OData SingleResult is Ambiguous in System.Web.Http

Question

I am new to using OData with a Web Api. I have my models defined from a database first EF 6 method, and have added the OData controller. The resulting code is erroring out on the following:

< EnableQuery > _

    Public Function [Get](<FromODataUri> key As Integer) As SingleResult(Of Product)
        Dim result As IQueryable(Of Product) = db.Product.Where(Function(p) p.ID= key)
        Return SingleResult.Create(result)
    End Function

The error is on the SingleResult providing the following error: SingleResult is ambiguous in system.web.http.

Any advice on what causes this error? Many thanks!

Answer 1

Make sure you don't have multiple OData NuGets installed. I had 2.1 and 2.2 (for OData v4 support) installed, which gave me the exact same issue.

Answer 2

Try this:

Return SingleResult(of Product).Create(result)