读标准 output 不漏 memory

Question

如何在不泄漏memory的情况下读取标准output？ p.StandardOutput.ReadToEnd(); 在大 output 上是错误的选择，因为它在 SOH 中分配了大量的字符。

// Start the child process.
Process p = new Process();
// Redirect the output stream of the child process.
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = "Write500Lines.exe";
p.Start();
**string output = p.StandardOutput.ReadToEnd();**
p.WaitForExit();

Answer 1

Process.StandardOutput 是一个StreamReader ，可以逐行读取内容保存 memory：

// Keep looping lines while stream has not ended
while (!p.StandardOutput.EndOfStream)
{
    // Read a single line
    var line = p.StandardOutput.ReadLine();

    // ... Do something with the line
}

Answer 2

您可以使用process.OutputDataReceived事件处理程序捕获 output，并让进程通知您的应用程序接收 output。 它甚至适用于提示用户输入的进程：

    Process process = new Process();
    process.StartInfo.FileName = "ipconfig.exe";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.OutputDataReceived += new DataReceivedEventHandler((sender, e) =>
    {
        // Prepend line numbers to each line of the output.
        if (!String.IsNullOrEmpty(e.Data))
        {
            lineCount++;
            output.Append("\n[" + lineCount + "]: " + e.Data);
        }
    });

    process.Start();

    // Asynchronously read the standard output of the spawned process.
    // This raises OutputDataReceived events for each line of output.
    process.BeginOutputReadLine();
    process.WaitForExit();

    // Write the redirected output to this application's window.
    Console.WriteLine(output);

    process.WaitForExit();
    process.Close();

    Console.WriteLine("\n\nPress any key to exit.");
    Console.ReadLine();

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