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PODoes MouseLeftButtonDown sender object really not pass a referance to object that triggered it? c# Silverlight
 

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  1. PODoes MouseLeftButtonDown sender object really not pass a referance to object that triggered it? c# Silverlight
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    <p>I recently created a Silverlight 3 app in which I created some UI elements in the code behind and added them at run-time dynamically.</p> <p>I was hoping to just use the built-in MouseButtonEventArgs or the sender object to get a reference to the instance that was clicked, however I noticed once I started that this was not the case. I was not able to access any properties of the object that triggered the event and program against it.</p> <pre><code> void myFunc(object sender, MouseButtonEventArgs e) { //Can't do this :( sender.someProperty = someValueToUpdate; //or this MyClass foo = sender as MyClass; foo.someProperty = someValueToUpdate; } </code></pre> <p>I ended up just writing a CustomEventArgs object to pass an instance, but it surprised me that this wasn't a default behavior.</p> <p><strong>Can anyone shed some light as to WHY the sender object doesn't contain a reference to the object that triggered the event?</strong> </p> <p>Also, here is what I did to get that instance.</p> <pre><code>myObject.myEvent += new CustomEvent(myFunc); ... void myFunc(object sender, CustomEventArgs e) { e.MyProperty = someValueToUpdate; } ... public class MyClass { public MyProperty = 0; public event CustomEvent myEvent; protected virtual void MyEventMethod(CustomEventArgs e) { if (myEvent != null){myEvent(this, e);} } public MyClass () { this.MouseLeftButtonDown += new MouseButtonEventHandler(this_MouseLeftButtonDown); } void rect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { CustomEventArgs e2 = new CustomEventArgs(this); MyEventMethod(e2); } } public class CustomEventArgs : EventArgs { private readonly MyClass myProperty; public CustomEventArgs(MyClass myProperty) { this.myProperty = myProperty; } public MyClass MyProperty { get { return myProperty; } } } public delegate void CustomEvent(object sender, CustomEventArgs e); </code></pre>
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    1. CODid you attach a debugger and see what value "sender" did have?
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    2. COyes, it is just an object, I can delegate a type with var foo = sender as MyClass; but the updating properties on that object doesn't work.
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