Uploading Stream/Images to REST API Using RestSharp

While I was working with the REST API to upload an image using RestSharp, I encountered a problem uploading it. I Googled the problem but did not find a specific answer for it. Although I found the solution and thought to share it since it can save a lot of time for other developers. I am assuming here that the reader is familiar with the REST API and RestSharp.

[OperationContract]
[WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
public void NotesAttachment(Stream input)
{
    HttpApplicationState Application = HttpContext.Current.Application;
    HttpRequest Request = HttpContext.Current.Request;
    string sRequest = String.Empty;
    using (StreamReader stmRequest = new StreamReader(input, System.Text.Encoding.UTF8))
    {
        sRequest = stmRequest.ReadToEnd();
    }
    JavaScriptSerializer json = new JavaScriptSerializer();
    json.MaxJsonLength = int.MaxValue;
    Dictionary<string, object> dict = json.Deserialize<Dictionary<string, object>>(sRequest);
    string ext = dict["FILE_EXT"] as string;
    string mime = dict["FILE_MIME_TYPE"] as string;
    string image = dict["IMAGE_DATA"] as string;
    byte[] attachment = Convert.FromBase64String(image);
}

What this method (the WS method) is expecting is a Stream object containing a file extension, file mime type and file data as an encoded string that is being converted to a byte array.

JavaScriptSerializer used in the example above is System.Web.Script.Serialization from systems.web.extension.dll.

This is how it is called from the client, I am using WPF as the client, but it can be called from a console or web app.

private void CallRestNotesAttachment(string ext, string mime)
{
      var restClient = new RestClient("http://localhost:1608/Rest.svc/NotesAttachment");
      restClient.AddHandler("application/octet-stream", new RestSharp.Deserializers.JsonDeserializer());
      var request = new RestRequest(Method.POST);
      request.AddHeader("Content-Type", "application/octet-stream");
      Dictionary<string, object> dict = new Dictionary<string, object>();
      dict.Add("FILE_EXT", ext);
      dict.Add("FILE_MIME_TYPE", mime);
      byte[] imageBytes;
      using (FileStream fs = File.Open(@"C:\Users\anand.thakur\Desktop\1.wmv", FileMode.Open))
      {
          imageBytes = new BinaryReader(fs).ReadBytes((int)fs.Length);
      }
      string image = Convert.ToBase64String(imageBytes);
      dict.Add("IMAGE_DATA", image);
      byte[] data = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(dict));
      request.AddParameter("application/octet-stream", data, ParameterType.RequestBody);
      var response = restClient.Execute(request);
      JavaScriptSerializer json = new JavaScriptSerializer();
      Dictionary<string, object> dict1 = json.Deserialize<Dictionary<string, object>>(response.Content);
      MessageBox.Show("done");
  }

The RestSharp package is available through NuGet. JsonConvert can be found in Newtonsoft.Json, that is also available at NuGet.