What is LINQ?

This article introduces the knowledge of "what is LINQ". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

What is LINQ?

LINQ is Language Integrated Query (language integrated query). When we want to query the database table, we must write the statement "select * from sometable where". Well, according to the syntax of LINQ, we can use the familiar SQL statements like "select", "from", "where" and so on smoothly in the .NET Framework environment and greatly improve the efficiency of development.

1. Download the LinQ framework first

Now * version is released in May 2006, "Orcas CTP", download address (http://www.microsoft.com/downloads/details.aspx?familyid=1e902c21-340c-4d13-9f04-70eb5e3dceea&displaylang=en))

two。 Download and installation is complete.

3. Create a new LINQ Console Application project.

4. The input code is as follows:

Using System; using System.Collections.Generic; using System.Text; using System.Query; using System.Xml.XLinq; using System.Data.DLinq; namespace LINQConsoleApplication1 {class Program {static void Main (string [] args) {string [] aBunchOfWords = {"One", "Two", "Hello", "World", "Four", "Five"}; var result = from sin aBunchOfWords where s.Length = = 5 select s Foreach (var s in result) {Console.WriteLine (s);}

The running results are as follows:

Hello

World

Print any key to continue...

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