//public static Singleton singletonCommon = new Singleton();//只构造一个对象
static void Main(string[] args)
{
try
{
Console.WriteLine("欢迎来到.net高级班公开课之设计模式特训，今天是Eleven老师为大家带来的单例模式Singleton");
////Singleton singleton = Singleton.CreateInstance(); //new Singleton();//只构造一个对象
////for (int i = 0; i < 10; i++)
////{
//// Singleton singleton = Singleton.CreateInstance();
//// Singleton singleton = new Singleton();//每次都构造一个对象
//// singletonCommon.Show();
//// singleton.Show();
////}
////StudentA.UseSingleton();
////StudentB.UseSingleton();
////StudentC.UseSingleton();
List <IAsyncResult> resultList = new List <IAsyncResult>();
for (int i = 0; i < 10; i++)
{
resultList.Add(new Action(() =>
{
Singleton singleton = Singleton.CreateInstance();
singleton.Show();
}).BeginInvoke(null, null));//会启动一个异步多线程调用
}
while (resultList.Count(r => !r.IsCompleted) > 0)
{
Thread.Sleep(10);
}
for (int i = 0; i < 10; i++)
{
resultList.Add(new Action(() =>
{
SingletonSecond singleton = SingletonSecond.CreateInstance();
singleton.Show();
}).BeginInvoke(null, null));//会启动一个异步多线程调用
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}
/// <summary>
/// 静态字段在程序进程只有一个
/// </summary>
//public static Singleton singleton = new Singleton();
static void Main(string[] args)
{
try
{
SingletonSecond second = SingletonSecond.CreateInstance();
SingletonThird third = SingletonThird.CreateInstance();
//Singleton singleton = new Singleton();
//对象的重用
TaskFactory taskFactory = new TaskFactory();
List <Task> taskList = new List <Task>();
//for (int i = 0; i < 50000; i++)
//{
// taskList.Add(taskFactory.StartNew(() =>
// {
// Singleton singleton = Singleton.CreateInstance();// new Singleton();
// singleton.Show();//多线程去运行同一个实例的同一个方法
// }));
//}
for (int i = 0; i < 50000; i++)
{
taskList.Add(taskFactory.StartNew(() =>
{
SingletonSecond singleton = SingletonSecond.CreateInstancePrototype();// new Singleton();
singleton.Show();
}));
}
Task.WaitAll(taskList.ToArray());
Console.WriteLine("第一轮全部完成");
//for (int i = 0; i < 5; i++)
//{
// taskList.Add(taskFactory.StartNew(() =>
// {
// Singleton singleton = Singleton.CreateInstance();// new Singleton();
// //singleton.Show();
// }));
//}
//0 1 50000 还是接近50000
Console.WriteLine(SingletonSecond.CreateInstancePrototype().iTotal);
//for (int i = 0; i < 5; i++)
//{
// taskFactory.StartNew(() =>
// {
// Singleton singleton = Singleton.CreateInstance();// new Singleton();
// singleton.Show();
// });
//}
//OtherClass.Show();
//OtherClass.Show();
//OtherClass.Show();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}
static SingletonSecond()
{
_singletonSecond = new SingletonSecond();
}
/// <summary>
/// 静态构造函数：由CLR自行调用，在第一次使用这个类之前，调用而且只调用一次
/// </summary>
static SingletonSecond()
{
_Singleton = new SingletonSecond();
}
}//饿汉式 只要使用类就会被构造
/// <summary>
/// 原型模式:解决对象重复创建的问题
/// 通过MemberwiseClone来clone新对象，避免重复创建
/// </summary>
/// <returns></returns>
public static SingletonSecond CreateInstancePrototype()
{
SingletonSecond second = (SingletonSecond)_SingletonSecond.MemberwiseClone();
return(second);
}
/// <summary>
/// 静态构造函数:由CLR保证，程序第一次使用这个类型前被调用，且只调用一次
///
/// 写日志功能的文件夹检测
/// XML配置文件
/// </summary>
static SingletonSecond()
{
_SingletonSecond = new SingletonSecond();
Console.WriteLine("SingletonSecond 被启动");
}
