设计模式-单例模式

最新推荐文章于 2025-05-07 13:56:22 发布

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最新推荐文章于 2025-05-07 13:56:22 发布

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分类专栏：设计模式文章标签： c# 设计模式

本文链接：https://blog.youkuaiyun.com/gy0124/article/details/106769255

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常规单例模式-简单的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Clone
{
    class Program
    {
        abstract class property
        {
            public abstract property Clone();
        }
        class ConcreatProperty
        {
            public static ConcreatProperty OnlyObj = null;

            private string str;
            public string Str
            {
                get
                {
                    return str;
                }
                set
                {
                    str = value;
                }

            }
            public static ConcreatProperty Clone()
            {

                if(OnlyObj == null)
                {
                    OnlyObj = new ConcreatProperty();
                    OnlyObj.Str = "我是克隆";

                }
                return OnlyObj;
              

            }
        }
        static void Main(string[] args)
        {
            ConcreatProperty t1,t2,t3;
            t1 = ConcreatProperty.Clone();
            t2 = ConcreatProperty.Clone();
            t3 = ConcreatProperty.Clone();
      
  
            Console.WriteLine(t2 == t1&&t1==t3);
      
            Console.ReadKey();

        }
    }
}

安全单例模式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Clone
{
    class Program
    {
        abstract class property
        {
            public abstract property Clone();
        }
        class ConcreatProperty
        {
            public static ConcreatProperty OnlyObj = null;
            private static readonly object lockObj = new object();
            private string str;
            public string Str
            {
                get
                {
                    return str;
                }
                set
                {
                    str = value;
                }

            }
            public static ConcreatProperty Clone()
            {

                if (OnlyObj == null)
                {
                    lock (lockObj)
                    {
                        if (OnlyObj == null)
                        {
                            OnlyObj = new ConcreatProperty();
                            OnlyObj.Str = "我是克隆";
                        }
                    }


                }
                return OnlyObj;


            }
        }
        static void Main(string[] args)
        {
            ConcreatProperty t1,t2,t3;
            t1 = ConcreatProperty.Clone();
            t2 = ConcreatProperty.Clone();
            t3 = ConcreatProperty.Clone();
      
  
            Console.WriteLine(t2 == t1&&t1==t3);
            Console.WriteLine(t1.Str);
            Console.ReadKey();

        }
    }
}