Example Analysis of LINQ expression Tree

Editor to share with you the example analysis of the LINQ expression tree, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Linq.Expressions Namespace ConsoleApplication3 {class Program {static void Main (string [] args) {/ / important class * / / BinaryExpression: dual, binary The expression / / ParameterExpression consists of two things: get the parameter IQueryable a = Enumerable.Range (0, 1000). AsQueryable () Expression expression = r = > r < 20 & & r = = 2; / / = query expression tree (expression) parameter (only one parameter) foreach (var item in expression.Parameters) {Console.WriteLine ("parameter: {0}, node type: {1}", item, item.NodeType) / / output: parameters: r, node type: Lambda} / / = query expression tree (expression) body part / / output: body part: (r < 20 AndAlso r = = 2), node type: Lambda Console.WriteLine ("body part: {0}, node type: {1}", expression.Body, expression.NodeType) / / the left body of the query expression tree (expression) / / output: (r < 20) to cast the type to the BinaryExpression type Console.WriteLine (BinaryExpression) expression.Body) .left) / / = query the variable type on the left side of the main part of the expression tree (expression) / / Int32 Console.WriteLine (BinaryExpression) ((BinaryExpression) expression.Body) .left) .Left.Type.Name); Console.ReadKey ();} above is all the content of the article "sample Analysis of LINQ expression Tree". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!