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Home/ Questions/Q 152911
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Asked: May 11, 20262026-05-11T09:42:27+00:00 2026-05-11T09:42:27+00:00

I see this line in many online examples of using the Action delegate: public

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I see this line in many online examples of using the Action delegate:

public event Action MyEvent; 

But when I try it in my own code, I get this error

Using the generic type ‘System.Action’ requires ‘1’ type arguments

The documentation certainly describes a form of Action without any type parameter. What am I missing?

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  1. 2026-05-11T09:42:28+00:00Added an answer on May 11, 2026 at 9:42 am

    Make sure your application is referencing System.Core.

    Edit – also make sure you are targeting .NET 3.5 as the System.Core.dll is part of that version.

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