异步进程启动并等待它完成 [英] Async process start and wait for it to finish

问题描述

我是新来在.NET中的线程模型。你会用什么：

I am new to the thread model in .net. What would you use to:

1. 在开始处理一个文件（process.StartInfo.FileName =文件名;）过程
2. 等待用户一段时间后，关闭程序或放弃线程
3. 如果用户关闭了进程，删除文件

启动过程，并等待应做不同的线程比主线程，因为此操作不会影响应用程序。

Starting the process and waiting should be done on a different thread than the main thread, because this operation should not affect the application.

例如：

我的应用程序生成的HTML报告。用户可以用鼠标点击的地方，并说查看报告 - 现在我检索报告的内容在一个临时文件并启动处理HTML文件即默认浏览器的进程。问题是，我不能清理，即删除临时文件。

My application produces an html report. The user can right click somewhere and say "View Report" - now I retrieve the report contents in a temporary file and launch the process that handles html files i.e. the default browser. The problem is that I cannot cleanup, i.e. delete the temp file.

推荐答案

，并等待一定是异步 - 我不是在开玩笑，但不是在这方面有矛盾？但是，因为你开始一个进程的已退出事件可能会有所帮助：

"and waiting must be async" - I'm not trying to be funny, but isn't that a contradiction in terms? However, since you are starting a Process, the Exited event may help:

ProcessStartInfo startInfo = null;
Process process = Process.Start(startInfo);
process.EnableRaisingEvents = true;
process.Exited += delegate {/* clean up*/};

如果你想真正等待（超时等），则：

If you want to actually wait (timeout etc), then:

if(process.WaitForExit(timeout)) {
    // user exited
} else {
    // timeout (perhaps process.Kill();)
} 

有关异步等待，或许只是使用一个不同的线程？

For waiting async, perhaps just use a different thread?

ThreadPool.QueueUserWorkItem(delegate {
    Process process = Process.Start(startInfo);
    if(process.WaitForExit(timeout)) {
        // user exited
    } else {
        // timeout
    }
});

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