Why Does WaitForExit Stall When Redirecting Standard Output with Large Data Streams?

The problem of the large data stream standard output when the output of the large data streaming standard is redirected when the problem hanging by WaitForexit

When performing the process, it may encounter issues related to restrictions with

buffer. Specifically, when the deduction

, if the output size exceeds a certain threshold (such as 7MB), the program may be hung at an indefinite time during the ProcessStartInfo period. StandardOutput StandardOutput The reason WaitForExit

When the dependent and the internal buffer is full, this behavior will occur. If the call process is waiting for the target process before reading , the target process will be blocked when trying to write a full buffer area to prevent it from the end. Instead, if the call process uses retrieval output, if the target process is not turned off (for example, if it does not end or its

stream is blocked), it may be blocked.

StandardOutput Solution StandardOutput ReadToEnd StandardOutput In order to solve this problem, use asynchronous reading to prevent the buffer from achieving capacity. The following code example demonstrates how to perform this operation: StandardError

This solution uses asynchronous callback to process data received from and to ensure that the internal buffer zone will not be full and prevent dead locks.

Note:

In order to avoid

using (Process process = new Process())
{
    process.StartInfo.FileName = filename;
    process.StartInfo.Arguments = arguments;
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.RedirectStandardError = true;

    StringBuilder output = new StringBuilder();
    StringBuilder error = new StringBuilder();

    using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
    using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
    {
        process.OutputDataReceived += (sender, e) => {
            if (e.Data == null)
            {
                outputWaitHandle.Set();
            }
            else
            {
                output.AppendLine(e.Data);
            }
        };
        process.ErrorDataReceived += (sender, e) =>
        {
            if (e.Data == null)
            {
                errorWaitHandle.Set();
            }
            else
            {
                error.AppendLine(e.Data);
            }
        };

        process.Start();

        process.BeginOutputReadLine();
        process.BeginErrorReadLine();

        if (process.WaitForExit(timeout) &&
            outputWaitHandle.WaitOne(timeout) &&
            errorWaitHandle.WaitOne(timeout))
        {
            // 进程已完成。在此处检查 process.ExitCode。
        }
        else
        {
            // 超时。
        }
    }
}

when occurred at time, check the

property of the process before the output of the access process or the error flow. StandardOutput

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