Request.Content.ReadAsMultipartAsync never returns

by

I ran into something similar in .NET 4.0 (no async/await). Using the debugger’s Thread stack I could tell that ReadAsMultipartAsync was launching the task onto the same thread, so it would deadlock. I did something like this:

IEnumerable<HttpContent> parts = null;
Task.Factory
    .StartNew(() => parts = Request.Content.ReadAsMultipartAsync().Result.Contents,
        CancellationToken.None,
        TaskCreationOptions.LongRunning, // guarantees separate thread
        TaskScheduler.Default)
    .Wait();

The TaskCreationOptions.LongRunning parameter was key for me because without it, the call would continue to launch the task onto the same thread. You could try using something like the following pseudocode to see if it works for you in C# 5.0: 

await TaskEx.Run(async() => await Request.Content.ReadAsMultipartAsync(provider))

More Related Contents:

  1. How do you implement an async action delegate method?
  2. An async/await example that causes a deadlock
  3. WCF vs ASP.NET Web API [closed]
  4. Does the use of async/await create a new thread?
  5. Best practice to return errors in ASP.NET Web API
  6. Is there any async equivalent of Process.Start?
  7. Single controller with multiple GET methods in ASP.NET Web API
  8. How to read request body in an asp.net core webapi controller?
  9. Why should I use IHttpActionResult instead of HttpResponseMessage?
  10. Entity framework self referencing loop detected [duplicate]
  11. 405 method not allowed Web API
  12. Routing with multiple Get methods in ASP.NET Web API
  13. ASP.NET WebApi: how to perform a multipart post with file upload using WebApi HttpClient
  14. Async implementation of IValueConverter
  15. Multiple Controller Types with same Route prefix ASP.NET Web Api
  16. Post byte array to Web API server using HttpClient
  17. Using async without await?
  18. Asp.net WEB API – What problems could arise if I use POST instead of PUT and DELETE?
  19. Put content in HttpResponseMessage object?
  20. Strings sent through Web API’s gets wrapped in quotes
  21. Return Json, but it includes backward slashes “\”, which I don’t want
  22. What’s the difference between WCF Web API and ASP.NET Web API
  23. Web Api Request Content is empty in action filter
  24. Can’t await async extension method
  25. call async method without await #2
  26. How to Upload Image Via WebApi
  27. Changing the parameter name Web Api model binding
  28. JSON Deserialization – String Is Automatically Converted To Int
  29. Generic Web Api controller to support any model
  30. How to get hold of Content that is already read

Leave a Comment