Returns an object query that, when it is executed, returns the same set of objects that exists in the current collection.
(in System.Data.Entity.dll)
'Usage
Dim instance As EntityCollection
Dim returnValue As ObjectQuery(Of TEntity)
returnValue = instance.CreateSourceQuery()
'Declaration
Public Function CreateSourceQuery As ObjectQuery(Of TEntity)
This property is used to obtain a new instance of ObjectQuery<(Of <(T>)>) that returns the same set of objects. This is useful as the starting point for a more complex join, union, or filtered query, or to return the same objects in a detached state by using the NoTracking option.
CreateSourceQuery is used to filter objects in an EntityCollection<(Of <(TEntity>)>) to enable you to bind only objects of a specific type. For more information, see Binding Objects to Controls (Entity Framework).
This example is based on a modified version of the School model. This version supports table-per-type inheritance with Course as an abstract type. Complete the Mapping Inheritance - Table-per-Type walkthrough to modify the School model to support the table-per-type inheritance example used in this topic.
This example shows how to use CreateSourceQuery to filter objects in an EntityCollection<(Of <(TEntity>)>) and bind only to objects of a specific type. For a complete version of this example, see How to: Bind Controls to Derived Types (Entity Framework).
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5 SP1
Reference