How do I deregister my Lambda callback?

Question

If I create a lambda callback such as this:

var someInstance = new SomeObject();

someInstance.Finished += (obj, args) =>
{
      // Do something

      // Deregister here
};

someInstance.DoAction();

How could I deregister the callback as part of the actual handler code? This pattern would be ideal as I could ensure it is released as soon as possible.

I've seen similar questions but not one where this type of example is directly addressed.

Answer 1

With something like,

var someInstance = new SomeObject();

EventHandler myDelegate = null;
myDelegate = (obj, args) =>
{
      // Do something

      // Deregister here
      someInstance.Finished -= myDelegate;
};
someInstance.Finished += myDelegate;

someInstance.DoAction();