C# ThreadPool之QueueUserWorkItem使用案例详解

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我是靠谱客的博主曾经龙猫，最近开发中收集的这篇文章主要介绍C# ThreadPool之QueueUserWorkItem使用案例详解，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

先看代码：

//设置可以同时处于活动状态的线程池的请求数目。 
bool pool = ThreadPool.SetMaxThreads(8, 8);
if (pool) {
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数1"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数2"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数3"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数4"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数5"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数6"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数7"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数8"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数9"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数10"));
    ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数11"));
};

上面代码先设置线程池中最大并发量为8个，然后通过QueueUserWorkItem向线程池中添加11个方法，运行，输出结果：

可以看出，先运行了8个，当有一个任务结束后线程池中有空闲线程时，排队的下一个任务才会执行，

把最大并发量改成9试试：

{
    //设置可以同时处于活动状态的线程池的请求数目。 
    bool pool = ThreadPool.SetMaxThreads(9, 9);
    if (pool) {
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数1"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数2"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数3"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数4"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数5"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数6"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数7"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数8"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数9"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数10"));
        ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数11"));
    };
}

运行结果：