问题描述

Console.WriteLine 会阻塞直到输出被写入还是立即返回?

Does Console.WriteLine block until the output has been written or does it return immediately?

如果确实阻塞了，是否有将异步输出写入控制台的方法?

If it does block is there a method of writing asynchronous output to the Console?

推荐答案

Console.WriteLine 是否阻塞直到输出已被写入或已完成立即返回?

Does Console.WriteLine block until the output has been written or does it return immediately?

是的.

如果它确实阻塞，是否有一种方法将异步输出写入控制台?

If it does block is there a method of writing asynchronous output to the Console?

如果您使用的是 .NET 4.0，那么在不阻塞的情况下写入控制台的解决方案非常简单.这个想法是将文本值排队并让一个专用线程执行 Console.WriteLine 调用.生产者-消费者模式在这里是理想的，因为它保留了使用原生 Console 类时隐含的时间顺序..NET 4.0 使这变得简单的原因是因为它具有 BlockingCollection促进生产者-消费者模式生产的类.如果您没有使用 .NET 4.0，那么您可以通过下载 Reactive Extensions 来获得反向移植 框架.

The solution to writing to the console without blocking is surprisingly trivial if you are using .NET 4.0. The idea is to queue up the text values and let a single dedicated thread do the Console.WriteLine calls. The producer-consumer pattern is ideal here because it preserves the temporal ordering that is implicit when using the native Console class. The reason why .NET 4.0 makes this easy is because it has the BlockingCollection class which facilitates the production of a producer-consumer pattern. If you are not using .NET 4.0 then you can get a backport by downloading the Reactive Extensions framework.

public static class NonBlockingConsole
{
  private static BlockingCollection<string> m_Queue = new BlockingCollection<string>();

  static NonBlockingConsole()
  {
    var thread = new Thread(
      () =>
      {
        while (true) Console.WriteLine(m_Queue.Take());
      });
    thread.IsBackground = true;
    thread.Start();
  }

  public static void WriteLine(string value)
  {
    m_Queue.Add(value);
  }
}

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