Visual Basic 2015 Unleashed

Implementing CRUD Operations

The next step is to implement CRUD operations. For queries, methods in the OData service must match HTTP verbs. Adding a new object through an OData service is done via the POST verb. So you need to replace the PostCustomer method with the following:

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<ResponseType(GetType(Customer))>Async Function Post(ByVal customer As Customer) _      As Task(Of IHttpActionResult)    If Not ModelState.IsValid Then        Return BadRequest(ModelState)    End If    db.Customers.Add(customer)    Try        Await db.SaveChangesAsync()    Catch ex As DbUpdateException        If (CustomerExists(customer.CustomerID)) Then            Return Conflict()        Else            Throw        End If    End Try    Return ...