fixed NullReferenceException in FileSystemControl

Author: spiegelp

MaterialDesignExtensions/Controls/FileSystemControl.cs

@@ -399,7 +399,11 @@ public override void OnApplyTemplate()
         protected virtual void LoadedHandler(object sender, RoutedEventArgs args)
         {
             m_controller.PropertyChanged += ControllerPropertyChangedHandler;
-            m_currentDirectoryTextBox.KeyDown += CurrentDirectoryTextBoxKeyDownHandler;
+
+            if (m_currentDirectoryTextBox != null)
+            {
+                m_currentDirectoryTextBox.KeyDown += CurrentDirectoryTextBoxKeyDownHandler;
+            }
 
             // not sure if the control should get keyboard focus on loading
             //Keyboard.Focus(this);
@@ -408,7 +412,11 @@ protected virtual void LoadedHandler(object sender, RoutedEventArgs args)
         protected virtual void UnloadedHandler(object sender, RoutedEventArgs args)
         {
             m_controller.PropertyChanged -= ControllerPropertyChangedHandler;
-            m_currentDirectoryTextBox.KeyDown -= CurrentDirectoryTextBoxKeyDownHandler;
+
+            if (m_currentDirectoryTextBox != null)
+            {
+                m_currentDirectoryTextBox.KeyDown -= CurrentDirectoryTextBoxKeyDownHandler;
+            }
         }
 
         protected void OpenSpecialDirectoriesDrawerCommandHandler(object sender, ExecutedRoutedEventArgs args)
@@ -424,7 +432,7 @@ protected void SwitchPathPartsAsButtonsHandler(object sender, ExecutedRoutedEven
 
         private void CurrentDirectoryTextBoxKeyDownHandler(object sender, KeyEventArgs args)
         {
-            if (args.Key == Key.Enter)
+            if (sender == m_currentDirectoryTextBox && args.Key == Key.Enter)
             {
                 string directory = m_currentDirectoryTextBox.Text
                     .Replace("\n", string.Empty)
@@ -541,7 +549,11 @@ protected virtual void CurrentDirectoryChangedHandler(string newCurrentDirectory
             try
             {
                 m_controller.SelectDirectory(newCurrentDirectory);
-                m_currentDirectoryTextBox.Text = newCurrentDirectory;
+
+                if (m_currentDirectoryTextBox != null)
+                {
+                    m_currentDirectoryTextBox.Text = newCurrentDirectory;
+                }
             }
             catch (PathTooLongException)
             {

ReleaseNotes.md

@@ -197,3 +197,4 @@ Please change your configuration according to [App.xaml](https://github.com/spie
 #### Fixes
 * Fixed reflection code in `ResourceDictionaryExtensions`
 * Fixed usage of `SecondaryHueMidBrush` and `SecondaryHueMidForegroundBrush` resources
+* Fixed `NullReferenceException` in `FileSystemControl`

docs/snippets/releasenotes.html

@@ -32,6 +32,8 @@ <h3>Features</h3>
     <h3>Fixes</h3>
     <ul>
         <li>Fixed reflection code in <code>ResourceDictionaryExtensions</code></li>
+        <li>Fixed usage of <code>SecondaryHueMidBrush</code> and <code>SecondaryHueMidForegroundBrush</code> resources</li>
+        <li>Fixed <code>NullReferenceException</code> in <code>FileSystemControl</code></li>
     </ul>
     <h2>v3.2.0</h2>
     <h3>Features</h3>
@@ -54,7 +56,6 @@ <h3>Features</h3>
     <h3>Fixes</h3>
     <ul>
         <li>Fixed exception in <code>Stepper</code> events</li>
-        <li>Fixed usage of <code>SecondaryHueMidBrush</code> and <code>SecondaryHueMidForegroundBrush</code> resources</li>
     </ul>
     <h2>v3.1.0</h2>
     <h3>Features</h3>