.NET 4.5 HttpTaskAsyncHandler uploads file

Question

I am trying to figure out how to use the new asp.net 4.5 async handlers as well as Request.GetBufferlessInputStream to write an image to disk. This code runs and it writes the file, but the image is corrupted, and I'm not sure why. Here is the code I'm using

public class UploadHandler : HttpTaskAsyncHandler { public override Task ProcessRequestAsync(HttpContext context) { // Gets a Stream object that can be used to read the // incoming HTTP entity body, optionally disabling the // request-length limit that is set in the MaxRequestLength property. // This method provides an alternative to using the // InputStream property. The InputStream property waits until the // whole request has been received before it returns a Stream object. // In contrast, the GetBufferlessInputStream method returns // the Stream object immediately. // You can use the method to begin processing the // entity body before the complete contents of the // body have been received. // The entity body (or as much of it as you request and has // been received) is returned only when you use the object that // is returned by this method to read the stream, by calling // methods such as the Read method. You use parameters of the // Read method to specify how much of the entity body to read. // This method can be useful if the request is uploading a // large file and you want to begin accessing the file contents // before the upload is finished. // However, you should only use this method for scenarios where // you want to take over all processing of the entity body. // This means that you cannot use this method from an .aspx page, // because by the time an .aspx page runs, the entity body // has already been read. using (Stream input = context.Request.GetBufferlessInputStream(true)) using (var file = new FileStream("C:\\myfile.jpg", FileMode.Create, FileAccess.Write, FileShare.Write)) { input.CopyTo(file); } context.Response.ContentType = "text/plain"; return context.Response.Output.WriteAsync("Done"); } } 

Answer 1

Well, there seems to be an easy way to handle this now using ASP.NET Web Api!

Read about it here: http://blogs.msdn.com/b/henrikn/archive/2012/03/01/file-upload-and-asp-net-web-api.aspx

Use one of these bad guys MultipartFormDataStreamProvider

Answer 2

Not really trying to get the code out, I noticed one thing. Should your Response.ContentType = image/gif stream be a BinaryStream instead of a regular stream, since this is the image you are working with.?