EdmFunctions.Left(DbExpression, DbExpression) Method

Reference

Definition

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

Assembly:: System.Data.Entity.dll

Important

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Creates a DbFunctionExpression that invokes the canonical 'Left' function with the specified arguments, which must have a string and integer numeric result type. The result type of the expression is string.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbFunctionExpression ^ Left(System::Data::Common::CommandTrees::DbExpression ^ stringArgument, System::Data::Common::CommandTrees::DbExpression ^ length);

public static System.Data.Common.CommandTrees.DbFunctionExpression Left(this System.Data.Common.CommandTrees.DbExpression stringArgument, System.Data.Common.CommandTrees.DbExpression length);

static member Left : System.Data.Common.CommandTrees.DbExpression * System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbFunctionExpression

<Extension()>
Public Function Left (stringArgument As DbExpression, length As DbExpression) As DbFunctionExpression

Parameters

stringArgument: DbExpression

An expression that specifies the string from which to extract the leftmost substring.

length: DbExpression

An expression that specifies the length of the leftmost substring to extract from stringArgument.

Returns

DbFunctionExpression

A new DbFunctionExpression that returns the leftmost substring of length length from stringArgument.

Exceptions

ArgumentNullException

stringArgument or length is null.

ArgumentException

stringArgument is invalid.

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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