MultipartFormDataStreamProvider无法读取Stream

Question

我在asp.net中使用上传功能并执行此操作

string root = HostingEnvironment.MapPath("~/App_Data");
string imageName = "";
var streamProvider = new MultipartFormDataStreamProvider(root);
try
{
    await Request.Content.ReadAsMultipartAsync(streamProvider); // error "Error reading MIME multipart body part." + Cannot access a disposed object.
 .... more code

我确定我为App_Data文件夹提供了完全权限，但仍然收到此错误。任何身体可以帮助我吗？

顺便说一下，我已经开始了

  

maxAllowedContentLength =＆＃34; 524288000＆＃34; /＆GT;