C-如何在进程退出时关闭标准输入和输出流?

我有一个进程需要启动一个子进程,并通过标准的输入和输出与它进行通信。子进程应该能够自动终止自己;但是,我无法正确关闭流。

下面是来自child/“client”进程的相关代码:

// This is started in a separate thread
private void watchStandardInput() {
    string line = null;
    do {
        try {
            line = Console.ReadLine();
        } catch (IOException) {
            return;
        }
        lock (inputWatcher) {
            switch (line) {
                // process command
            }
        }
    } while (line != null);
}

// This is called from the main thread
private void updateStatus(string statusMessage) {
    lock (inputWatcher) {
        Console.WriteLine(statusMessage);
    }
}

下面是“服务器”代码:

// This is in the main thread
using (StreamReader sr = process.StandardOutput) {
    while (!process.HasExited) {
        processOutput(sr.ReadLine());
    }
}

// Finally, commands are sent in a separate thread.

现在,对于我遇到的问题:当子进程应该退出时,服务器将保持在 sr.ReadLine() 客户停留在 Console.ReadLine() . 我做错什么了?