cannot create event of type Action<String>

Following discuss Problem to pass the result to the caller for asynchronous httpWebRequest I tried to created an event of type 开发者_JAVA技巧Action

public event Action<string> ResponseResult;

but Silverlight refuses event keyword: it says expect class, delegate, ...

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You are defining the event in the wrong place. If you have your Helper class (reference the original post) then you need to declare the event inside this class:

public class Helper
{
     public event Action<string> ResponseResult;

     // rest of code...
}

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C# is C#, whether it's against Silverlight or the .NET Framework that you're building.

My guess is that you're trying to define an event outside of the scope of a class.