.net - Check for event listener(vb) for an event raised in C# -


for c# collectionchanged event, how 1 define vb event handler?

for c# code snippet, expression collectionchanged != null evaluates false indicating vb event handler has not being defined correctly or might missing basic.

 public event collectionchangeeventhandler collectionchanged;  protected virtual void oncollectionchanged(collectionchangeaction action, expression  element)  {      if (collectionchanged != null) //always null      {          collectionchangeeventargs e = new collectionchangeeventargs(action, element);          collectionchanged(this, e);      }  }  // usage: oncollectionchanged(collectionchangeaction.refresh, item);

the vb event handler defined below:

addhandler expression.expressionscollection.collectionchanged, addressof expressionscollectionupdated


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