StringFormat for DataGridTextColumn

I have spent an hour trying to do the simplest thing, which of course is never the case with WPF...
I am binding a property of type TimeSpan to a column in a grid. Without any formatting it works, except I don't like the format. I want a single digit for 10ths of seconds (e.g. "2:45:19.7"). I'm currently doing this:
<DataGridTextColumn Header="{res:Res Id=PERIOD,Default=Period::}"
Width="Auto"
IsReadOnly="True"
Binding="{Binding TimePeriod, StringFormat={}{0:hh:mm:ss.f}}" />
When I run this, the column is blank. I tried using single quotes around the '{}{0:hh:mm:ss.f}'. I tried escaping the ":" in the string, like this: {0:hh\:mm\:ss\.f}. None work - I see a blank column. Do I need the first
"{}"? What's that do. Where is any of this explained?
This is so ridiculous. I want to do the simplest thing but WPF makes it so difficult.

Forget the fact there's a textblock involved in my markup ( I don't have a convenient datagrid to hand ).
It's just an example of how the stringformat works.
Substitute
StringFormat={}{0:hh\\:mm\\:ss\\:f}
for your
StringFormat={}{0:hh:mm:ss.f}
I just wrote an explanation of timespan stringformat here:
http://social.technet.microsoft.com/wiki/contents/articles/30609.wpf-tips-stringformat-on-timespan.aspx
Hope that helps.
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[WPF] Format column text for showing percentage

Hi,
in one column of my DataGrid I show percentage values.
From database, I get the number:
- in view, I would concatenate the char "%"
- in edit, the user add his value and when mouse leaves cell automatically is concatenated the char "%"
How can I implement it?
Thanks.

Replace any DataGridTextColumn with a DataGridTemplateColumn and specify a StringFormat for the TextBlock in the CellTemplate only:
<DataGrid.Columns>

<DataGridTemplateColumn>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Val, StringFormat='\{0\}%'}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding Val}"/>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
Note that the "number" source property must be an int, double, decimal etc. for the StringFormat to get applied.
Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question.

WPF Data gird double value in cell round up automatically

Hi All,
I have one datagrid where one of the columns contains double values. I placed limitations on length and decimal part. Decimal part is always comes with 2 digits. Now during editing the cell that holds double value in DataGrid , if I enter value of
99.99 then it is becoming 100. At this moment the cell is still under edit mode.
If the columns hold decimal type values then this automatic round up is not happening. But due to some constraints , at this moment we can't change the columns type from double to decimal. So I just want to disable the auto round up with double
values in DataGrid. I searched in MSDN forums but did not find any , tried adding StringFormat for columns. But it did not help.
I tested by keeping the double value outside of the DataGrid ( in editbox ) , I don't see any automatic round up. So I suspect there could be something with DataGrid that is resulting automatic round up.
Is there any way to disable this automatic round op on double values in DataGrid? I welcome your comment.
Thanks,
Brahmaji.

Well, 99.99 as you mentioned in your original post is not the same value as 9999999999999999. You cannot store the value 9999999999999999 in a double field.
You could change the type to decimal to be able to store values with a higher precision:
public class Movie
public string Title { get; set; }
public int Year { get; set; }
public string Director { get; set; }
public bool Hit { get; set; }
public decimal Price { get; set; }
new Movie()
Title = "The Lawnmower Man",
Year = 1992,
Director = "Brett Leonard",
Hit = true,
Price = 22.23M
If you want to prevent the value of the source property from getting set when an invalid double value is entered you could implement your own ValidationRule:
namespace SampleGrid
class MyValidationRule : System.Windows.Controls.ValidationRule
public override System.Windows.Controls.ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
string s = value.ToString();
double d;
if(double.TryParse(s, out d))
return new System.Windows.Controls.ValidationResult(false, "invalid value");
return System.Windows.Controls.ValidationResult.ValidResult;
<DataGridTemplateColumn Header="Price">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Price, StringFormat=##.00}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate xmlns:local="clr-namespace:SampleGrid">
<TextBox>
<TextBox.Text>
<Binding Path="Price" StringFormat="##.00">
<Binding.ValidationRules>
<local:MyValidationRule ValidationStep="RawProposedValue"/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

Then the value won't get rounded. Of course you can still not set the double source property to 9999999999999999 though.
There is no property that you can set on the DataGrid to prevent the value from getting rounded.
Hope that helps.
Please remember to helpful posts as answer to close the thread and then start a new thread if you have a new question.

TextBlock does not aligns to right in DataGridTemplateColumn

Hello guys here:
I am currently running into a nasty issue. What I wanna achieve is to put two text blocks horizontally in a DataGridTemplateColumn and I wanna align the right text block text to the right. Here is my code:
<DataGrid ItemsSource="{Binding Path=DVHParameters}"
AutoGenerateColumns="False"
CanUserResizeColumns="False"
CanUserSortColumns="False"
CanUserReorderColumns="False"
CanUserResizeRows="False"
CanUserAddRows="False"
CanUserDeleteRows="False"
IsHitTestVisible="False"
Visibility="{Binding DVHParametersVisibility}"
Margin="0,0,0,8"
Background="Transparent">
<DataGrid.Columns>
<DataGridTemplateColumn Header=" ">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Stretch"
>
<TextBlock Text="{Binding Parameter}" HorizontalAlignment="Left"/>
<TextBlock Margin="1,0,0,0" Foreground="Gray" Text="{Binding
ValueUnit}"
HorizontalAlignment="Stretch" TextAlignment="Right"/>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="{x:Static local:TextResources.Prescribed}"
Binding="{Binding Prescribed}"/>
<DataGridTextColumn Header="{x:Static local:TextResources.Actual}"
Binding="{Binding Actual, StringFormat=F1}">
<DataGridTextColumn.CellStyle>
<Style TargetType="DataGridCell" BasedOn="{StaticResource DataGridCellStyle}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsConformObjective}" Value="false">
<Setter Property="Foreground" Value="Red"/>
<Setter Property="FontWeight" Value="Bold"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGridTextColumn.CellStyle>
</DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
Any hints on how to fix this problem and control the width of the textblock in a DataGridTemplateColumn? Thanks in advance!
Best regards

I suggest you consider dockpanel because I think you can dock one textblock left and one right.
Horzontalalignment stretch tries to stretch it to fit the container, don't use that.
Bear in mind though that you could conceivably end up with one on top of the other if they don't fit.
A grid with 2 columns might be safer.
That'd look roughly like
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<toolkit:DockPanel >
<TextBlock .... toolkit:DockPanel.Dock="Left"/>
<TextBlock .... toolkit:DockPanel.Dock="Right"/>
</StackPanel>
</DataTemplate>
You need a reference and xmlns
xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"
or
xmlns:toolkit="clr-namespace:Microsoft.Windows.Controls;assembly=Microsoft.Windows.Controls"
Hope that helps.
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Datagrid: Can I set a tranparency level for column background color?

Hi all,
I have a datagrid with background colors set using triggers. This works. I would like to set a column background color but I don't want to make the color solid because it will block the row color. Is there a way to set the column background color transparency
to 50% (or less) so that I can still see (or blend) with the row background color? I can set the "background" property of the column to a value of "transparent" but this makes no sense without a color.
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<Style.Triggers>
<DataTrigger Binding="{Binding col_oPutorCall}" Value="call">
<Setter Property="Background" Value="Cornsilk"/>
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</Style>
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<DataGridTextColumn Binding="{Binding col_oBid, StringFormat=F2}" FontFamily="Arial" FontWeight="Bold" FontSize="12" Header="oB" >
<DataGridTextColumn.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="Background" Value= "Transparent" />
<Setter Property="Background" Value= "AliceBlue" />
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</DataGridTextColumn.CellStyle>
</DataGridTextColumn>

Background is a brush.
You can define a brush with an opacity in a resourcedictionary merged in app.xaml or in your window.resources ( etc ).
<Grid.Resources>
<SolidColorBrush x:Key="TransparentIshBrush" Color="Red" Opacity=".3" />
</Grid.Resources>
I should think you can then do:
<DataGridTextColumn Binding="{Binding col_oBid, StringFormat=F2}" FontFamily="Arial" FontWeight="Bold" FontSize="12" Header="oB" >
<DataGridTextColumn.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="Background" Value="{StaticResource TransparentIshBrush}" />
</Style>
</DataGridTextColumn.CellStyle>
</DataGridTextColumn>
The problem with your former piece of code is that setting an opacity on a datagridcell gets everything in it. You would have to do
<Setter Property="(BackGround.Opacity)"
And I'm rather doubtful that would work anyhow.
Please don't forget to upvote posts which you like and mark those which answer your question.
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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}"/>
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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.

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There was a similar question a while ago.
IIRC the conclusion was you have to delay the raising of property changed.
Assuming this is the same sort of thing.
Very slightly will do.
Storyboard sb = new Storyboard();
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StringFormat for DataGridTextColumn

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