捕获“超出最大请求长度"

问题描述

我正在编写一个上传函数，并且在捕获System.Web.HttpException:最大请求长度超出"时遇到问题，文件大于 web.config 中 httpRuntime 中指定的最大大小(最大大小设置为 5120).我正在为文件使用一个简单的 .

I'm writing an upload function, and have problems catching "System.Web.HttpException: Maximum request length exceeded" with files larger than the specified max size in httpRuntimein web.config (max size set to 5120). I'm using a simple <input> for the file.

问题是在上传按钮的点击事件之前抛出异常，并且在我的代码运行之前发生异常.那么我该如何捕捉和处理异常呢?

The problem is that the exception is thrown before the upload button's click-event, and the exception happens before my code is run. So how do I catch and handle the exception?

异常立即抛出，所以我很确定这不是由于连接缓慢导致的超时问题.

The exception is thrown instantly, so I'm pretty sure it's not a timeout issue due to slow connections.

推荐答案

不幸的是，没有简单的方法可以捕获此类异常.我所做的是在页面级别覆盖 OnError 方法或 global.asax 中的 Application_Error，然后检查它是否是最大请求失败，如果是，则转移到错误页面.

There is no easy way to catch such exception unfortunately. What I do is either override the OnError method at the page level or the Application_Error in global.asax, then check if it was a Max Request failure and, if so, transfer to an error page.

protected override void OnError(EventArgs e) .....


private void Application_Error(object sender, EventArgs e)
{
    if (GlobalHelper.IsMaxRequestExceededException(this.Server.GetLastError()))
    {
        this.Server.ClearError();
        this.Server.Transfer("~/error/UploadTooLarge.aspx");
    }
}

这是一个黑客，但下面的代码对我有用

It's a hack but the code below works for me

const int TimedOutExceptionCode = -2147467259;
public static bool IsMaxRequestExceededException(Exception e)
{
    // unhandled errors = caught at global.ascx level
    // http exception = caught at page level

    Exception main;
    var unhandled = e as HttpUnhandledException;

    if (unhandled != null && unhandled.ErrorCode == TimedOutExceptionCode)
    {
        main = unhandled.InnerException;
    }
    else
    {
        main = e;
    }


    var http = main as HttpException;

    if (http != null && http.ErrorCode == TimedOutExceptionCode)
    {
        // hack: no real method of identifying if the error is max request exceeded as
        // it is treated as a timeout exception
        if (http.StackTrace.Contains("GetEntireRawContent"))
        {
            // MAX REQUEST HAS BEEN EXCEEDED
            return true;
        }
    }

    return false;
}

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