C# .net 4.0 Upload a file to .asp Web API

Question

My .net 4.0 class library send HttpRequestMessage and receive HttpResponseMessage from .asp Web API (REST).

When I sent a small class, I use JSON to parse it as string, then I send string by:

request = new HttpRequestMessage();
request.RequestUri = new Uri(myRestAPI);
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
request.Method = method;
if (method != HttpMethod.Get)
   request.Content = new StringContent(content, Encoding.UTF8, mthv);

Next, use HttpClient to send it:

using (HttpResponseMessage httpResponse = _client.SendAsync(request).Result)
{..}

This works fine.
Now, my class has got bigger, How can i send it ?
What i did was to zip it and send as ByteArrayContent.

request = new HttpRequestMessage();
request.RequestUri = new Uri(url);
request.Method = method;
if (method != HttpMethod.Get)
   request.Content = new ByteArrayContent(content);
   request.Content.Headers.ContentType = new MediaTypeHeaderValue("multipart/form-data");

And send it the same way.

But now the server does reply me with error:

No MediaTypeFormatter is available to read an object of type 'Byte[]' from content with media type 'multipart/form-data'.

What am I doing wrong ?? I am trying to find a proper guide and all the guides are talking about uploading FROM web api and not about uploading from application to web api..

ByteArrayContent sends the media type application/octet-stream. If you really wanted to send multipart form data then you would use the MultiPartFormDataContent class. Either way, you shouldn't be changing the content-type just because you want to compress. That's why there is a separate content-encoding header. — Darrel Miller
– Darrel Miller, Commented Sep 11, 2013 at 14:01

Darrel Miller · Accepted Answer · 2013-09-11 13:59:18Z

3

Go get WebAPIContrib, it has a CompressedContent class

With it you can do,

request.Content = new CompressedContent(new StringContent(content, Encoding.UTF8, mthv),"gzip");

and compression will just magically just happen.

answered Sep 11, 2013 at 13:59

Darrel Miller

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4 Comments

ilansch Over a year ago

Hi, is this valid for .net 4.0 ? When i receive it on my Controller, Do I do the same as before ? - before i just had the object as input parameter in (..[FromBody] mySerializedClass..)

Darrel Miller Over a year ago

@ilansch That class works fine in .net 4. As far as decompressing on the server. I think IIS will do it automatically, however, if you are on self host you might need a MessageHandler.

Darrel Miller Over a year ago

@ilansch The GZipStream class can decompress as well as compress. There is an example of how to do it here github.com/WebApiContrib/WebAPIContrib/blob/master/src/…

ilansch Over a year ago

I was trying what you said, i receive null in my controller: [HttpPut] public HttpResponseMessage UpdateStatus([FromBody]MyClass systemBase, [FromUri]string systemId, [FromUri]string af = "") {

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