design mode (C #)

Returns the design mode (C #) series Article index

Introduced

Guarantees that a class has only one instance and provides a global access point to access it.

Example

Ensure that a class has only one instance.

Singleton

using System;
using System.Collections.Generic;
using System.Text;

namespace Pattern.Singleton
{
　　/**//// <summary>
　　/// 泛型实现单例模式
　　/// </summary>
　　/// <typeparam name="T">需要实现单例的类</typeparam>
　　public class Singleton<T> where T : new()
　　{
　　　　/**//// <summary>
　　　　/// 返回类的实例
　　　　/// </summary>
　　　　public static T Instance
　　　　{
　　　　　　get { return SingletonCreator.instance; }
　　　　}

　　　　class SingletonCreator
　　　　{
　　　　　　internal static readonly T instance = new T();
　　　　}
　　}
}

Test

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using system.web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using Pattern.singleton;

public partial class Singleton:System.Web.UI.Page
{
protected void Page_Load (object sender, EventArgs e) br> {
//Use singleton mode to ensure that a class has only one instance
Response.Write (Singleton<test>. Instance.time);
Response.Write ("<br/>");
Response.Write (Singleton<test>. Instance.time);
Response.Write ("<br/>"); 　　　　

//No single case mode
Test t = new test ();
Response.Write (T.time);
Response.Write ("<br/>");
Test t2 = new Test ();
Response.Write (T2. Time);
Response.Write ("<br/>");
}
}

public class Test
{
Private datetIME _time; 　　　　

Public Test ()
{
System.Threading.Thread.Sleep (3000);
　　_time = DateTime.Now;
}

public string time
{
get {_time. ToString (); }
}


Run results

2007-2-10 22:35:11
2007-2-10 22:35:11
2007-2-10 22:35:14
2007-2-10 22:35:17

Reference

Http://www.dofactory.com/Patterns/PatternSingleton.aspx

Ok