DbExpressionBuilder.Case Method

Reference

Definition

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

Assembly:: System.Data.Entity.dll

Important

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Creates a new DbCaseExpression.

public:
 static System::Data::Common::CommandTrees::DbCaseExpression ^ Case(System::Collections::Generic::IEnumerable<System::Data::Common::CommandTrees::DbExpression ^> ^ whenExpressions, System::Collections::Generic::IEnumerable<System::Data::Common::CommandTrees::DbExpression ^> ^ thenExpressions, System::Data::Common::CommandTrees::DbExpression ^ elseExpression);

public static System.Data.Common.CommandTrees.DbCaseExpression Case(System.Collections.Generic.IEnumerable<System.Data.Common.CommandTrees.DbExpression> whenExpressions, System.Collections.Generic.IEnumerable<System.Data.Common.CommandTrees.DbExpression> thenExpressions, System.Data.Common.CommandTrees.DbExpression elseExpression);

static member Case : seq<System.Data.Common.CommandTrees.DbExpression> * seq<System.Data.Common.CommandTrees.DbExpression> * System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbCaseExpression

Public Function Case (whenExpressions As IEnumerable(Of DbExpression), thenExpressions As IEnumerable(Of DbExpression), elseExpression As DbExpression) As DbCaseExpression

Parameters

whenExpressions: IEnumerable<DbExpression>

A list of expressions that provide the conditional for of each case.

thenExpressions: IEnumerable<DbExpression>

A list of expressions that provide the result of each case.

elseExpression: DbExpression

An expression that defines the result when no case is matched.

Returns

DbCaseExpression

A new DbCaseExpression with the specified cases and default result.

Exceptions

ArgumentNullException

whenExpressions or thenExpressions is null or contains null, or elseExpression is null.

ArgumentException

whenExpressions or thenExpressions is empty or whenExpressions contains an expression with a non-Boolean result type, or no common result type exists for all expressions in thenExpressions and elseExpression.

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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