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The Action<T> delegate return void. Is there any other built-in delegate which returns non void value?
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If you have a method that accepts two numbers and you want to add them and return the sum of the two numbers, you can use a delegate to store the return value of the method as shown in the code snippet given below. int result = d(12, 15);
Action delegate is an in-built generic type delegate. This delegate saves you from defining a custom delegate as shown in the below examples and make your program more readable and optimized. It is defined under System namespace.
public delegate void Del(string message); A delegate object is normally constructed by providing the name of the method the delegate will wrap, or with a lambda expression. Once a delegate is instantiated, a method call made to the delegate will be passed by the delegate to that method.
The myDelegate is a user-defined name of the delegate that takes a single integer parameter and its return type is void that does not return any value.
Yes. Func<> returns the type specified as the final generic type parameter, such that Func<int> returns an int and Func<int, string> accepts an integer and returns a string. Examples:
Func<int> getOne = () => 1; Func<int, string> convertIntToString = i => i.ToString(); Action<string> printToScreen = s => Console.WriteLine(s); // use them printToScreen(convertIntToString(getOne())); Sure, the Func Delegates return T.
Func<TResult> is "TResult method()" Func<TInput, TResult> is "TResult method(TInput param)" All the way down to
Func<T1, T2, T3, T4, TResult> http://msdn.microsoft.com/en-us/library/bb534960.aspx
http://msdn.microsoft.com/en-us/library/bb534303.aspx
Also, for the sake of completeness, there is Predicate which returns bool.
Predicate<T> is "bool method(T param)" http://msdn.microsoft.com/en-us/library/bfcke1bz.aspx
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