Question

我使用PostSharp LogAttribute和log4net为所有被调用的方法生成跟踪。

输出很好，但我想在每一行上摆脱重复的标签Entering:：

17:48:34,694 [Main      ]       Entering: LoginPopUp.LoginClick() 
17:48:34,695 [Main      ]         Entering: UserRepository.GetUser() 
17:48:34,695 [Main      ]           Entering: UserRepository.IsAdmin() 
17:48:34,696 [Main      ]             Entering: SecurityManager.Encrypt()

从this answer开始，PostSharp团队显然不会添加消息格式自定义。

还有一个自定义TraceAttribute derived from OnMethodBoundaryAspect的示例而且定制似乎更灵活。但问题是，在这种情况下，我会丢失显示嵌套级别的缩进（这对我来说比在每一行上输入单词更重要）。

最好的解决方案是扩展LogAttribute只是为了自定义前缀，但我不知道是否可能。

那么如何删除Entering:前缀？

基于彼得答案的工作代码

    static readonly Dictionary<Thread, int> DepthDictionary = new Dictionary<Thread, int>();

    // Invoked at runtime before that target method is invoked.
    public override void OnEntry(MethodExecutionArgs args)
    {
        int depth;
        DepthDictionary.TryGetValue(Thread.CurrentThread, out depth);
        Trace.WriteLine(getIndent(depth) + this.enteringMessage, this.category);
        DepthDictionary[Thread.CurrentThread] = depth+1;
    }

    // Invoked at runtime after the target method is invoked (in a finally block).
    public override void OnExit(MethodExecutionArgs args)
    {
        var depth = --DepthDictionary[Thread.CurrentThread];
        Trace.WriteLine(getIndent(depth) + this.exitingMessage, this.category);
    }

    private string getIndent(int depth)
    {
        string result = "";
        for (int i = 0; i < depth; i++) result += "    ";
        return result;
    }

Answer 1

当您的解决方案不是多线程时，您只需添加自己的身份：

    // Invoked only once at runtime from the static constructor of type declaring the target method.
    public override void RuntimeInitialize(MethodBase method)
    {
        string methodName = method.DeclaringType.FullName + method.Name;
        this.enteringMessage = methodName;
        this.exitingMessage = methodName;
    }

    static int depth = 0; 

    // Invoked at runtime before that target method is invoked.
    public override void OnEntry(MethodExecutionArgs args)
    {
        Trace.WriteLine(getIndent()+this.enteringMessage, this.category);
        depth++;
    }

    // Invoked at runtime after the target method is invoked (in a finally block).
    public override void OnExit(MethodExecutionArgs args)
    {
        depth--;
        Trace.WriteLine(getIndent()+this.exitingMessage, this.category);
    }

    private string getIndent(){
        string result = "";
        for (int i = 0; i < depth;i++) result += "    ";
        return result;
    }

example-trace

Answer 2

可以在log4net自定义PatternLayoutConverter中使用string.Replace删除它，但它似乎不是最好的解决方案。

基于自定义TraceAttribute提供解决方案会很棒。

删除PostSharp日志消息中的前缀

2 个答案: