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I am quite new to WPF and rather new to C# and now have inherited a C#/WPF App with over 60k lines of code (no MVVM was used, the design pattern is rather improvised). Now, I have to change a rather small thing in the UI, but this control is quite crucial and therefore heavily woven into the whole solution. I know the "Live Visual Tree" Function in Visual Studio and also I know the Live Property Explorer. However, I would like to have something like a "Live EVENT Explorer" to see what methods are registered to an event of this control. I would like to have something like:

a) A possibility to see, what methods are currently subscribed to a certain event (for example the SelectionChanged event of a ListView). With "currently" I mean, that the subscribed methods are changing quite a lot depending on what radio buttons and check boxes are selected, etc. So I would like to make all the selections I need and then inspect the control and see what methods are subscribed to one of its events.

b) A possibility to stop right in the first method that is being triggered by this event if I for example change the selection in my control. So that I can step through all the following code?

Does anyone of you have an idea if either one of this is possible with a built-in function in Visual Studio and also how to do it? Or is there maybe another tool out there how to achieve something like this?

In most cases, Find All References should have it covered, but this fails when the event is not unique enough (imagine Button.Click).

You can access this in a debugger by browsing to the event object and examining the _invocationList field. If this field is not populated, look at _methodPtr field. If both fields are null, then no one is subscribed.

_target is the object containing the subscribed method. If it is null, a static method is subscribed (which makes identification much more tricky). Otherwise, you can dump the method table of the target object to find the subscribed method.

In Visual studio, the debug tooltips make this easy. For a unicast delegate, hovering over the event shows the declaring type and method name (and arity if needed):

for multicast, the _invocationList takes over:

You can go to the View where the ListView is, and in code-behind, subscribe your self to the ListView.SelectionChanged event and add the following code on the handling of the event:

foreach(EventHandler subscriber in ListView.SelectionChanged.GetInvocationList())

{

        // etc

}

You can get more info from here:

How do I get the subscribers of an event?

I hope that helps you a bit to debug it.