Breaks when clicking on names in a ListView

Question

So as the title suggests, I am having trouble when I select an item in a list view. If I click on the name of the item in the list, the program will break giving the following error/reason: 
An unhandled exception of type 'System.InvalidCastException' occurred in PresentationFramework.dll
Additional information: Unable to cast object of type 'System.Windows.Controls.ContentPresenter' to type 'System.Windows.Controls.Panel'.
If I click anywhere else on the line the item is on it will select the item just fine.
Another issue I am having is that when I try to check if the item is a directory after it is selected the program will break giving the following exception:
An unhandled exception of type 'System.NullReferenceException' occurred in Information.exe
Additional information: Object reference not set to an instance of an object.
Code:
private void ExploreDirectories2(TreeViewItem item)
var directoryInfo = (DirectoryInfo)null;
if (item.Tag is DriveInfo)
directoryInfo = ((DriveInfo)item.Tag).RootDirectory;
else if (item.Tag is DirectoryInfo)
directoryInfo = (DirectoryInfo)item.Tag;
else if (item.Tag is FileInfo)
directoryInfo = ((FileInfo)item.Tag).Directory;
if (object.ReferenceEquals(directoryInfo, null)) return;
try
foreach (var directory in directoryInfo.GetDirectories())
var isHidden = (directory.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden;
var isSystem = (directory.Attributes & FileAttributes.System) == FileAttributes.System;
if (!isHidden && !isSystem)
expanded_directory.Items.Add(this.GetItem(directory));
catch (IOException)
verify1 = false;
private void ExploreFiles2(TreeViewItem item)
var directoryInfo = (DirectoryInfo)null;
if (item.Tag is DriveInfo)
directoryInfo = ((DriveInfo)item.Tag).RootDirectory;
else if (item.Tag is DirectoryInfo)
directoryInfo = (DirectoryInfo)item.Tag;
else if (item.Tag is FileInfo)
directoryInfo = ((FileInfo)item.Tag).Directory;
if (object.ReferenceEquals(directoryInfo, null)) return;
try
foreach (var file in directoryInfo.GetFiles())
var isHidden = (file.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden;
var isSystem = (file.Attributes & FileAttributes.System) == FileAttributes.System;
if (!isHidden && !isSystem)
expanded_directory.Items.Add(this.GetItem(file));
catch (IOException)
verify2 = false;
private void directory_tree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
expanded_directory.Items.Clear();
var tree = (TreeView)sender;
var selected = (TreeViewItem)tree.SelectedItem;
selected.BringIntoView();
ExploreDirectories2(selected);
ExploreFiles2(selected);
private void expanded_directory_SelectionChanged(object sender, SelectionChangedEventArgs e)
try
var list = (ListView)sender;
var selected = (TreeViewItem)list.SelectedItem;
if (selected.Tag is DirectoryInfo)
if (selected.IsExpanded)
list.SelectedIndex = -1;
catch(InvalidCastException)
private void expanded_directory_MouseDoubleClick(object sender, MouseButtonEventArgs e)
var list = (ListView)sender;
var item = (TreeViewItem)list.SelectedItem;
if (item.Tag is DirectoryInfo)
expanded_directory.Items.Clear();
ExploreDirectories2(item);
ExploreFiles2(item);
If you would like to view the entire program you can download it here:  
https://drive.google.com/file/d/0B2h5hXOyNkgfWjU4emlVNlo3ZWc/view?usp=sharing
If you do download it, you may need to comment out the if statement in expanded_directory_SelectionChanged function. That is the one that won't let me check if the item is a directory.
Let me know if you need anything!
Thanks,
Jesse

Answer 1

Please close your previous threads by marking helpful posts as answer before you start a new one.
You seem to adding TreeViewItems directly to a ListView without an ItemTemplate and this doesn't seem to work very well as the exception is thrown from the framework code and not your code.
Why don't you just replace the ListView with a TreeView in FileExplorer?
<TreeView x:Name="expanded_directory" HorizontalAlignment="Left" Height="521" Margin="155,28,0,0"
SelectedItemChanged="expanded_directory_SelectionChanged" MouseDoubleClick="expanded_directory_MouseDoubleClick"
VerticalAlignment="Top" Width="777" Background="#FF2D2D30" BorderBrush="#FF2D2D30" Foreground="#FF0066CC" FontFamily="Microsoft Sans Serif" FontWeight="Bold"/>
private void expanded_directory_MouseDoubleClick(object sender, MouseButtonEventArgs e)
var list = (TreeView)sender;
var item = (TreeViewItem)list.SelectedItem;
if (item.Tag is DirectoryInfo)
expanded_directory.Items.Clear();
ExploreDirectories2(item);
ExploreFiles2(item);
private void expanded_directory_SelectionChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
try
var list = (TreeView)sender;
if (list != null)
var selected = (TreeViewItem)list.SelectedItem;
if (selected != null)
if (selected.Tag is DirectoryInfo)
if (selected.IsExpanded)
selected.IsSelected = false;
list.Focus();
catch (InvalidCastException)
That should solve the problem. You may have to make some additional slight modifications to your code other than the ones listed above but the key here is to replace the ListView with a TreeView.
Hope that helps.
Please remember to close your threads by marking helpful posts as answer and please start a new thread if you have a new question.