Bewerken

Delen via


DbExpressionBuilder.OfTypeOnly(DbExpression, TypeUsage) Method

Definition

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

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbOfTypeExpression ^ OfTypeOnly(System::Data::Common::CommandTrees::DbExpression ^ argument, System::Data::Metadata::Edm::TypeUsage ^ type);
public static System.Data.Common.CommandTrees.DbOfTypeExpression OfTypeOnly (this System.Data.Common.CommandTrees.DbExpression argument, System.Data.Metadata.Edm.TypeUsage type);
static member OfTypeOnly : System.Data.Common.CommandTrees.DbExpression * System.Data.Metadata.Edm.TypeUsage -> System.Data.Common.CommandTrees.DbOfTypeExpression
<Extension()>
Public Function OfTypeOnly (argument As DbExpression, type As TypeUsage) As DbOfTypeExpression

Parameters

argument
DbExpression

An DbExpression that specifies the input set.

type
TypeUsage

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

Returns

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

Exceptions

argument or type is null.

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