. Net uses the record about Linq today, And. net uses linq today.

. Net uses the record about Linq today, And. net uses linq today.

 

I have been in touch with. net since my internship for more than half a year. Today, I have encountered a problem with LINQ in my project.

So I searched the internet and found out here to make it easier for me to view 0_0.

Language Integrated Query is a set of extensions for c # and Visual Basic languages.

It allows you to write C # Or Visual Basic code to query memory data in the same way as a database.

　　　　　　

Some extensions that can be implemented by LINQ

Where, Max, Select, Sum, Any, Average, All, Concat, etc.

　　　　　　

Small example on the Internet

List <int> arr = new List <int () {1, 2, 3, 4, 5, 6, 7 };

Var result = arr. Where (a =>{ return a> 3 ;}). Sum ();

Console. WriteLine (result );

Console. ReadKey ();

 

LINQ traversal DataTable filtering data

// All Student Information
DataTable stu_dt = new ClassDap (). GetAllXJ ();

　　　　

// Query using the Select Method

String stuName = stu_dt.Select ("f_x133 = '" + "condition" + "'") [0] ["f_xm"]. ToString ();
String classId = stu_dt.Select ("f_xsid = '" + "condition" + "'") [0] ["f_bj"]. ToString ();