
//do whatever...
You pass the view reference to the view model class when you create it:
this.DataContext = new ViewModel(this);
Please remember to mark helpful posts as answer and/or helpful.

Bind Multibinding Textbox using MVVM and Entity Framework

I have 4 textboxes like, 3 take value and multiply it with corresponding bills
<TextBox Text="{Binding Path=Amount.Bill100,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox100Bills" Grid.Column="2" Grid.Row="1" Margin="7"></TextBox>
<TextBox Text="{Binding Path=Amount.Bill50,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox50Bills" Grid.Column="2" Grid.Row="2" Margin="7"></TextBox>
<TextBox Text="{Binding Path=Amount.Bill20,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox20Bills" Grid.Column="2" Grid.Row="3" Margin="7"></TextBox>
mLast text box adds the value and shows it like this
<TextBox Grid.Column="2" IsReadOnly="True" Grid.Row="7" Grid.ColumnSpan="2" Margin="7" Name="TotalAmount">
<TextBox.Text>
<MultiBinding Converter="{ikriv:MathConverter}" ConverterParameter="x+y+z" Mode="TwoWay">
<Binding Path="Text" ElementName="TextBox100Bills" />
<Binding Path="Text" ElementName="TextBox50Bills" />
<Binding Path="Text" ElementName="TextBox20Bills" />
</MultiBinding>
</TextBox.Text>
</TextBox>
How to bind this textbox to my entity properties the way I bind the 1st three.So that I will get all data in my entity object and save it in data base

Whatever you are doing in your converter class you might as well do in your view model class and then you bind the 4th TextBox to another property (NewProperty in the sample code below) that gets set whenever the value of any the first three
properties is changed:
public class YourViewModel : System.ComponentModel.INotifyPropertyChanged
//+ the rest of your view model class...
public double Bill100
get { return Amount.Bill100; }
set
Amount.Bill100 = value;
OnPropertyChanged("Bill100");
this.NewProperty = this.Bill100 + this.Bill20 + this.Bill50;
public double Bill50
get { return Amount.Bill50; }
set
Amount.Bill50 = value;
OnPropertyChanged("Bill50");
this.NewProperty = this.Bill100 + this.Bill20 + this.Bill50;
public double Bill20
get { return Amount.Bill20; }
set
Amount.Bill20 = value;
OnPropertyChanged("Bill20");
this.NewProperty = this.Bill100 + this.Bill20 + this.Bill50;
private string _newProperty;
public string NewProperty
get { return _newProperty; }
set { _newProperty = value; OnPropertyChanged("NewProperty"); }
private void OnPropertyChanged(string property)
if (PropertyChanged != null)
PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(property));
public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
<TextBox Text="{Binding Path=Bill100,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox100Bills" Grid.Column="2" Grid.Row="1" Margin="7"></TextBox>
<TextBox Text="{Binding Path=Bill50,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox50Bills" Grid.Column="2" Grid.Row="2" Margin="7"></TextBox>
<TextBox Text="{Binding Path=Bill20,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Name="TextBox20Bills" Grid.Column="2" Grid.Row="3" Margin="7"></TextBox>
<TextBox Grid.Column="2" IsReadOnly="True" Grid.Row="7" Grid.ColumnSpan="2" Margin="7" Name="TotalAmount"
Text="{Binding NewProperty}"></TextBox>
You then save the value of the new property (NewProperty).
Note that the view model class must implement the INotifyPropertyChanged interface for the TextBoxes to get updated automatically when you set the value of the data bound source property:
https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=vs.110).aspx.
You cannot get the value of a two-way binding from one property and then set the value of another property.
Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question.

Drag and Drop (and re-order) to ListBox binded to XML

Would you please help me with this scenario:
On stage, 2 listboxes and a textbox.
1.The first listbox lists all the items available, the list is grouped by 'Type' and its source is a binded XML file (read only).
2.The second listbox list all the items the user has dropped into from ListBox#1 and it should read from an XML at start-up and save to it on quitting.
3.The textbox list the details of the currently selected item in ListBox#2
My knowledge (and search on internet ) allowed me to achieve binding, grouping with an expander and perhaps the first step to drag item (to be verified)..but I'm
stucked at dropping AND re-ordering items on ListBox#2..then saving to the XML!!
Would you please help (even in c#..I'll try to do the translation) ? I join a graphic and the project file (with XML files inside) to help you help me! Thanks!!
Download project
The XAML
<Window x:Class="MainWindow"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
   xmlns:dat="clr-namespace:System.Windows.Data;assembly=PresentationFramework"
   Title="MainWindow" Height="400" Width="525">
   <Grid>
   <Grid.Resources>
   <DataTemplate x:Key="Resource3">
   <Label Content="{Binding XPath=Name}"/>
   </DataTemplate>
   <Style x:Key="ListBoxItemStyle1" TargetType="{x:Type ListBoxItem}">
   <EventSetter Event="ListBoxItem.PreviewMouseLeftButtonDown" Handler="s_PreviewMouseLeftButtonDown" />
   </Style>
   <Style x:Key="ListBoxItemStyle2" TargetType="{x:Type ListBoxItem}">
   <Setter Property="AllowDrop" Value="true"/>
   <EventSetter Event="ListBoxItem.PreviewMouseLeftButtonDown" Handler="s_PreviewMouseLeftButtonDown" />
   <EventSetter Event="ListBoxItem.Drop" Handler="listbox_Drop"/>
   </Style>
   </Grid.Resources>
   <Grid Name="Grid01">
   <Grid.Resources>
   <CollectionViewSource x:Key="cvsSystems" Source="{Binding XPath=System}">
   <CollectionViewSource.SortDescriptions>
   <scm:SortDescription PropertyName="@Type"/>
   <scm:SortDescription PropertyName="Name"/>
   </CollectionViewSource.SortDescriptions>
   <CollectionViewSource.GroupDescriptions>
   <dat:PropertyGroupDescription PropertyName="@Type"/>
   </CollectionViewSource.GroupDescriptions>
   </CollectionViewSource>
   </Grid.Resources>
   <ListBox ItemsSource="{Binding Source={StaticResource
cvsSystems}}" ItemTemplate="{StaticResource Resource3}"
SelectedValuePath="Name" IsSynchronizedWithCurrentItem="True"
HorizontalAlignment="Left" x:Name="ListBox1" Width="160"
ItemContainerStyle="{DynamicResource ListBoxItemStyle1}"
Margin="0,0,0,0">
   <ListBox.GroupStyle>
   <GroupStyle>
   <GroupStyle.ContainerStyle>
   <Style TargetType="{x:Type GroupItem}">
   <Setter Property="Template">
   <Setter.Value>
   <ControlTemplate>
   <Expander Header="{Binding Name}" IsExpanded="True">
   <ItemsPresenter />
   </Expander>
   </ControlTemplate>
   </Setter.Value>
   </Setter>
   </Style>
   </GroupStyle.ContainerStyle>
   </GroupStyle>
   </ListBox.GroupStyle>
   </ListBox>
   </Grid>
   <Grid Name="Grid02">
   <Grid.Resources>
   <CollectionViewSource x:Key="cvsPreferences" Source="{Binding XPath=System}">
   <CollectionViewSource.SortDescriptions>
   <scm:SortDescription PropertyName="@Type"/>
   <scm:SortDescription PropertyName="Name"/>
   </CollectionViewSource.SortDescriptions>
   <CollectionViewSource.GroupDescriptions>
   <dat:PropertyGroupDescription PropertyName="@Type"/>
   </CollectionViewSource.GroupDescriptions>
   </CollectionViewSource>
   </Grid.Resources>
   <ListBox ItemsSource="{Binding Source={StaticResource
cvsPreferences}}" ItemTemplate="{StaticResource Resource3}"
SelectedValuePath="Name" IsSynchronizedWithCurrentItem="True"
HorizontalAlignment="Left" x:Name="ListBox2" Width="160"
ItemContainerStyle="{DynamicResource ListBoxItemStyle2}"
Margin="170,0,0,0"/>
   <Button Content="Save" Height="23"
HorizontalAlignment="Left" Margin="385,320,0,0" Name="Button1"
VerticalAlignment="Top" Width="75" />
   </Grid>
   <TextBox DataContext="{Binding SelectedItem,
ElementName=ListBox2}" Text="{Binding
UpdateSourceTrigger=PropertyChanged, XPath=Detail}" Margin="340,0,0,0"
x:Name="TextBox1" HorizontalAlignment="Left" VerticalAlignment="Top"
Width="160"/>
   </Grid>
</Window>
The VB code
Imports System.IO
Imports System.Xml
Class MainWindow
   Dim sysdata As XmlDocument = New XmlDocument()
   Dim prefdata As XmlDocument = New XmlDocument()
   Dim systemdata As XmlDataProvider = New XmlDataProvider()
   Dim preferencedata As XmlDataProvider = New XmlDataProvider()
   Private Sub MainWindow_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
   'Initialisation XML
   sysdata.Load(System.AppDomain.CurrentDomain.BaseDirectory & "Systems.xml")
   prefdata.Load(System.AppDomain.CurrentDomain.BaseDirectory & "Preferences.xml")
   systemdata.Document = sysdata
   preferencedata.Document = prefdata
   systemdata.XPath = "Systems"
   preferencedata.XPath = "Systems"
   Grid01.DataContext = systemdata
   Grid02.DataContext = preferencedata
   End Sub
   Private Sub s_PreviewMouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
   If TypeOf sender Is ListBoxItem Then
   Dim draggedItem As ListBoxItem = TryCast(sender, ListBoxItem)
   DragDrop.DoDragDrop(draggedItem, draggedItem.DataContext, DragDropEffects.Copy)
   draggedItem.IsSelected = True
   End If
   End Sub
   Private Sub listbox_Drop(ByVal sender As Object, ByVal e As DragEventArgs)
   End Sub
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
   preferencedata.Document.Save(System.AppDomain.CurrentDomain.BaseDirectory & "Preferences.xml")
   End Sub
End Class

Barry,
Thank you very much for your reply...I've followed your advices, read the links you posted...and maked use of ObservableCollection.
So, the listbox source is a CollectionViewSource whose source is an ObservableCOllection object.
Unfortunately I'm still stucked at the drop part. (then there will be the save back to the xml file)
I think that the drag part might be right !?
Could someone please help ??
XAML
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
xmlns:dat="clr-namespace:System.Windows.Data;assembly=PresentationFramework"
xmlns:c="clr-namespace:WpfApplication1"
Title="MainWindow" Height="400" Width="525">
<Window.Resources>
<c:NameList x:Key="NameListData"/>
<c:PreferenceList x:Key="PreferenceListData"/>
</Window.Resources>
<Grid>
<Grid.Resources>
<Style x:Key="ListBoxItemStyle1" TargetType="{x:Type ListBoxItem}">
<EventSetter Event="ListBoxItem.PreviewMouseLeftButtonDown" Handler="s_PreviewMouseLeftButtonDown" />
</Style>
<Style x:Key="ListBoxItemStyle2" TargetType="{x:Type ListBoxItem}">
<Setter Property="AllowDrop" Value="true"/>
<EventSetter Event="ListBoxItem.PreviewMouseLeftButtonDown" Handler="s_PreviewMouseLeftButtonDown" />
<EventSetter Event="ListBoxItem.Drop" Handler="listbox_Drop"/>
</Style>
</Grid.Resources>
<Grid Name="Grid01">
<Grid.Resources>
<CollectionViewSource x:Key="cvsSystems" Source="{StaticResource NameListData}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Type"/>
<scm:SortDescription PropertyName="Name"/>
</CollectionViewSource.SortDescriptions>
<CollectionViewSource.GroupDescriptions>
<dat:PropertyGroupDescription PropertyName="Type"/>
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Grid.Resources>
<ListBox ItemsSource="{Binding Source={StaticResource cvsSystems}}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True" HorizontalAlignment="Left" x:Name="ListBox1" Width="160" ItemContainerStyle="{DynamicResource ListBoxItemStyle1}" Margin="0,0,0,0">
<ListBox.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander Header="{Binding Name}" IsExpanded="True">
<ItemsPresenter />
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ListBox.GroupStyle>
</ListBox>
</Grid>
<Grid Name="Grid02">
<Grid.Resources>
<CollectionViewSource x:Key="cvsPreferences" Source="{StaticResource PreferenceListData}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Type"/>
<scm:SortDescription PropertyName="Name"/>
</CollectionViewSource.SortDescriptions>
<CollectionViewSource.GroupDescriptions>
<dat:PropertyGroupDescription PropertyName="Type"/>
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Grid.Resources>
<ListBox ItemsSource="{Binding Source={StaticResource cvsPreferences}}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True" HorizontalAlignment="Left" x:Name="ListBox2" Width="160" ItemContainerStyle="{DynamicResource ListBoxItemStyle2}" Margin="170,0,0,0"/>
<Button Content="Save" Height="23" HorizontalAlignment="Left" Margin="385,320,0,0" Name="Button1" VerticalAlignment="Top" Width="75" />
</Grid>

</Grid>
</Window>
VB
Imports System.Collections.ObjectModel
Imports System.Xml
Imports System.IO
Class MainWindow
Private Sub MainWindow_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
End Sub
Private Sub s_PreviewMouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
If TypeOf sender Is ListBoxItem Then
Dim draggedItem As ListBoxItem = TryCast(sender, ListBoxItem)
DragDrop.DoDragDrop(draggedItem, draggedItem.DataContext, DragDropEffects.Copy)
draggedItem.IsSelected = True
End If
End Sub
Private Sub ListBox2_Drop(ByVal sender As System.Object, ByVal e As System.Windows.DragEventArgs) Handles ListBox2.Drop
Dim _class As SystemName = DirectCast(e.Data.GetData(GetType(SystemName)), SystemName)
If _class IsNot Nothing Then
Dim lcv As ListCollectionView = DirectCast(ListBox2.ItemsSource, ListCollectionView) '?
End If
End Sub
Private Sub listbox_Drop(ByVal sender As Object, ByVal e As DragEventArgs)
End Sub
End Class
Public Class NameList
Inherits ObservableCollection(Of SystemName)
' Methods
Public Sub New()
Dim sysdata As XmlDocument = New XmlDocument()
sysdata.Load(System.AppDomain.CurrentDomain.BaseDirectory & "Systems.xml")
Dim root As XmlElement = sysdata.DocumentElement
Dim nodes As XmlNodeList = root.SelectNodes("System")
For Each node As XmlNode In nodes
Dim tyype As String = node.Attributes("Type").Value
MyBase.Add(New SystemName(tyype, node("Name").InnerText, node("Detail").InnerText))
Next
End Sub
End Class
Public Class PreferenceList
Inherits ObservableCollection(Of SystemName)
' Methods
Public Sub New()
Dim sysdata As XmlDocument = New XmlDocument()
sysdata.Load(System.AppDomain.CurrentDomain.BaseDirectory & "Preferences.xml")
Dim root As XmlElement = sysdata.DocumentElement
Dim nodes As XmlNodeList = root.SelectNodes("System")
For Each node As XmlNode In nodes
Dim tyype As String = node.Attributes("Type").Value
MyBase.Add(New SystemName(tyype, node("Name").InnerText, node("Detail").InnerText))
Next
End Sub
End Class
Public Class SystemName
' Fields
Private _type As String
Private _name As String
Private _detail As String
' Methods
Public Sub New(ByVal type As String, ByVal name As String, ByVal detail As String)
Me._type = type
Me._name = name
Me._detail = detail
End Sub
' Properties
Public Property Type() As String
Get
Return Me._type
End Get
Set(ByVal value As String)
Me._type = value
End Set
End Property
Public Property Name() As String
Get
Return Me._name
End Get
Set(ByVal value As String)
Me._name = value
End Set
End Property
Public Property Detail() As String
Get
Return Me._detail
End Get
Set(ByVal value As String)
Me._detail = value
End Set
End Property
End Class
'Systems.xml' file
<?xml version="1.0" encoding="utf-8"?>
<Systems>
<System Type="TypeA">
<Name>NameA1</Name>
<Detail>This is the detail for NameA1</Detail>
</System>
<System Type="TypeB">
<Name>NameB1</Name>
<Detail>This is the detail for NameB1</Detail>
</System>
<System Type="TypeC">
<Name>NameC1</Name>
<Detail>This is the detail for NameC1</Detail>
</System>
<System Type="TypeA">
<Name>NameA2</Name>
<Detail>This is the detail for NameA2</Detail>
</System>
<System Type="TypeB">
<Name>NameB2</Name>
<Detail>This is the detail for NameB2</Detail>
</System>
<System Type="TypeC">
<Name>NameC2</Name>
<Detail>This is the detail for NameC2</Detail>
</System>
<System Type="TypeA">
<Name>NameA3</Name>
<Detail>This is the detail for NameA3</Detail>
</System>
<System Type="TypeB">
<Name>NameB3</Name>
<Detail>This is the detail for NameB3</Detail>
</System>
<System Type="TypeC">
<Name>NameC3</Name>
<Detail>This is the detail for NameC3</Detail>
</System>
</Systems>
'Preferences.xml' file
<?xml version="1.0" encoding="utf-8"?>
<Systems>
<System Type="TypeA">
<Name>NameA1</Name>
<Detail>This is the detail for NameA1</Detail>
</System>
<System Type="TypeC">
<Name>NameC3</Name>
<Detail>This is the detail for NameC3</Detail>
</System>
</Systems>

Binding not firing

I am writing a Universal app. I have a dto (MobileProject) that has several properties, one of which is ShortName.
In my ViewModel, I have a property (SelectedProject) to hold which item is bound to the SelectedItem in the ComboBox.
        private MobileProject _selectedProject;
        [RestorableState]
        public MobileProject SelectedProject
            get { return _selectedProject; }
            set
                if (value != null)
                    CanSave = (!string.IsNullOrEmpty(value.ShortName));
                SetProperty(ref _selectedProject, value);
        <ComboBox x:Uid="ProjectList"
                      Header="Projects"
                      PlaceholderText="select a project"
                      ItemsSource="{Binding Source={StaticResource lvProjects}}"
                      SelectedItem="{Binding SelectedProject, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                      DisplayMemberPath="ShortName" />
        <TextBox x:Uid="ProjectName"
                     Header="Project Name"
                     PlaceholderText="required"
                     Text="{Binding SelectedProject.ShortName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
My ComboBox happily lists all my projects, and when I select one, the textbox is updated. However, when I overwrite the text in the TextBox,
the SelectedProject property is not being notified in the ViewModel of the text change, so CanSave is not being set via SelectedProject, therefore my
button which is bound to the CanSave property never gets enabled when I type a ShortName. As far as I can see, everything looks fine.
If I override the CanSave so the button is enabled, when I click the button and check the selectedProject properties, the ShortName reflects my changes.
How can I get the SelectedProject property to fire when I'm typing my changes into the TextBox?

Thanks for your code, however I think you post the question in a incorrect forum, this is Windows Store app forum instead of a WPF forum. Actually there are some difference between WPF and Windows Store App on XAML, I'm afraid I may give you wrong
direction.
If you would like to get more sufficient suggestion, you can post a new question at
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=wpf
--James
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Error Binding DatePicker control Date property

I am building a Universal App and am getting a run time error on my DatePicker control when trying to bind the Date property.
I have this in my XAML:
<DatePicker x:Uid="StartDate" Header="Start Date" Date="{Binding StartDateUtc, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
I am binding it to a DateTime property called StartDateUtc. However when firing up the app, I am getting this error:
Exception = {"The text associated with this error code could not be found.\r\n\r\nFailed to assign to property '%0'. [Line: 42 Position: 63]"}
Position 63 happens to be the Date Property. If I remove it, the control is displayed.

Hi Craig,
>> I'm not sure a whole project is needed. Here's the XAML
I failed to reproduce your issue “Failed to assign to property”. Could you please share a sample project through OneDrive to help us reproduce this issue?
By the way, the type of
DatePicker.Date property is DateTimeOffset rather than DateTime. Please try the ViewModel as following and let me know if it makes any difference.
public class CustomViewModel : INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
private DateTimeOffset _startDateUtc;
[RestorableState]
public DateTimeOffset StartDateUtc
get
return this._startDateUtc;
set
if (value != this._startDateUtc)
this._startDateUtc = value;
NotifyPropertyChanged();
Regards,
Jeffrey
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WPF Legend Binded to Graph.

Hi,
I have a ni:Legend object binded to the Plots of my Graph object. Which Property of my Plot should I set from the C# code to see it displayed in the Legend window?
   <ni:Legend Name="MyLegend" ItemsSource="{Binding ElementName=MyGraph, Path=Plots}" />
        <ni:Graph Name="MyGraph" DataSource="{Binding UpdateSourceTrigger=PropertyChanged}">
            <ni:Graph.Plots>
                <ni:Plot/>
            </ni:Graph.Plots>
</ni:Graph>
MyGraph.Plots[0].??? = ???
Solved!
Go to Solution.

The legend uses a WPF ContentPresenter to display the plot Label property. In the case of UI elements, it appears that ContentPresenter defaults to using the ToString representation, instead of the element itself.
To display content like "Something", you will want to assign that content directly to the plot Label property:
    MyGraph.Plots[0].Label = "Something";
If you want to specifically show a WPF Label content control in the legend, you can use the LabelTemplate property:
    <ni:Graph.Plots>
        <ni:Plot>
            <ni:Plot.LabelTemplate>
                <DataTemplate>
                    <Label Content="{Binding}" />
                </DataTemplate>
            </ni:Plot.LabelTemplate>
        </ni:Plot>
    </ni:Graph.Plots>
~ Paul H

Bind WPF grid to non-observable collection

Hello,
I have an object of MyClass, returned by business tier.
MyClass has a property of type List, say
class MyClass
public string Name;
public List<Whatever> Items;
I want to bind that collection of Items to grid in WPF screen with two-way updates using MVVM.
If I bind List<Whatever> via property, my grid does not reflect any changes to the underlying property b/c List does not support NotifyPropertyChanged.
I create a new Observable Collection from List<Whatever>, bind it to grid and it works fine. But now I have 2 instances of the same data in memory, one as List<Whatever> and one as ObservableCollection<Whatever>.
Now, if I make changes to ObservableCollection via UI, it gets modified by framework, but I have to manually update List object with the same changes to keep them in sync, b/c after user is done with changes and wants to save modified MyClass, I need
to make sure MyClass.Items has all the user's changes.
My question is - isn't there a better way handle this situation than copying List to ObservableCollection and back?
Can I bind List property directly to Grid and still have two-way updates out of box? Any suggestions?
Thank you!
Isolda

Thanks for your replies. I did make public List<Whatever> Items into a property in my ViewModel, so that ViewModel looks like this
class MyViewModel : INotifyPropertyChanged
    private MyClass _myClass = new MyClass();
    public string Name { get { return _myCLass.Name; } set{ _myClass.Name = value; }}
    public List<Whatever> Items { get { return _myClass.Items; } set { _myClass.Items = value;}}
XAML is this
<telerik:RadGridView ItemsSource="{Binding Items, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" />
Whenever I add items, I call NotifyPropertyChange("Items").
Grid does not reflect changes to the List, unless I do something to the grid, like click to Sort the column.
The second comment about changes to Whatever objects in the list - "Whatever" is a DTO object, really don't want to add any code to it... I think I'll just stick to copying from List to Observable collection and back, although I'm concerned
about 2 times more memory.
If I misunderstood your replies pls let me know what I'm missing.
Thanks.
Isolda

Awesome WM and Double Clicking

Hello all,
I am having trouble determining what is the appropriate way to bind a double-click in rc.lua. I don't have trouble binding a single right or left click so I know the code is correct. Any help in this regard is appreciated.
Best regards!

Someone correct me if I'm wrong, but I don't think you can. There's a request for the doubleclick capability:
https://awesome.naquadah.org/bugs/index … ask_id=900

Reproducing Incident Form Elements in a Custom Class

Hello again everyone,
I am trying to rollout a completely separate module in SCSM to record MACD (Move/Add/Change/Delete) requests. I decided to use the OOB incident module as my base class as it already contained many fields I require (I inherited the properties
and relationships) and created a new form assembly in Visual Studio to wire the properties to.
After created the form and labels, I imported the .dll into the Authoring Tool so I can just drag out each property from the MP explorer onto the form. Everything works except for the last few fields which are a bit more complex than a standard list or textbox.
I cannot seem to add the controls for the more complicated items like "Affected Services" or "Affected Items", when I try to drag them out to the form I get an error saying cardinality is not set to 1... I am guessing this is because
its trying to map a relationship between a workitem and a service instead of my custom class and a service...
So I went back into Visual Studio and added a ListView to the form, thinking I will have to wire the data bindings inside the form itself. However, I am stuck as I am not sure where "Services" are being written to, as I will need this location
to reference in my empty ListView. I have provided my code and commented where I believe I am missing logic. Thank you in advance for any help!
Note: "servicerelatestoworkitem" is not actually an object, my logic is conceptual and I still have not found which class/object the list of services is being written to.
C# Code containing button logic (an add button to add a service to the ListView, and a delete button to remove a service from the ListView.
private void add_services_button_Click(object sender, RoutedEventArgs e)
   // Open list of Services here, allow user to pick a service, then add selected service to "servicerelatestoworkitem"
   // AffectedServicesListView is populated from servicerelatestoworkitem
private void del_services_button_Click(object sender, RoutedEventArgs e)
    // Test to see if item is being selected and display selected item to confirm ability to manipulate variable
    try
        var itemSelected = ListView.GetIsSelected(AffectedServicesListView);
        MessageBox.Show(itemSelected.ToString());
    catch (Exception ex)
        MessageBox.Show(ex.Message);
    // Remove selected item from servicerelatestoworkitem and refresh AffectedServicesListView
XAML Code containing the list view and two buttons: (Note: The binding is most likely incorrect, I was just experimenting with it)
<ListView x:Name="AffectedServicesListView" HorizontalAlignment="Left" Height="95" Margin="10,414.6,0,0" VerticalAlignment="Top" Width="521" ItemsSource="{Binding Path=AffectedServicesListView, Mode=Default, UpdateSourceTrigger=PropertyChanged}">
                        <ListView.View>
                            <GridView>
                                <GridViewColumn/>
                            </GridView>
                        </ListView.View>
                    </ListView>
                    <Button x:Name="add_services_button" Content="" HorizontalAlignment="Left" Margin="470.55,382.749,0,0" VerticalAlignment="Top" Width="27.674" Height="26.851" Click="add_services_button_Click" BorderBrush="{x:Null}">
                        <Button.Background>
                            <ImageBrush ImageSource="add.png"/>
                        </Button.Background>
                    </Button>
                    <Button x:Name="del_services_button" Content="" HorizontalAlignment="Left" Margin="503.224,382.749,0,0" VerticalAlignment="Top" Width="27.776" Height="26.851" Click="del_services_button_Click" BorderBrush="{x:Null}">
                        <Button.Background>
                            <ImageBrush ImageSource="delete.png"/>
                        </Button.Background>
                    </Button>

Cardinality is a property of relationships classes, not a property of specific relationships. each type of relationship has it's own cardinality values, but the engine only really recognizes "one" and "many". it makes sense to say that
the "affected user" relationship is many to one, because Each work item can have one and only one affected user, but each users may be the affected user of many work items. The Related work items relationship is a many to many, because each workitem
may be related to many other work items. it doesn't make sense to say this specific relationship between this IR and that user is "many to one", because each instance is only between one specific object and another specific objects. the cardinality
just controls how many of those specific relationships instances can exist for each type of relationship.
There are no out of the box controls for many to many relationships. the Instance Picker control is designed to support one to one and many to one relationships. you'd have to write your own controls for support many to one relationships. Consider Travis
Wright's SR Example for 2010, since most of this code should execute in 2012 and 2012r2 with only minor modifications.
You'd have to either find the control that defines it, like with the history tab, or recreate it using the
authoring tool or
Visual Studio.

WPF Finding Selected ComboBox Item Within DataGrid

Hi all... I'm having an issue trying to access the selected item value in a ComboBox within a DataGridTemplateColumn.
Through another question/answer I have got the ComboBox displaying the names as it should but the next step I'm having issues with is to be able to loop through each row in the DataGrid and determine the selected value of the ComboBox in that row as
well as some other items and run some other code based on those values.
Any help would be appreciated.
Thanks,
Greg
<Grid>
<DataGrid x:Name="gvDefaultCWWSchedule" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,109,10,214" AutoGenerateColumns="False" Grid.Row="0"
AllowDrop="True" IsReadOnly="False" SelectionMode="Single" Background="Beige" CanUserAddRows="False">
<DataGrid.Columns>
<DataGridTemplateColumn Width="150">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox Name="ddlUsers"
ItemsSource="{Binding Path=Users}"
DisplayMemberPath="{Binding Name, Mode=TwoWay}"
SelectedValuePath="{Binding Uid, Mode=TwoWay}"
SelectedIndex="{Binding Uid, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectionChanged="ComboBox_SelectionChanged"
>
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding WeekNumber}" />
</DataGrid.Columns>
</DataGrid>
<Button Content="Button" HorizontalAlignment="Left" Margin="729,32,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
</Grid>
public partial class Test : Window
public Test()
InitializeComponent();
BindDefaultCWWSchedule();
private void BindDefaultCWWSchedule()
// THIS IS COMING FROM MY DB
List<CurrentUser> UsersFinal = new List<CurrentUser>();
UsersFinal.Add(new CurrentUser { Uid = 1, Name = "JOHN" });
UsersFinal.Add(new CurrentUser { Uid = 2, Name = "BILL" });
UsersFinal.Add(new CurrentUser { Uid = 3, Name = "MARY" });
ObservableCollection<CWWDefaultScheduleWeek> DefaultSchedules = new ObservableCollection<CWWDefaultScheduleWeek>();
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 1, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 2, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 3, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 4, SelectedUser = null });
gvDefaultCWWSchedule.ItemsSource = DefaultSchedules;
private void Button_Click(object sender, RoutedEventArgs e)
var rows = gvDefaultCWWSchedule.ItemsSource;
ObservableCollection<CWWDefaultScheduleWeek> CWWSchedAssignments = new ObservableCollection<CWWDefaultScheduleWeek>();
foreach (var row in rows)
CWWDefaultScheduleWeek r = (CWWDefaultScheduleWeek)row;
// FOR EACH ROW HERE I'M WANTING TO CREATE A LIST OF ITEMS AND RUN FURTHER CODE BASED ON IT... ISSUE IS FINDING THE ACTUAL SELECTED USER ON EACH ROW...
CWWSchedAssignments.Add(new CWWDefaultScheduleWeek
Users = r.Users,
SelectedUser = r.SelectedUser,
WeekNumber = r.WeekNumber
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
gvDefaultCWWSchedule.CommitEdit();
public class CWWDefaultScheduleWeek
public IEnumerable<CurrentUser> Users { get; set; }
public CurrentUser SelectedUser { get; set; }
public int WeekNumber { get; set; }
public class CurrentUser
public int Uid { get; set; }
public string Name { get; set; }

In a way, wpf is similar to web.
More so than windows forms anyhow.
XAML is mark up and flows like html.
You have padding and margin which are rather familiar concepts.
Whereas windows forms is absolute positioning and... well totally different from markup.
You might find this sample interesting as a sort of mvvm taster.
https://gallery.technet.microsoft.com/WPF-Dialler-simulator-d782db17
and event handling equivalents
http://social.technet.microsoft.com/wiki/contents/articles/30564.wpf-uneventful-mvvm.aspx
Note
With a combo you bind the selecteditem to a propfull and then you can put a method call in the setter. That will then be invoked when the user changes selection.
Good luck and welcome to wpf development.
It's a great technology.
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML

Binding to double = UpdateSourceTrigger=PropertyChanged.

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