Question

I thought this would be incredibly simple, but I must be missing something. I am trying to make a simple WCF POST request in conjunction with a UriTemplate. I have read numerous examples where people use a stream paramater as the last paramater, and this is supposed to pick up the POST body. I can only get this to work if the stream is the only paramater.

I’ve gone back to basics with a simple Hello World service.

Here is my code on the client

static string Test()
{
    HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://localhost:1884/MyAPI/Service.svc/HelloWorld");
    req.Method = "POST";
    req.ContentType = "text/plain";
    Stream reqStream = req.GetRequestStream();
    byte[] fileToSend = System.Text.UTF8Encoding.UTF8.GetBytes("sometext");
    reqStream.Write(fileToSend, 0, fileToSend.Length);
    reqStream.Close();
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
    var sr = new StreamReader(resp.GetResponseStream());
    return sr.ReadToEnd();
}

And this is the code on the service

[ServiceContract]
public interface IService
{
    [OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "HelloWorld")]
    Stream HelloWorld(Stream content);
}

public Stream HelloWorld(Stream content)
{
    var sr = new StreamReader(content);
    string text = sr.ReadToEnd();
    return new System.IO.MemoryStream(Encoding.UTF8.GetBytes("Hello World! " + text)); 
}

This all works fine. Then I make this change:

[ServiceContract]
public interface IService
{
    [OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "HelloWorld/test/{test}")]
    Stream HelloWorld(string test, Stream content);
}

public Stream HelloWorld(string test, Stream content)
{
    var sr = new StreamReader(content);
    string text = sr.ReadToEnd();
    return new System.IO.MemoryStream(Encoding.UTF8.GetBytes("Hello World! " + text + test)); 
}

And change the client code to hit HelloWorld/test/sometext

I get a 500 Internal Server Error. I’ve tried about 10 different variations including using a ?key=value type UriTemplate, returning strings instead of streams etc, and no luck.

Feels like I’m missing some tiny little thing that is going to make this work, as I have seen countless examples of exactly this all over the web. Theirs works, mine doesn’t.

Any ideas?

Answer 1

I am not sure what went wrong, but after trying everything, I resolved this by creating a new project and copying all the code over. Never worked out what the differences were, maybe something got corrupted

Edit: in the end we discovered we had to specify WebServiceHostFactory in the Service.svc. This was there by default in the new project