ObjectQuery<T>.OfType<TResultType> Method ()


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Limits the query to only results of a specific type.

Namespace:   System.Data.Objects
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public ObjectQuery<TResultType> OfType<TResultType>()

Return Value

Type: System.Data.Objects.ObjectQuery<TResultType>

A new ObjectQuery<T> instance that is equivalent to the original instance with OFTYPE applied.

Type Parameters


The type of the ObjectResult<T> returned when the query is executed with the applied filter.

Exception Condition

The type specified is not valid.

OfType<TResultType> is used to filter query results by a specific entity or complex type. This supports a conceptual model with object inheritance. For more information, see Entity Data Model Inheritance (Application Scenarios). The

OfType<TResultType> method can only be applied to an ObjectQuery<T> of an entity type or complex type that is defined in the EDM.

.NET Framework
Available since 3.5

ObjectQuery<T> Class
System.Data.Objects Namespace
How to: Create and Execute Object Queries using Table-per-Hierarchy Inheritance (Entity Framework)
How to: Query Objects with Table-per-Type Inheritance
Querying a Conceptual Model

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