A singleton model from C # angle lazy and a hungry man

Single-Case mode:

Key points: 1, a class has only one instance, 2, the class to create the instance itself, 3, the class itself to the entire system to provide this instance.

Code Show:

namespacesingleton{/// <summary>    ///Lazy single case, multithreading security///lazy, do not create an instance when the class loads, so the class loads faster, but the runtime gets the object at a slower speed/// </summary>     Public classLazysingleton {Private StaticLazysingleton instance =NULL; //Multithreading Security        Private Static ObjectLockObject =New Object(); PrivateLazysingleton () {Console.WriteLine ("private Lazysingleton ()"); }         Public StaticLazysingleton Instance {Get            {                //no need to lock each time to improve efficiency                if(Instance = =NULL)                {                    //Multithreading Security                    Lock(lockobject) {if(Instance = =NULL)                        {                            return NewLazysingleton (); }                    }                }                returninstance; }        }    }    /// <summary>    ///a hungry man single case///initialization is done at class load, so class loading is slow, but getting objects is faster/// </summary>     Public classEagersingleton {//readonly allocation of dynamic memory        Private Static ReadOnlyEagersingleton instance =NewEagersingleton (); PrivateEagersingleton () {Console.WriteLine ("private Eagersingleton ()"); }         Public StaticEagersingleton Instance {Get            {                returninstance; }        }    }    classProgram {Static voidMain (string[] args) {            varLazy =lazysingleton.instance; varEager =eagersingleton.instance; }    }}

A singleton model from C # angle lazy and a hungry man