M 屬性
Returns the M (measure) value of the geography instance.
命名空間： Microsoft.SqlServer.Types
組件： Microsoft.SqlServer.Types (在 Microsoft.SqlServer.Types.dll 中)
語法
'宣告
Public ReadOnly Property M As SqlDouble
Get
'用途
Dim instance As SqlGeography
Dim value As SqlDouble
value = instance.M
public SqlDouble M { get; }
public:
property SqlDouble M {
SqlDouble get ();
}
member M : SqlDouble
function get M () : SqlDouble
屬性值
型別：System.Data.SqlTypes. . :: . .SqlDouble
A SqlDouble value that specifies the measure value.
備註
The semantics of the measure value are user-defined but generally describe the distance along a linestring. For example, the measure value could be used to keep track of mileposts along a road.
The value of this property is null if the geography instance is not a Point, as well as for any Point instance for which it is not set.
This property is read-only.
M values are not used in any calculations made by the library and will not be carried through any library calculations.