PUT/POST Key/Value collection to OpenRasta - openrasta

Question

How should an OpenRasta handler be implemented such that it can accept a URL-template based ID together with a dictionary, Hashtable or NameValueCollection (I don't care which one)?
My URL-template is "/fielddata/{correlationId}".
My PUT message is:
PUT http://myhost/fielddata/39950 HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 14
X=123&Y=Abc
I have tried a handler like this:
public class FieldDataHandler
{
public void Put(string correlationId, NameValueCollection data)
{
}
}
But get an exception like this:
openrasta Verbose: 0 : Incoming host request for http://myhost/fielddata/39950
openrasta Verbose: 0 : Adding communication context data
openrasta Verbose: 0 : Found 1 operation(s) with a matching name.
openrasta Verbose: 0 : Found 0 operation(s) with matching [HttpOperation] attribute.
openrasta Information: 0 : Operation FieldDataHandler::Put(String correlationId, NameValueCollection data) selected with 2 required members and 0 optional members, with codec ApplicationXWwwFormUrlencodedKeyedValuesCodec with score 1,333333.
openrasta Error: 0 : An error has occurred and the processing of the request has stopped.
Exception:
System.InvalidOperationException: The operation is not ready for invocation.
at OpenRasta.OperationModel.MethodBased.MethodBasedOperation.Invoke() in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\OperationModel\MethodBased\MethodBasedOperation.cs:line 56
at OpenRasta.OperationModel.Interceptors.OperationWithInterceptors.<Invoke>b__0() in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\OperationModel\Interceptors\OperationWithInterceptors.cs:line 47
at OpenRasta.OperationModel.Interceptors.OperationWithInterceptors.Invoke() in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\OperationModel\Interceptors\OperationWithInterceptors.cs:line 52
at OpenRasta.OperationModel.OperationExecutor.Execute(IEnumerable`1 operations) in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\OperationModel\OperationExecutor.cs:line 14
at OpenRasta.Pipeline.Contributors.OperationInvokerContributor.ExecuteOperations(ICommunicationContext context) in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\Pipeline\Contributors\OperationInvokerContributor.cs:line 29
at OpenRasta.Pipeline.PipelineRunner.ExecuteContributor(ICommunicationContext context, ContributorCall call) in c:\Projects\OpenRasta\openrasta-stable\src\core\OpenRasta\Pipeline\PipelineRunner.cs:line 187
openrasta Information: 0 : Executing OperationResult OperationResult: type=InternalServerError, statusCode=500.

Answer 1

Ended up fixing this by creating a new Codec for a domain specific resource type (instead of the generic NameValueCollection type) and then do the form-urlencoded (de)serialization by other means.
The codec itself looks like this:
[MediaType("application/x-www-form-urlencoded")]
public class RestFieldDataCodec : IMediaTypeWriter, IMediaTypeReader
{
public void WriteTo(object entity, IHttpEntity response, string[] codecParameters)
{
RestFieldData data = (RestFieldData)entity;
using (TextWriter writer = new StreamWriter(response.Stream))
{
FormUrlEncodingSerializer serializer = new FormUrlEncodingSerializer(typeof(NameValueCollection));
serializer.Serialize(writer, data.Data);
}
}
public object ReadFrom(IHttpEntity request, IType destinationType, string destinationName)
{
using (TextReader reader = new StreamReader(request.Stream))
{
FormUrlEncodingSerializer serializer = new FormUrlEncodingSerializer(typeof(NameValueCollection));
NameValueCollection keyValueData = (NameValueCollection)serializer.Deserialize(reader);
return new RestFieldData
{
Data = keyValueData
};
}
}
public object Configuration { get; set; }
}
And the resource type is rather simple:
public class RestFieldData
{
public NameValueCollection Data { get; set; }
}
The FormUrlEncodingSerializer class is from https://github.com/JornWildt/Ramone
The handler method ended up like this:
public void Put(string correlationId, RestFieldData payload)
{
...
}