.net 4.0新特性-延迟初始化:Lazy(转),ThreadLocal<T>

感谢作者
/article/6958033.html

http://www.cnblogs.com/me-sa/archive/2010/05/25/lazy-initialization-fx4.html

.net也有ThreadLocal了

/article/5633907.html

.net 4.0之前用ThreadStatic标签代替

http://msdn.microsoft.com/en-us/library/dd997286(v=VS.100).aspx

补充

1. ThreadStatic的使用情况

代码 public class Demo7
{
static int count=100000;
public Demo7()
{
ThreadPool.QueueUserWorkItem(new WaitCallback(Task1));
ThreadPool.QueueUserWorkItem(new WaitCallback(Task2));
}

public void Task1(object obj)
{
for (int i = 0; i < 100000; i++)
{
count++;
}

Console.WriteLine(DateTime.Now);
Console.WriteLine("Task1 count {0}", count);
}

public void Task2(object obj)
{
for (int i = 0; i < 100000; i++)
{
count++;
}
Console.WriteLine("Task2 count {0}", count);
}
}

显示效果



显示为乱数,其实不准的

2.使用了 ThreadStatic以后的结果



即该变量已经成为线程的局部变量,初始化的值也重置了