System Reflection TargetInvocationException occurred in PresentationFramework dll

Question

Okay  I have a bit of a weird bug     This works fine   private void radioButtonNormalPoint Checked object sender  RoutedEventArgs e         comboBoxNormalPoint SelectedIndex   0       ellipsePoint Fill   System Windows Media Brushes Black      This throws System Reflection TargetInvocationException   private void radioButtonNormalPoint Checked object sender  RoutedEventArgs e       comboBoxNormalPoint SelectedIndex   0     ellipsePoint Fill   System Windows Media Brushes Black      Also  it doesn t let me debug it  it crashes as the program loads  If I put a breakpoint anywhere it doesn t hit it  it just errors right away

User · Answer

I think you will have fewer problems if you declared a Property that implements INotifyPropertyChanged  then databind IsChecked  SelectedIndex using IValueConverter  and Fill using IValueConverter  to it instead of using the Checked Event to toggle SelectedIndex and Fill

User · Answer

The event is probably raised before the elements are fully loaded or the references are still unset  hence the exceptions  Try only setting properties if the reference is not null and IsLoaded is true

User · Answer

To diagnose this issue  place the line of code causing the TargetInvocationException inside the try block   To troubleshoot this type of error  get the inner exception   It could be due to a number of different issues   try          code causing TargetInvocationException   catch  Exception e        if  e InnerException    null            string err   e InnerException Message

User · Answer

This is often caused by an attempt to process a null object  An example  trying to empty a Bindable list that is null will trigger the exception   public class MyViewModel        BindableProperty      public virtual IList lt Products gt  ProductsList  get  set         public MyViewModel                  ProductsList Clear       here is the problem           This could easily be fixed by checking for null   if  ProductsList   null  ProductsList Clear

User · Answer

If the radiobutton-checked event occurs before the content of the window is loaded fully  i e  the ellipse is loaded fully  such an exception will be thrown  So check if the UI of the window is loaded  probably by Window ContentRendered event  etc

[c#] 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

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