#1,152 – The Action Delegate Type

The .NET Framework includes the Action predefined delegate type that represents the signature of a method that accepts zero or more parameters and does not have a return value (i.e. returns void).

Overloads of Action are :

  • delegate void Action()
  • delegate void Action(T p1)
  • delegate void Action(T1 p1, T2 p2)
  • etc…

You might define your own delegate type:

        public delegate void Merger<T1,T2>(T1 thing1, T2 thing2);

        static void MergeIntAndString<T1,T2>(Merger<T1,T2> myMerger, T1 n, T2 s)
        {
            myMerger(n, s);
        }

        public static void ConcatIntString(int n, string s)
        {
            Console.WriteLine("{0}{1}", n, s);
        }

        static void Main(string[] args)
        {
            MergeIntAndString(ConcatIntString, 42, "Adams");
        }

However, you could instead use the Action delegate type, avoiding the definition of your own custom delegate type.

        static void MergeIntAndString<T1,T2>(Action<T1,T2> myMerger, T1 n, T2 s)
        {
            myMerger(n, s);
        }

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,152 – The Action Delegate Type

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