SpatialEdmFunctions.PointAt(DbExpression, DbExpression) Method

Reference

Definition

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

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 DbFunctionExpression that invokes the canonical 'PointAt' function with the specified arguments. The first argument must have an Edm.Geography or Edm.Geometry result type. The second argument must have an integer numeric result type. The result type of the expression is the same as that of spatialValue.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbFunctionExpression ^ PointAt(System::Data::Common::CommandTrees::DbExpression ^ spatialValue, System::Data::Common::CommandTrees::DbExpression ^ indexValue);

public static System.Data.Common.CommandTrees.DbFunctionExpression PointAt (this System.Data.Common.CommandTrees.DbExpression spatialValue, System.Data.Common.CommandTrees.DbExpression indexValue);

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

<Extension()>
Public Function PointAt (spatialValue As DbExpression, indexValue As DbExpression) As DbFunctionExpression

Parameters

spatialValue: DbExpression

An expression that specifies the spatial line string value.

indexValue: DbExpression

An expression that specifies the position of the point to be retrieved from within the line string.

Returns

DbFunctionExpression

A new DbFunctionExpression that returns either the point at position indexValue in spatialValue or null if spatialValue is not a line string.

Exceptions

ArgumentNullException

indexValue

ArgumentException

spatialValue indexValue

Applies to

Κοινή χρήση μέσω