static void Main(string[] args)
{
{
//单线程-非单例
for (int i = 0; i < 10; i++)
{
Func func = new Func();
func.Show();
}
//单线程-单例
for (int i = 0; i < 10; i++)
{
SingleFunc single = SingleFunc.CreateObject();
single.Show();
}
}
{
//多线程-单例
for (int i = 0; i < 10; i++)
{
new Action(() =>
{
SingleFunc single = SingleFunc.CreateObject();
single.Show();
}).BeginInvoke(null, null);
}
}
Console.ReadKey();
}
public static SingleFunc CreateObject()
{
if (single == null)//防止多线程等待锁
{
lock (lockObj)
{
//假如此时有耗时功能,最外层判断可以防止多线程等锁
//Thread.Sleep(1000);
if (single == null)
{
single = new SingleFunc();
}
}
}
return(single);
}