如何美元的一个错误处理的属性$ p ELMAH pvent记录错误 [英] How to prevent Elmah logging errors handled in a Error Attribute

问题描述

我使用了asp.net，mvc4 web应用程序ELMAH和Elmah.mvc包。我有，我想处理 HttpAntiForgeryExceptions 以特定方式特定的控制器动作。我创建了一个自定义的HandleErrorAttribute从 HandleErrorAttribute 继承并实施个IExceptionFilter 。

I am using Elmah and Elmah.mvc packages in a asp.net, mvc4 web app. I have a specific controller action where I want to handle HttpAntiForgeryExceptions in a specific manner. I have created a custom HandleErrorAttribute that inherits from HandleErrorAttribute and implements IExceptionFilter.

在我要处理的具体情况，我设置了 ExceptionContext.ExceptionHandled 为true。用户看到的行为是正确的，错误处理，我希望它是。然而，它也记录一个错误ELMAH，我不希望它做的，因为我想保持ELMAH日志真正的错误。

Under the specific circumstances I want to handle, I set the ExceptionContext.ExceptionHandled to true. The behaviour that the user sees is correct and the error is handled as I want it to be. However, it also logs an error to Elmah, which I don't want it to do, as I would like to keep the Elmah log for true errors.

控制器注解如下：

[ValidateAntiForgeryToken]
[CustomHandleAntiforgeryError]
public ActionResult ControllerMethod(Model model) 
{ 
    ... 
}

该CustomHandleAntiforgeryError如下：

The CustomHandleAntiforgeryError looks like:

public class CustomHandleAntiforgeryErrorAttribute: 
                              HandleErrorAttribute, IExceptionFilter 
{
    public override void OnException(ExceptionContext filterContext)
    {
        if (circumstancesAreOk) 
        {
            filterContext.ExceptionHandled = true;
            return;
        }
    }
}

还有什么我需要做的prevent这个错误被记录与ELMAH？

Is there anything else I need to do to prevent this error being logged with Elmah?

---编辑---

综观Elmah.MVC源<一个href=\"https://github.com/alexanderbeletsky/elmah-mvc/blob/master/src/Elmah.Mvc/HandleErrorAttribute.cs\"相对=nofollow> HandleErrorAttribute 同时记录处理和未处理的错误

Looking at the Elmah.MVC source the HandleErrorAttribute logs both handled and unhandled errors

public override void OnException(ExceptionContext context)
    {
        base.OnException(context);

        if (!context.ExceptionHandled) // if unhandled, will be logged anyhow
            return;

        var e = context.Exception;
        var httpContext = context.HttpContext.ApplicationInstance.Context;
        if (httpContext != null && 
            (RaiseErrorSignal(e, httpContext) // prefer signaling, if possible
             || IsFiltered(e, httpContext))) // filtered?
            return;

        LogException(e, httpContext);
    }

我想我的自定义内的方式属性来通知ELMAH不会记录这个错误，并会AP preciate任何想法。

I would like a way within my custom attribute to signal to Elmah not to log this error and would appreciate any ideas.

推荐答案

我做了什么来解决这个问题，我认为是丑陋的，但我是经历了奇怪的错误过滤器角落的情况下工作。我添加了一个自定义的HandleErrorAttribute，从ELMAH <复制的href=\"https://github.com/alexanderbeletsky/elmah-mvc/blob/master/src/Elmah.Mvc/HandleErrorAttribute.cs\"相对=nofollow> HandleErrorAttribute 并列入onException的方法空检查。

What I did to solve this I think is ugly, but worked for the weird error filter corner case that I was experiencing. I added a custom HandleErrorAttribute, copied from the Elmah HandleErrorAttribute and included a null check in the OnException method.

    public override void OnException(ExceptionContext context)
    {
        base.OnException(context);

        if (!context.ExceptionHandled) // if unhandled, will be logged anyhow
            return;

        string[] formKeys = context.HttpContext.Request.Form.AllKeys;

        var e = context.Exception;

        // linked to CustomErrorAttribute
        if (e == null)
        {
            return;
        }

        bool test = HostingEnvironment.IsHosted;

        var httpContext = context.HttpContext.ApplicationInstance.Context;
        if (httpContext != null &&
            (RaiseErrorSignal(e, httpContext) // prefer signaling, if possible
             || IsFiltered(e, httpContext))) // filtered?
            return;

        LogException(e, httpContext);
    }

然后，在我的错误过滤器，这是我不想触发短信到ELMAH，还有ExceptionContext ExceptionHandled设置为true，我设置的例外为空

Then, in my error filter, which I did not want to trigger messaging to Elmah, as well as setting the ExceptionContext ExceptionHandled to true I set the Exception to null

public class MyCustomErrorFilter : IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
         if (blah, blah, blah, weird things but not something terrible) 
         {
            filterContext.Exception = null;
            filterContext.ExceptionHandled = true;
            return;
         }
     }
 }

如果这是一件非常棘手且经常发生，我可能会叉ELMAH，并期待在创建自定义ELMAH建设成为本哈克的感觉一点点地依赖于多种情况。

If it was something more involved and a regular occurrence I would probably fork Elmah and look at creating a custom Elmah build as this feels a little bit hacky to rely on in multiple situations.

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