如何在c＃中的函数中等待 [英] How to wait in a function in c#

问题描述

如何在函数中等待，直到布尔变量设置为true。



例如

How to wait in a function until a boolean variable set to true.

for example

volatile bool fileSendingCompleted=false;
bool fileSentStatus=false;
bool sendfile()
{
//am calling a thread,from that thread timer will be called,so am going based on boolean variable.
while(fileSendingCompleted==false) ;//fileSendingCompletedwill be updated in thread
return fileSentStatus;//fileSentStatus will be updated in thread
}

如果我这样做，应用程序挂起，请告诉我如何等待在这个函数中。

If am doing like this, application getting hang,Please tell me how to wait in this function.

推荐答案

答案是不要使用 bool 来同步线程，使用 EventWaitHandle ，例如 AutoResetEvent 。



这显示如何一个线程c等待另一个：

The answer is don't use a bool to synchronize threads, use an EventWaitHandle, for example a AutoResetEvent.

This shows how one thread can be made to wait for another:

using System;
using System.Threading;
using System.Threading.Tasks;

namespace ThreadApplication {
    class Program {

        static void Main(string[] args) {

            var are = new AutoResetEvent(false);

            var producer = Task.Factory.StartNew(() => {
                Console.WriteLine("I am producer!");
                Thread.Sleep(1000);
                Console.WriteLine("Producer is done!");
                are.Set();
            });

            var consumer = Task.Factory.StartNew(() => {
                Console.WriteLine("I am consumer, I will wait for producer!");
                are.WaitOne();
                Console.WriteLine("Producer is done, so now consumer is done!");
            });

            Task.WaitAll(producer, consumer);
        }
    }
}

希望这会有所帮助，

Fredrik

Hope this helps,
Fredrik

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