log4net支持包括日志消息中的调用堆栈 [英] Does log4net support including the call stack in a log message

问题描述

我希望在log4net消息中包含调用堆栈（例如调用我的方法）。有没有一个标准的方法？

I wish to include the call stack (e.g. the methods that called me) in a log4net message. Is there a standard way of doing this?

（我知道这会很慢，但我只需要在一些错误上做）

(I know this will be slow, but I only need to do it on some errors)

推荐答案

是 - 您可以使用模式布局中的以下模式获取此堆栈信息：

Yes - you can get this stack information using the following patterns in a pattern layout:

%type %file %line %method %location %class

有关详细信息，请参阅PatternLayout上的此文档。

See the this documentation on the PatternLayout for more information.

对Ian的评论进行编辑：我不认为 log4net可以配置为写出整个堆栈。

Edit in response to Ian's comment below: I don't think log4net can be configured to write out the whole stack.

您可以随时使用类似新的StackTrace（）这样的东西写回来。ToString（），但我猜你问的原因是你希望这可以在日志配置中进行配置。

You can always fall back on writing it out for yourself, using something like new StackTrace().ToString(), but I'm guessing the reason you ask is you want this to be configurable in the logging configuration.

我会深入一下，b我的直觉感觉是没有办法配置这个，你最终必须实现自己的Layout类。

I'll have a deeper look, but my gut feeling is there is no way to configure this, and that you'd end up having to implement your own Layout class.

编辑++
OK - 这是一个自定义模式布局类，它从 PatternLayout 派生，但添加了一个布局％堆栈。

Edit++ OK - here is a custom pattern layout class that derives from PatternLayout but adds in a layout %stack.

这段代码有点粗糙 - 只是说明性的 - 没有生产就绪！ （例如，您可能没有访问要打印的堆栈的安全权限）

This code is a bit rough - illustrative only - not production ready! (for example, you may not have security permission to access the stack you are trying to print)

public class CustomPatternLayout : PatternLayout
{
    public CustomPatternLayout()
    {
        this.AddConverter("stack", typeof(StackTraceConverter));
    }
}

public class StackTraceConverter : PatternLayoutConverter
{
    protected override void Convert(TextWriter writer, LoggingEvent loggingEvent)
    {
        var stack = new StackTrace();

        var frames = stack.GetFrames();
        for (var i = 0; i < frames.Length; i++ )
        {
            var frame = frames[i];

            // if the stack frame corresponds to still being inside the log4net assembly, skip it.
            if (frame.GetMethod().DeclaringType.Assembly != typeof(LogManager).Assembly)
            {
                writer.WriteLine("{0}.{1} line {2}",
                    frame.GetMethod().DeclaringType.FullName,
                    frame.GetMethod().Name, 
                    frame.GetFileLineNumber());
            }
        }
    }
}

可以使用以下模式配置进行配置（在布局的末尾注意％stack）：

You can then configure this with the following pattern configuration (note %stack at the end of the layout):

  <layout type="ScratchPad.CustomPatternLayout,ScratchPad">
    <conversionPattern value="%date %-5level %message%newline %type %file %line %method %location %class %stack" />
  </layout>

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