Question

1 namespace Uploader   2 {   3     using System;   4     using System.IO;   5     using System.ServiceModel;   6     using System.ServiceModel.Description;   7     using System.ServiceModel.Web;   8     using System.Drawing;   9     using System.Drawing.Imaging;   10     using System.Net;   11     using System.Xml;   12    13     [ServiceContract(Namespace = 'http://Uploader')]   14     public interface IUploaderService   15     {   16         [OperationContract, WebInvoke(Method = 'POST',UriTemplate = 'File/{fileName}')]   17         bool UploadFile(string fileName, Stream fileContents);   18     }   19    20     [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]   21     public class UploaderService : IUploaderService   22     {   23         public bool UploadFile(string fileName, Stream fileContents)   24         {   25             return true;   26         }   27     }   28    29     class Program   30     {   31         static void Main()   32         {   33             var host = new    34                 ServiceHost(typeof (UploaderService),    35                 new Uri('http://localhost:8080/Uploader'));   36             host.AddServiceEndpoint('Uploader.IUploaderService',    37                 new WebHttpBinding(), '').Behaviors.Add(new WebHttpBehavior());   38             try   39             {   40                 host.Open();   41                 Console.WriteLine(host.BaseAddresses[0].AbsoluteUri + ' running.');   42                 Console.WriteLine();   43                 var uri = 'http://localhost:8080/Uploader/file.jpg';   44                 var req = WebRequest.Create(uri) as HttpWebRequest;   45                 if (req != null)   46                 {   47                     req.Method = 'POST';   48                     req.ContentType = 'image/jpeg';   49                     var reqStream = req.GetRequestStream();   50                    51                     var imageStream = new MemoryStream();   52                     using (var i = Image.FromFile(@'c:\photo.jpg'))    53                         i.Save(imageStream, ImageFormat.Jpeg);   54                        55                     var imageArray = imageStream.ToArray();   56                     reqStream.Write(imageArray, 0, imageArray.Length);   57                     reqStream.Close();   58                     var resp = (HttpWebResponse)req.GetResponse();   59                     var r = new XmlTextReader(resp.GetResponseStream());   60                     if (r.Read())   61                     {   62                         Console.WriteLine(r.ReadString());       63                     }   64                 }   65                 Console.WriteLine('Press <ENTER> to quit.');   66                 Console.ReadLine();   67             }   68             catch (Exception ex)   69             {   70                 Console.WriteLine(ex.Message);   71                 Console.ReadKey();   72             }   73             finally   74             {   75                 if (host.State == CommunicationState.Faulted)   76                     host.Abort();   77                 else   78                     host.Close();   79             }   80         }   81     }   82 }   83    84    

Hi, hope you can help….

I am creating a simple app(maybe webpage) that will have a simple UI and will upload files from an external device, the app/webpage will be started via autorun.inf when the user plugs a device into there PC. The webservice will perform the complex job of linking the file to the management system etc. This will enable the IT illiterate users that can’t use file explore to submit files to the the management system…!

The problem I have is that my RESTful serivce is giving me a 400 error when the content type is a image/jpeg.. It works fine for text/plain or text/xml (see Blog Post)

Thanks J

Answer 1

You can try to override any content-type and upload all files as application/octet-stream, or text/plain using an IOperationBehavior.

public class WebContentTypeAttribute : Attribute, IOperationBehavior, IDispatchMessageFormatter {     private IDispatchMessageFormatter innerFormatter;     public string ContentTypeOverride { get; set; }      public WebContentTypeAttribute(string contentTypeOverride)     {         this.ContentTypeOverride = contentTypeOverride;     }       // IOperationBehavior     public void Validate(OperationDescription operationDescription)     {      }      public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation)     {         innerFormatter = dispatchOperation.Formatter;         dispatchOperation.Formatter = this;     }      public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation)     {      }      public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters)     {      }      // IDispatchMessageFormatter     public void DeserializeRequest(Message message, object[] parameters)     {         if (message == null)             return;          if (string.IsNullOrEmpty(ContentTypeOverride))             return;          var httpRequest = (HttpRequestMessageProperty)message.Properties[HttpRequestMessageProperty.Name];         httpRequest.Headers['Content-Type'] = ContentTypeOverride;     }      public Message SerializeReply(MessageVersion messageVersion, object[] parameters, object result)     {         return innerFormatter.SerializeReply(messageVersion, parameters, result);     } } 

And you would have to modify your Service contract to look like this one

[OperationContract] [WebInvoke(Method = 'POST',UriTemplate = 'File/{fileName}')] [WebContentType('application/octet-stream')] bool UploadFile(string fileName, Stream fileContents);   

Although, if you are uploading from a webpage, wouldn’t the data be posted in a multipart/form-data format?