Single-Instance mode net

The recent use of a singleton mode, the following is a personal understanding, if there is no wrong, please all the way the big God pointing

1. Introduction: The singleton pattern strictly defines a class with only one instance and provides one of his global access points.

2. Problem solving: Singleton mode is required when a class simply requires that an instance can be created.

3. Composition: consists of a private variable, a private constructor, and a public method.

4. Example:

public class Singleton {//<summary>////programs to create a static read-only process helper object///</summary> Private stat    IC ReadOnly Object _object=new object ();            <summary>///construction method Private, foreign keys cannot instantiate this class through the new class//</summary> private static Singleton instance;        Private constructor Method Singleton (), you cannot use the New keyword to create an instance of this class. Private Singleton () {}//<summary>////This method is the only global access point for this class of instances//(double lock double-check Locking)///&L t;/summary>//<returns></returns> public static Singleton getinstance () {//First sentence If a broken instance is present, there is no more lock processing if (instance==null) {////The part of the program with the lock at the same time only one thread can enter, loc                    K (_object) {//If the instance does not exist, then new instance is returned, otherwise an existing instance if (Instance==null)                    {instance = new Singleton (); }}} return INstance; }} Client call: Class Program {static void Main (string[] args) {var singleton1 = Singleton.get            Instance ();            var singleton2 = singleton.getinstance ();            if (Singleton1==singleton2) {Console.WriteLine ("2 instances of the same");        } console.readkey (); }    }

　　

Single-Instance mode net