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c#.nettypesparametersdelegates

Func delegate with no return type

All of the Func<T> delegates return a value. What are the .NET delegates that can be used with methods that return void?

Solution

  • All Func delegates return something; all the Action delegates return void.

    Func<TResult> takes no arguments and returns TResult:

    public delegate TResult Func<TResult>()

    Action<T> takes one argument and does not return a value:

    public delegate void Action<T>(T obj)

    Action is the simplest, 'bare' delegate:

    public delegate void Action()

    There's also Func<TArg1, TResult> and Action<TArg1, TArg2> (and others up to 16 arguments). All of these (except for Action<T>) are new to .NET 3.5 (defined in System.Core).