public string AddNumString()
{
Class_single cs = Class_single.GetInstance();//单例
//Class_single cs = new Class_single();//未单例
return(cs.AddNum().ToString());
}
public static Class_single GetInstance()
{
if (g_cs == null)
{
lock (g_locker)//锁，为了避免多个线程同时实例化
{
g_cs = new Class_single();
}
}
return(g_cs);
}