Debug.WriteLine不工作

问题描述

在过去，或许现在使用的2008年之前的Visual Studio版本，我会在VB.NET代码中做这样的事情：

In the past, perhaps versions of Visual Studio prior to the 2008 that I am using now, I would do something like this in my VB.NET code:

System.Diagnostics.Debug.WriteLine("Message")

..并且输出将转到输出窗口。

..and the output would go to the output window.

现在没有。必须首先显示某些东西。

Now it doesn't. Something must first apparently be enabled.

如果这涉及到附加调试器，请说明如何做。在我看来，它应该没有太大的惊喜。

If this involves "attaching a debugger", please explain how to do it. It seems to me that it should just work without too much of a fuss.

这是一个实时解释问题的视频，并显示所有我的设置：

Here's a video explaining the issue in real time and showing you all my settings:

http://screencast.com/t/YQnPb0mJcs

我正在使用Visual  Studio  2008。

I'm using Visual Studio 2008.

推荐答案

所有好的建议我注意到我没有看到这个提示，所以我会说：在你的app.config文件中，确保你没有一个< clear /> 元素。

All good suggestions. I noticed that I don't see this tip mentioned, so I'll say it: In your app.config file, make sure you don't have a <clear/> element in your trace listeners.

您将有效地清除跟踪侦听器的列表，包括默认的跟踪侦听器用于调试语句。

You will effectively be clearing the list of trace listeners, including the default trace listener used for Debug statements.

这是您的app.config文件中的内容：

Here's what this would look like in your app.config file:

<system.diagnostics>
    <trace>
      <listeners>
          <!-- This next line is the troublemaker.  It looks so innocent -->
          <clear/>
      </listeners>
    </trace>
  </system.diagnostics>

如果你想在你的app.config文件中有跟踪监听器的占位符，你应该改用如下所示：

If you want to have a placeholder for trace listeners in your app.config file, you should instead use something like this:

<system.diagnostics>
    <trace>
      <listeners>
      </listeners>
    </trace>
  </system.diagnostics>

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