C# OData4 Apply OData query without controller returning Queryable

Question

I currently have an C# WebAPI that uses a version of OData that we wrote. We want to start using Microsoft's OData4 which can do more then our custom implementation.

Creating a controller that extends the ODataController I can create a controller that automatically queries based on the query string. (Shown below)

The problem is that it returns the results of the query when I want it to return the Result object which includes additional data. When I set the return type to Result though it will no longer apply the query string.

How can I use the automatic queryable implementation and still return my own object? I've tried making a public method that returns the correct object and calls a private method returning the queryable but it doesn't filter the queryable correctly.

Am I on the right track, or are there other options?

public class CallController : ODataController
{
    [EnableQuery]
    public IQueryable<Call> GetCall()
    {
        var list = new List<Call>
        {
            new Call
            {
                Id = 4
            },
            new Call
            {
                Id = 9
            },
            new Call
            {
                Id = 1
            }
        };
        return list.AsQueryable();
    }
}

public class Call
{
    public int Id { get; set; }
}

public class Result
{
     public Call[] Calls { get; set; }
     public string NewToken { get; set; }
     public string Warning { get; set; }
}

ATerry ATerry · Accepted Answer · 2017-01-06T23:33:06

You would need to intercept the response with an action filter attribute in the onactionexecuted and convert the value to whatever you want. It wouldn't be pretty since it wouldn't be clear what the method was truly returning. But I don't see any other option with odata as the result must be iquerable.

C# OData4 Apply OData query without controller returning Queryable

3 Answers