R – How to implement IDataServiceMetadataProvider and tell the Data Service to use that custom provider

.net-4.0-beta-2astoriavisual studio 2010wcf-data-services

There's no obvious entry point for implementing a custom provider for an ADO.NET Data Service using IDataServiceMetadataProvider, and then telling a Data Service to use that provider. Has anyone had any luck in this area? I've tried implementing this interface on my Data Source class, but none of my breakpoints are hit. There is also no (obvious) way to set the provider from the Data Service's DataServiceConfiguration parameter passed in to the InitializeService function.

Any help would be appreciated. Thanks!

Data Services Providers (ADO.NET Data Services)

IDataServiceMetadataProvider Members

Best Answer

We are looking at revising some of the documentation for these interfaces for RTM. In the meantime , to get the Data Services runtime to pick up your IDataServiceMetadataProvider implementation , you will need to implement the IServiceProvider interface on your Data Service class .

IServiceProvider on MSDN

Sample :

public class northwindService:DataService<northwindContext> , IServiceProvider 
{
   public object GetService(Type serviceType) 
   {
      if (serviceType == typeof(IDataServiceMetadataProvider )) {
        //return instance of type which implements IDataServiceMetadataProvider 
       }
     return null;
    }  
}

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[ServiceOperation]
public string SayHello(int[] input)
{
    StringBuilder strings = new StringBuilder();

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    {
        strings.AppendFormat("Hello {0}!", i);
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    return strings.ToString();
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Not sure on the ADO.Net Data Service. Might be an issue because of the RESTful interface.

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Then I found that the custom provider toolkit makes this task quite easy. Have a look at the solution and the way the demo web service therein is implemented. Then alter that demo project to fit your needs. It's much easier that coding all this from scratch, and the toolkit is built with reusability in mind anyway.

Best Answer

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