C # Introduction to generic interfaces of generic methods,

C # Introduction to generic interfaces of generic methods,

Here, I want to add the necessary knowledge to those who want to have a deeper understanding in. Net!

The following describes generic methods, generic interfaces, and generic classes:

1. generic classes

Declare a class

Using System; using System. collections. generic; using System. linq; using System. text; namespace AutofacDemo {// interface IFanXingable <T> {T SayNumber (T t);} // generic class public class FanXing <T> // where T: class, new () {T [] arryStrings = new T [] {}; // The indexer public T this [int index] {get {return arryStrings [index];} set {arryStrings [index] = value ;}// generic method public T Add <T> (T str) {return str ;}}}

Call where it is needed

Using System; using System. codeDom; using System. collections. generic; using System. data. common; using System. linq; using System. reflection; using System. security. authentication. extendedProtection; using System. text; using Autofac. configuration; namespace AutofacDemo {
// Test the generic type
Public class Person
{
Public string Name {get; set ;}
Public int Age {get; set ;}


Public void Add <T> (T t)
{
Console. WriteLine (t );
}
}

Static void Main (string [] args) {// instantiate FanXing <string> fanXing = new FanXing <string> (); fanXing [0] = "aaa1 "; fanXing [1] = "aaa2"; fanXing [2] = "aaa3"; fanXing [3] = "aaa4 "; fanXing <int> fanXingInt = new FanXing <int> (); fanXingInt [0] = 1; fanXingInt [2] = 2; fanXingInt [3] = 4; fanXingInt [4] = 3; FanXing <Person> fanXingClass = new FanXing <Person> (); fanXingClass [0] = new Person () {Name = "guo ", age = 21}; fanXingClass [0] = new Person () {Name = "yang", Age = 20 }; // method generic is the abstract data type of the data type. It is the abstract Console of the object. readKey ();}}}

How to Implement generic interfaces? This is also simple. Declare a class and directly inherit the interface you have defined.

// Implement the public class MyClass: IFanXingable <Int32> {public int SayNumber (int t) {return t ;}}

What about method generics? It is simpler to get a generic method in the base class and implement it when the subclass is inherited. However, I would like to think about the situations where I used them, for example, when querying by PAGE, There Is A sort by age? Or sort by ID or by date? This is an uncertain factor, so here is the most appropriate place to use generic methods!

 

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