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PointAt Method
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SpatialEdmFunctions.PointAt Method

.NET Framework 4.6 and 4.5

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.

Namespace:  System.Data.Common.CommandTrees.ExpressionBuilder.Spatial
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public static DbFunctionExpression PointAt(
	this DbExpression spatialValue,
	DbExpression indexValue
)

Parameters

spatialValue
Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the spatial line string value.

indexValue
Type: System.Data.Common.CommandTrees.DbExpression

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

Return Value

Type: System.Data.Common.CommandTrees.DbFunctionExpression
A new DbFunctionExpression that returns either the point at position indexValue in spatialValue or null if spatialValue is not a line string.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type DbExpression. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
ArgumentNullException

spatialValue

ArgumentNullException

indexValue

ArgumentException

spatialValueindexValue

.NET Framework

Supported in: 4.6, 4.5
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