ASP.NET - 如何显示错误页面在上传大文件时（最大请求长度超过了）？ [英] ASP.NET - how to show a error page when uploading big file (Maximum request length exceeded)?
问题描述
应用程序能够在的OnError记录错误，但我们无法做任何重定向左右，显示一些meaningfull用户。 有任何想法吗？ 我知道，我们可以在web.config中设置maxRequestLength的，但无论如何，用户可以超过这个限制，一些正常的错误需要显示。
Application able to record error in OnError, but we are not able to do any redirect or so to show something meaningfull to user. Any ideas? I know that we can set maxRequestLength in web.config, but anyway user can exceed this limit and some normal error need to be displayed.
推荐答案
正如你所说的，你可以在你的web.config中设置了maxRequestLength（重写你的machine.config中的默认4MB），如果这种限制被超过，你通常可以得到HTTP 401.1错误。
As you say you can setup maxRequestLength in your web.config (overriding the default 4MB of your machine.config) and if this limits is exceeded you usually get a HTTP 401.1 error.
为了处理在应用程序级的通用的HTTP错误，您可以设置system.web节内你的web.config一个CustomError部分：
In order to handle a generic HTTP error at application level you can setup a CustomError section in your web.config within the system.web section:
<system.web>
<customErrors mode=On defaultRedirect=yourCustomErrorPage.aspx />
</system.web>
每次错误是显示用户将被重定向到您的自定义错误页。
Everytime the error is showed the user will be redirected to your custom error page.
如果你想为每个错误，你可以这样做一个专门的页面：
If you want a specialized page for each error you can do something like:
<system.web>
<customErrors mode="On" defaultRedirect="yourCustomErrorPage.aspx">
<error statusCode="404" redirect="PageNotFound.aspx" />
</customErrors>
</system.web>
等等。
另外，您可以编辑从IIS虚拟目录属性的customErrors标签以指向您选择的错误处理页面。
Alternatively you could edit the CustomErrors tab of your virtual directory properties from IIS to point to your error handling pages of choice.
以上似乎不工作401.x错误 - 这code-项目文章解释了一种变通方法的什么似乎是一个非常类似的问题：的重定向到自定义401页
The above doesn't seem to work for 401.x errors - this code-project article explains a workaround for a what seems to be a very similar problem: Redirecting to custom 401 page
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