Explain FUNC,ACTION and PREDICATE with real-time examples

Question

I want to know about FUNC,ACTION and PREDICATE with real-time examples. The example must be understand-able.

Catcher Wong · Answer

PREDICATE Valid a number is an odd. class Program { static void Main( string [] args) { Predicate int > predicate1 = IsOdd; Predicate int > predicate2 = x => { return x % 2 == 0; }; Console.WriteLine(predicate1.Invoke(20)); Console.WriteLine(predicate2(20)); Console.WriteLine(predicate1.Method.ToString()); Console.WriteLine(predicate2.Method.ToString()); Console.Read(); } static bool IsOdd( int num) { return num % 2 == 0; } } ACTION print elements of the list class Program { static void Main( string [] args) { Action int > action1 = new Action int >(Print); Action int > action2 = new Action int >(x => { Console.WriteLine(x); }); var list = new List int >() { 1,2,3}; list.ForEach(action1); Console.WriteLine( "==" ); list.ForEach(action1); Console.WriteLine( string .Format( "the method to invoke of action1 is [{0}]" , action1.Method.ToString())); Console.WriteLine( string .Format( "the method to invoke of action2 is [{0}]" , action2.Method.ToString())); Console.Read(); } static void Print( int x) { Console.WriteLine(x); } } FUNC Calculate the sum of two number class Program { static void Main( string [] args) { Func int , int , int > func1 = Add; Func int , int , int > func2 = (x, y) => { return x + y; }; Console.WriteLine(func1(1,2)); Console.WriteLine(func2.Invoke(1,2)); Console.WriteLine(func1.Method.ToString()); Console.WriteLine(func2.Method.ToString()); Console.Read(); } static int Add( int num1, int num2) { return num1 + num2; } } Hope the examples can help you!

Explain FUNC,ACTION and PREDICATE with real-time examples

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