个人理解的单例模式

下面是个人理解的单例模式：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication6

{

  public  sealed class Singleton

    {

      static Singleton instance;

      /// <summary>

      /// 为了避免实例不唯一，构造方法私有化

      /// </summary>

      private Singleton() { }

      public static Singleton Instance

      {

          get

          {

              return instance == null ? new Singleton() : instance;

          }

      }

      public void dd(){

          Console.WriteLine("fdd");

          Console.ReadLine();

      }
}

}

主方法调用如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication6

{

    class Program

    {

        static void Main(string[] args)

        {

            Singleton.Instance.dd();
}

    }

}

当然这有时候不能保证单例唯一，可以用lock方法来实现如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication6

{

    public sealed class Singleton

    {

        static Singleton instance;

        static readonly object padlock = new object();
public Singleton() { }

        public static Singleton Instance

        {
get

            {

                if (instance == null)

                {

                    lock (padlock)

                    {

                        if (instance == null)

                        {

                            instance=new Singleton() ;

                        }
}
}

                return instance;

            }

        }

        public void dd()

        {

            Console.WriteLine("fdd");

            Console.ReadLine();

        }
}

}

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