SqlSpatialServices.GeographyPolygonFromText 方法
[此頁面專屬於 Entity Framework 第 6 版。最新版本可從 'Entity Framework' NuGet 套件取得。如需 Entity Framework 的詳細資訊，請參閱 msdn.com/data/ef。]
根據指定的已知文字值和座標系統識別項 (SRID)，建立新的 DbGeography 多邊形值。
命名空間： System.Data.Entity.SqlServer
組件： EntityFramework.SqlServer (在 EntityFramework.SqlServer.dll 中)
語法
'宣告
Public Overrides Function GeographyPolygonFromText ( _
polygonWellKnownText As String, _
coordinateSystemId As Integer _
) As DbGeography
'用途
Dim instance As SqlSpatialServices
Dim polygonWellKnownText As String
Dim coordinateSystemId As Integer
Dim returnValue As DbGeography
returnValue = instance.GeographyPolygonFromText(polygonWellKnownText, _
coordinateSystemId)
public override DbGeography GeographyPolygonFromText(
string polygonWellKnownText,
int coordinateSystemId
)
public:
virtual DbGeography^ GeographyPolygonFromText(
String^ polygonWellKnownText,
int coordinateSystemId
) override
abstract GeographyPolygonFromText :
polygonWellKnownText:string *
coordinateSystemId:int -> DbGeography
override GeographyPolygonFromText :
polygonWellKnownText:string *
coordinateSystemId:int -> DbGeography
public override function GeographyPolygonFromText(
polygonWellKnownText : String,
coordinateSystemId : int
) : DbGeography
參數
- polygonWellKnownText
類型：System.String
包含地理位置值之已知文字表示法的字串。
- coordinateSystemId
類型：System.Int32
新的 DbGeography 值應該使用的座標系統的識別項。
傳回值
類型：System.Data.Entity.Spatial.DbGeography
新的 DbGeography 值，由具有指定的座標系統識別項 (SRID) (DefaultCoordinateSystemId) 的已知文字值所定義。