C#线程优先级的必要性：如果在应用程序中有多个线程在运行，但一些线程比另一些线程重要，该怎么办在这种情况下，可以在一个进程中为不同的线程指定不同的优先级。一般情况下，如果有优先级较高的线程在工作，就不会给优先级较低的线程分配任何时间片，其优点是可以保证给接收用户输入的线程指定较高的优先级。在大多数的时间内，这个线程什么也不做，而其他线程则执行它们的任务。但是，如果用户输入了信息，这个线程就立即获得比应用程序中其他线程更高的优先级，在短时间内处理用户输入事件。
C#线程优先级的规律：高优先级的线程可以完全阻止低优先级的线程执行，因此在改变线程的优先级时要特别小心。线程的优先级可以定义为ThreadPriority枚举的值，即Highest、AboveNormal、Normal、BelowNormal和 Lowest。
注意，每个进程都有一个基本优先级，这些值与进程的优先级是有关系的。给线程指定较高的优先级，可以确保它在该进程中比其他线程优先执行，但系统上可能还运行着其他进程，它们的线程有更高的优先级。因此Windows给自己的操作系统线程指定高优先级。
在ThreadPlayaround示例中，对Main()方法做如下修改，就可以看出修改线程的优先级的效果：
- ThreadStart workerStart = new ThreadStart(StartMethod);
- Thread workerThread = new Thread(workerStart);
- workerThread.Name = "Worker";
- workerThread.Priority = ThreadPriority.AboveNormal;
- workerThread.Start();
其中，工作线程的优先级比主线程高，运行结果如下所示：
- ThreadPlayaroundWithPriorities
- Interval to display results at> 1000000
- Starting thread: Main Thread
- Main Thread: Current Culture = en-US
- Starting thread: Worker
- Worker: Current Culture = en-US
- Main Thread: count has reached 1000000
- Worker: count has reached 1000000
- Worker: count has reached 2000000
- Worker: count has reached 3000000
- Worker: count has reached 4000000
- Worker: count has reached 5000000
- Worker: count has reached 6000000
- Worker: count has reached 7000000
- Worker: count has reached 8000000
- Worker Thread Finished
- Main Thread: count has reached 2000000
- Main Thread: count has reached 3000000
- Main Thread: count has reached 4000000
- Main Thread: count has reached 5000000
- Main Thread: count has reached 6000000
- Main Thread: count has reached 7000000
- Main Thread: count has reached 8000000
- Main Thread Finished
这说明，当工作线程的优先级为AboveNormal时，一旦工作线程被启动，主线程就不再运行。
C#线程优先级的相关内容就向你介绍到这里，希望对你了解和学习C#线程优先级有所帮助。
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