DbExpressionBuilder.OfType(DbExpression, TypeUsage) Method

Reference

Definition

Namespace:: System.Data.Common.CommandTrees.ExpressionBuilder

Assembly:: System.Data.Entity.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Creates a new DbOfTypeExpression that produces a set consisting of the elements of the given input set that are of the specified type.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbOfTypeExpression ^ OfType(System::Data::Common::CommandTrees::DbExpression ^ argument, System::Data::Metadata::Edm::TypeUsage ^ type);

public static System.Data.Common.CommandTrees.DbOfTypeExpression OfType (this System.Data.Common.CommandTrees.DbExpression argument, System.Data.Metadata.Edm.TypeUsage type);

static member OfType : System.Data.Common.CommandTrees.DbExpression * System.Data.Metadata.Edm.TypeUsage -> System.Data.Common.CommandTrees.DbOfTypeExpression

<Extension()>
Public Function OfType (argument As DbExpression, type As TypeUsage) As DbOfTypeExpression

Parameters

argument: DbExpression

A DbExpression that specifies the input set.

type: TypeUsage

Type metadata for the type that elements of the input set must have to be included in the resulting set.

Returns

DbOfTypeExpression

A new DbOfTypeExpression with the specified set argument and type, and an ExpressionKind of OfType.

Exceptions

ArgumentNullException

argument or type is null.

ArgumentException

argument does not have a collection result type, or type is not a type in the same type hierarchy as the element type of the collection result type of argument.

Remarks

DbOfTypeExpression requires that argument has a collection result type with a polymorphic element type, and that type is a type from the same type hierarchy as that element type.

Applies to

แชร์ผ่าน