Why getting error exception Managed Debugging Assistant 'FatalExecutionEngineError' : 'The runtime has encountered a fatal error and how to fix it ?

Question

Tried to google for answer but didn't find something that work or a clean solution.

I'm using visual studio 2022 community. Windows 10 pro.

The project is wpf type.

Sometimes it happens in the code on this line :

string StringFromRichTextBox(System.Windows.Controls.RichTextBox rtb)  
        {  
            TextRange textRange = new TextRange(  
                rtb.Document.ContentStart,  
                rtb.Document.ContentEnd  
            );  
  
            return textRange.Text;  
        }  

On the line :

return textRange.Text;  

Answer 1

I think that there are certain reasons to try this fix of '+=' operations:

fsw.Changed += ( s, a ) => Dispatcher.Invoke( ( ) => Fsw_Changed( s, a ) );  
fsw.Created += ( s, a ) => Dispatcher.Invoke( ( ) => Fsw_Created( s, a ) );  
fsw.Deleted += ( s, a ) => Dispatcher.Invoke( ( ) => Fsw_Deleted( s, a ) );  
fsw.Renamed += ( s, a ) => Dispatcher.Invoke( ( ) => Fsw_Renamed( s, a ) );  

Or, instead of these changes, try a shorter fix:

fsw.SynchronizingObject = this;