将log4net添加到动态生成的C#代码中 [英] Add log4net to C# code generated dynamically

问题描述

我们有使用CodeDom编译成库的代码. 在其中一些类中，我想添加log4net语句.

We have code that gets compiled into a library using CodeDom. In some of these classes I would like to add log4net statements.

我不确定将以下行添加到将动态编译的代码中的语法(以便稍后可以在类中使用log对象):

I am not sure about the syntax to add the following line (so that I can use the log object for logs later in the class) into the code that will be compiled dynamically :

 private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

到目前为止，我在构建代码的类中具有以下内容:

So far I have the following in the class that builds the code:

//create log4net entry
        CodeMemberField log4netField = new CodeMemberField(typeof(log4net.ILog), "log");
        log4netField.Attributes = MemberAttributes.Static | MemberAttributes.Private;

然后我应该使用InitExpression吗?如:

Should I then use InitExpression? As in:

log4netField.InitExpression = new CodePrimitiveExpression();

我似乎找不到作为声明的一部分为字段分配值的方法，也没有找到将其声明为只读状态的方法.

I can't seem to find how to assign a value to a field as part of the declaration, and I also don't find how I can state it as readonly.

这对您有所帮助: MSDN ，但没有我需要的所有示例.

This has been of some help: MSDN, but it doesn't have examples of everything that I need.

所以，我的主要问题是如何添加它:

So, my main problem is how to add this:

log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

我对CodeDom不太了解，但是我怀疑如果将其添加为字符串可能无法正常工作?

I do not know a lot about CodeDom, but I suspect something might not work if I add it as a string?

推荐答案

您可以在核心组件中返回ILog的方法中声明以下内容:

You could declare the following in a method that returns ILog in your core components:

 return LogManager.GetLogger(new StackTrace().GetFrames()[1].GetMethod().DeclaringType);

然后在像这样动态编译的代码中获取其实例:

And then obtain an instance thereof in the code that gets dynamically compiled like so:

var log = Log.Get();

这样，无论您的代码是通过CodeDom动态编译还是从一开始就在其中，您都将最终获得调用类型的日志记录实例，而不必使用Reflection.

That way, regardless of whether your code is dynamically compiled in via the CodeDom or was in there from the start, you'll always end up with a logging instance for the calling type without having to use Reflection.

我已经在整个代码中使用这种实现近一年了，甚至使用动态编译插件的项目也可以以这种方式处理日志记录，而没有任何明显的副作用.

I've been using this implementation throughout my code for almost a year now, and even projects that use dynamically compiled plugins can handle logging this way without any noticeable side effects.

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