For example, we have model class:
public abstract class Vehicle
{
[Key]
public int Model { get; set; }
[Key]
public string Name { get; set; }
public virtual int WheelCount { get; set; }
}
public class Motorcycle : Vehicle
{
public override int WheelCount { get { return 2; } }
public bool CanDoAWheelie { get; set; }
}
Build EDM model:
var motocycle = builder
.Entity<Motorcycle>();
motocycle.HasKey(v => v.Name)
.HasKey(v => v.Model)
.Property(v => v.WheelCount);
//.DerivesFrom<Vehicle>();
motocycle.Property(m => m.CanDoAWheelie);
motocycle.HasMany(m => m.Vehicles);
motocycle.HasMany(m => m.Motocycles);
motocycle.HasMany(m => m.SportBikes);
Define controller:
public class MotorcyclesController : ApiController
{
public void Post(Vehicle motocycle)
{
}
}
When posting back:
POST http://localhost:50232/Motorcycles HTTP/1.1
Host: localhost:50232
Content-Type: application/atom+xml
Content-Length: 796
<entry xml:base="http://localhost:50232/" xmlns="http://www.w3.org/2005/Atom" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns:georss="http://www.georss.org/georss" xmlns:gml="http://www.opengis.net/gml">
<category term="ODataRepro.Motorcycle" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />
<id />
<title />
<updated>2012-09-24T20:28:44Z</updated>
<author>
<name />
</author>
<content type="application/xml">
<m:properties>
<d:Name>Test</d:Name>
<d:Model m:type="Edm.Int32">0</d:Model>
<d:CanDoAWheelie m:type="Edm.Boolean">false</d:CanDoAWheelie>
</m:properties>
</content>
</entry>
It reports error:
Microsoft.Data.OData.ODataException occurred
HResult=-2146233079
Message=An entry with type 'ODataRepro.Motorcycle' was found, but it is not assignable to the expected type 'ODataRepro.Vehicle'. The type specified in the entry must be equal to either the expected type or a derived type.
Source=Microsoft.Data.OData
StackTrace:
at Microsoft.Data.OData.ValidationUtils.ValidateEntityTypeIsAssignable(IEdmEntityTypeReference expectedEntityTypeReference, IEdmEntityTypeReference payloadEntityTypeReference)
InnerException:
Comments: You need to add the Vehicle to the model explicitly. In the conventional model builder, we can add the base class automatically.