What causes HttpPostedFileBase to fail on large files before reaching server-side validation?

When I disable client side validation 

<add key="ClientValidationEnabled" value="false" />
<add key="UnobtrusiveJavaScriptEnabled" value="false" />

and attempt to upload a file that is approximately 11 MB, which is then assigned to a HttpPostedFileBase member 

    [ValidateFile]
    public HttpPostedFileBase StudentImageFileBase { get; set; }

I am unable to trigger my custom validation code. Upon clicking the submit button, an error message pops up. Although client-side validation works fine, if it is disabled in the user's browser, how can I handle this situation? Shouldn't I be able to still allow uploads of large files and manage them server-side?

javascriptc#asp.net-mvchttppostedfilebase

Answer №1

For more information, please visit this link. To adjust your web.config file to allow for 1GB uploads, add the following code:

<system.webServer>
   <security>
      <requestFiltering>
         <requestLimits maxAllowedContentLength="1073741824" />
      </requestFiltering>
   </security>
 </system.webServer>

<configuration>
    <system.web>
        <httpRuntime maxRequestLength="1048576" />
    </system.web>
</configuration>

After making these changes, your application should now support file uploads up to 1GB and you can verify the size on the server side using the following code snippet:

public ActionResult Foo(HttpPostedFileBase file)
{
  ....
  if(file.ContentLength > 536870912) //512MB
     ....
  ....
}

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