Action<object, EventArgs> could not be cast to EventHandler?

Question

I was wiring up an event to use a lambda which needed to remove itself after triggering. I couldn\'t do it by inlining the lambda to the += event (no accessable variable to

Answer 1

In general, delegates can't be cast because they have no inheritance tree defining which casts are valid. To that end, you have two choices:

1. Use a variable of type EventHandler instead of the Action

2. Use an inline declaration.

   // option 1: local variable
   EventHandler eh = (o, ea) => { /* [snip] */ };
   obj.event += eh;
   obj.event -= eh;
   
   // option 2: inline declaration
   obj.event += (o, ea) => { /* [snip] */ };