Use Funcs only if you want results back

Anuj Varma — Wed, 12 Oct 2011 22:12:46 +0000

If you are trying to encapsulate a method that returns a value, Funcs are ideal. However, what if your method returns void? Func will not work (Funcs were designed to wrap methods with return values only). However, a similar construct, called Action does just this – encapsulate a method without a return value. See usage of these two delegates below:

// Use Func only if the method that you are encapsulating returns a value
Func<int, string> myFunc = (x) => String.Format("The int is {0}", x);
myFunc.Invoke(4);

// No returned value? Use Action instead
Action<string> voidReturnType = (x) => Console.WriteLine(x);

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Use Funcs only if you want results back