Regarding udione's solution for WebBrowser memory leak

This code was asked by udione in response to a longstanding question about memory leaks in the WebBrowser control in .Net .

//dispose to clear most of the references 

//using reflection to remove one reference that was not removed with the dispose  
var field = typeof(System.Windows.Window).GetField("_swh", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); 

var valueSwh = field.GetValue(mainwindow); 

var valueSourceWindow = valueSwh.GetType().GetField("_sourceWindow", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(valueSwh); 

var valuekeyboardInput = valueSourceWindow.GetType().GetField("_keyboardInputSinkChildren", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(valueSourceWindow); 

System.Collections.IList ilist = valuekeyboardInput as System.Collections.IList; 

    for (int i = ilist.Count-1; i >= 0; i--) 
        var entry = ilist[i]; 
        var sinkObject = entry.GetType().GetField("_sink", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); 
        if (object.ReferenceEquals(sinkObject.GetValue(entry), this.webbrowser.webBrowser)) 


1) Third line,



won't compile for me. What is the type this.webbrowser

? I assumed it was WebBrowser

, but this method requires System.Windows.DependencyObject


2) In line

var valueSwh = field.GetValue(mainwindow);


what is it mainwindow

? Form containing browser control?

3) In the sixth line from the bottom

if (object.ReferenceEquals(sinkObject.GetValue(entry), this.webbrowser.webBrowser))  


what is the type this.webbrowser.webBrowser

? I don't see the type field WebBrowser

in the type WebBrowser

. Is this just a typo?

Thanks for any help.


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1 answer

 var mainwindow = GetWindow(this);


3. this.webbrowser

is the id of the WPF control ( FrameworkElement.Name

). By default, this is normal webbrowser1




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