CSHARP -- Lambda expression

1. Definition:

A. Lambda expressions are anonymous expressions.

B. It can contain expressions and statements.

C. can be used to create a delegate or expression directory tree type

D. Syntax: Input Params => expression or code block. (Data parameter on the left and expression or statement block on the right .)

Eg:

// Multiple parameters (x, y) => X = y // No Params (int x, string S) => S. length> X // No parameter. Note: only one parameter can omit brackets: x => X * X () => somemethod () // statement block. Note: braces are used in the statement block. (Input parameters) =>{ statement ;}

Note: Lambda statements, like anonymous methods, cannot be used to create expression directory trees.

2. Simple use

A. Use in delegation (lambda expression)

       delegate int del(int i);       del myDelegate = x => x * x;       int j = myDelegate(5); //j = 25

B. delegation not used (lambda expression)

Delegate int del (int I); del mydelegate = delegate (int I) {I * I}; // anonymous method Int J = mydelegate (5); // J = 25

C. Create expression directory tree type:

         using System.Linq.Expressions;         // ...         Expression<del> = x => x * x;