使用WCF REST上传文件

Question

I am using following code :

    static void test()
        {
            string address = "http://localhost:4700/HostDevServer/HelloWorldService.svc";
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(address);
            req.Method = "POST";
            req.ContentType = "text/xml;charset=UTF-8";
            Stream reqStream = req.GetRequestStream();
            string fileContents = "the quick brown fox jumped over the lazy dog.";
            byte[] bodyContents = Encoding.UTF8.GetBytes(fileContents);
            reqStream.Write(bodyContents, 0, bodyContents.Length);
            reqStream.Close();

            HttpWebResponse resp;
            try
            {
                **resp = (HttpWebResponse)req.GetResponse();**
            }
            catch (WebException e)
            {
                resp = (HttpWebResponse)e.Response;
            }
            Console.WriteLine("HTTP/{0} {1} {2}", resp.ProtocolVersion, (int)resp.StatusCode, resp.StatusDescription); 
        }



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace MyWCFServices
{
    public class HelloWorldService : IHelloWorldService
    {
        public String GetMessage(String name)
        {
            return "Hello world from " + name + "!";
        }

        public bool UploadFile(Stream fileContent)
        {
            using (StreamReader fileContentReader = new StreamReader(fileContent))
            {
                string content = fileContentReader.ReadToEnd();
                File.WriteAllText(Path.Combine(@"c:\temp\aa.tmp"), content);
            }
            return false;
        }  
    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Web;
using System.IO;
using System.Web;

namespace MyWCFServices
{
    [ServiceContract]
    interface IHelloWorldService
    {
        [OperationContract]
        String GetMessage(String name);

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

        //[OperationContract]
        //[WebInvoke(UriTemplate = "UploadFile/{fileName}")]
        //void UploadFile(string fileName, Stream fileContent); 
    }
}

While uploading file, i get an error of Unsopported media type at the code highlighted in bold. Any idea ?

Answer 1

Although I can't directly see why it would affect this particular example - you shouldn't write the bytes of a file to a web request, because of the potential presence of byte values that are not expected or supported.

You should probably encode the bytes of the file as base 64 using

Convert.ToBase64String

Effectively uploading the file as a string.

At the other end you then treat the value as a string parameter on your service method, and use

Convert.FromBase64String

To get the bytes, and then you have the original file again. At my company we have web services that we use to take binary files such as docx and this is how we do it - it works a treat.