C#AutoResetEvent和ManualResetEvent介绍 AutoResetEvent和ManualResetEvent是c#用来线程同步的。AutoResetEvent参考：https://learn.microsoft.com/zh-cn/dotnet/api/system.threading.autoresetevent?view=net-7.0Set():将事件设置为已发送信号状态，对于AutoResetEvent来说允许一个正在等待的线程继续执行。如果没有线程在等待，将保持无限期有信号状态。WaitOne():处于无信号状态时，阻塞当前线程直到接收到了信号量如果线程在处于信号状态时AutoResetEvent调用WaitOne，则线程不会阻塞。AutoResetEvent立即释放线程并返回到无信号状态。也就是说如果没有线程在WaitOne，先执行了Set，会导致后调用的第一次WaitOne失效不阻塞，第二次调用WaitOne阻塞会生效using System; using System.Threading; namespace AutoResetEvent_Examples { class MyMainClass { const int numIterations = 100; static AutoResetEvent myResetEvent = new AutoResetEvent(false); static int number; static void Main() { //定义线程并启动，MyReadThreadProc方法接收到信号量后读取当前线程的名字和number并打印 Thread myReaderThread = new Thread(new ThreadStart(MyReadThreadProc)); myReaderThread.Name = "ReaderThread"; myReaderThread.Start(); for(int i = 1; i <= numIterations; i++) { Console.WriteLine("Writer thread writing value: {0}", i); number = i; //Signal that a value has been written. //调用Set()后MyReadThreadProc()从WaitOne()继续执行 myResetEvent.Set(); //Give the Reader thread an opportunity to act. Thread.Sleep(1); } //Terminate the reader thread. myReaderThread.Abort(); } static void MyReadThreadProc() { while(true) { //The value will not be read until the writer has written // at least once since the last read. myResetEvent.WaitOne(); Console.WriteLine("{0} reading value: {1}", Thread.CurrentThread.Name, number); } } } }官网拷贝的代码，只有当Main()中的for循环调用myResetEvent.Set()，MyReadThreadProc()才会收到信号来读取当前线程的名字，否则就会一直停在myResetEvent.WaitOne()而不会继续向后执行。ManualResetEvent参考：https://learn.microsoft.com/zh-cn/dotnet/api/system.threading.manualresetevent?view=net-7.0Set():将事件设置为已发送信号状态，对于ManualResetEvent来说允许所有正在等待的线程继续执行Reset():设置事件无信号，使能够继续阻塞线程using System; using System.Threading; public class Example { // mre is used to block and release threads manually. It is // created in the unsignaled state. private static ManualResetEvent mre = new ManualResetEvent(false); static void Main() { Console.WriteLine("\nStart 3 named threads that block on a ManualResetEvent:\n"); //定义三个线程 for(int i = 0; i <= 2; i++) { Thread t = new Thread(ThreadProc); t.Name = "Thread_" + i; t.Start(); } Thread.Sleep(500); Console.WriteLine("\nWhen all three threads have started, press Enter to call Set()" + "\nto release all the threads.\n"); Console.ReadLine(); //给信号使ThreadProc()中的WaitOne()之后的代码执行 mre.Set(); Thread.Sleep(500); Console.WriteLine("\nWhen a ManualResetEvent is signaled, threads that call WaitOne()" + "\ndo not block. Press Enter to show this.\n"); Console.ReadLine(); for(int i = 3; i <= 4; i++) { Thread t = new Thread(ThreadProc); t.Name = "Thread_" + i; t.Start(); } //ManualResetEvent在调用Set()之后，WaitOne()并不会阻塞线程，要想阻塞线程，需要调用Reset()使没有信号，才能够继续阻塞线程 Thread.Sleep(500); Console.WriteLine("\nPress Enter to call Reset(), so that threads once again block" + "\nwhen they call WaitOne().\n"); Console.ReadLine(); //调用Reset()后继续阻塞线程 mre.Reset(); // Start a thread that waits on the ManualResetEvent. Thread t5 = new Thread(ThreadProc); t5.Name = "Thread_5"; t5.Start(); Thread.Sleep(500); Console.WriteLine("\nPress Enter to call Set() and conclude the demo."); Console.ReadLine(); mre.Set(); // If you run this example in Visual Studio, uncomment the following line: Console.ReadLine(); } private static void ThreadProc() { string name = Thread.CurrentThread.Name; Console.WriteLine(name + " starts and calls mre.WaitOne()"); mre.WaitOne(); Console.WriteLine(name + " ends."); } } /* Start 3 named threads that block on a ManualResetEvent: Thread_0 starts and calls mre.WaitOne() Thread_1 starts and calls mre.WaitOne() Thread_2 starts and calls mre.WaitOne() When all three threads have started, press Enter to call Set() to release all the threads. Thread_1 ends. Thread_0 ends. Thread_2 ends. When a ManualResetEvent is signaled, threads that call WaitOne() do not block. Press Enter to show this. Thread_3 starts and calls mre.WaitOne() Thread_3 ends. Thread_4 starts and calls mre.WaitOne() Thread_4 ends. Press Enter to call Reset(), so that threads once again block when they call WaitOne(). Thread_5 starts and calls mre.WaitOne() Press Enter to call Set() and conclude the demo. Thread_5 ends. */ 简单总结一下二者区别：1.AutoResetEvent调用Set只给一个正在WaitOne的线程信号使之继续执行，ManualResetEvent调用Set会给所有正在WaitOne的线程信号使之继续执行2.在调用Set后ManualResetEvent将保持有信号状态，WaitOne将失效，不再进行线程阻塞，需要重新阻塞的话要调用Reset，但AutoResetEvent（在已经有线程WaitOne的情况下）会自动返回到无信号状态。