Hi Sally,
Just to make this issue clearly, which kind of app did you really developing?
>>Cannot convert lambda expression to type 'Delegate' because it is not a delegate type.
Like the following similar issues:
http://stackoverflow.com/questions/9549358/cannot-convert-lambda-expression-to-type-system-delegate
http://stackoverflow.com/questions/31899067/cannot-convert-lambda-expression-to-type-delegate-because-it-is-not-a-delegate
Maybe you can use Action.
pbProcessed.Invoke(new Action(() => { }));
Best Regards,
Jack
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