DbExpressionBuilder.IsEmpty(DbExpression) Method

Reference

Definition

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

Assembly:: System.Data.Entity.dll

Important

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Creates a new DbIsEmptyExpression that determines whether the specified set argument is an empty set.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbIsEmptyExpression ^ IsEmpty(System::Data::Common::CommandTrees::DbExpression ^ argument);

public static System.Data.Common.CommandTrees.DbIsEmptyExpression IsEmpty(this System.Data.Common.CommandTrees.DbExpression argument);

static member IsEmpty : System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbIsEmptyExpression

<Extension()>
Public Function IsEmpty (argument As DbExpression) As DbIsEmptyExpression

Parameters

argument: DbExpression

An expression that specifies the input set.

Returns

DbIsEmptyExpression

A new DbIsEmptyExpression with the specified argument.

Exceptions

ArgumentNullException

argument is null.

ArgumentException

argument does not have a collection result type.

Applies to

Продукт	Версии
.NET Framework	4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

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