单例类

   1:   

   2:  using System;

   3:  using System.Collections.Generic;

   4:  using System.Text;

   5:  using System.IO;

   6:  using System.Runtime.Serialization.Formatters.Binary;

   7:  using System.Runtime.Serialization;

   8:   

   9:  namespace AkDTH.Common

  10:  {

  11:      /// <summary>

  12:      /// 单例模式泛型类

  13:      /// </summary>

  14:      public sealed class SingleObject<T> where T : new()

  15:      {

  16:          #region GetInstance  采用lock锁定线程判断方式

  17:          static readonly object padlock = new object();

  18:          private static T singleObject = default(T);

  19:          /// <summary>

  20:          /// 单例模式，返回SingleObject实例

  21:          /// </summary>

  22:          /// <returns>返回具体的泛型类</returns>

  23:          public static T GetInstance()

  24:          {

  25:              if (singleObject == null)

  26:              {

  27:                  //利用辅助对象锁定当前线程

  28:                  lock (padlock)

  29:                  {

  30:                      //双重判断服务对象是否为空

  31:                      if (singleObject == null)

  32:                      {

  33:                          singleObject = new T();

  34:                      }

  35:                  }

  36:              }

  37:              return singleObject;

  38:          }

  39:          #endregion

  40:          #region 属性:Instance  第二种单例方法：采用内部嵌套类来延迟产生单例对象

  41:          /// <summary>

  42:          /// 返回单例对象的属性

  43:          /// 只要不访问Instance属性，访问该类中其他方法都不会初始化对象，

  44:          /// 实现了延迟加载

  45:          /// </summary>

  46:          public static T Instance

  47:          {

  48:              get

  49:              {

  50:                  //调用内部嵌套类，利用嵌套类来延迟产生对象实例

  51:                  return Nested.instance;

  52:              }

  53:          }

  54:          /// <summary>

  55:          /// 密封的内部嵌套辅助类，辅助创建单例对象

  56:          /// </summary>

  57:          sealed class Nested

  58:          {

  59:              /// <summary>

  60:              /// 静态化构造方法，避免被new

  61:              /// </summary>

  62:              static Nested()

  63:              {

  64:              }

  65:              /// <summary>

  66:              /// 只读的父类型属性

  67:              /// </summary>

  68:              internal static readonly T instance = new T();

  69:          }

  70:          #endregion

  71:   

  72:   

  73:          

  74:      }

  75:  }