SpatialEdmFunctions.PointAt(DbExpression, DbExpression) Method
Definition
Important
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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
A new DbFunctionExpression that returns either the point at position indexValue
in spatialValue
or null
if spatialValue
is not a line string.
Exceptions
indexValue
spatialValue
indexValue
Applies to
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