DbSpatialServices.GetStartPoint 方法

定义

返回表示给定 DbGeography 值起点的 DbGeography 值。Returns a DbGeography value that represents the start point of the given DbGeography value.

重载

GetStartPoint(DbGeography)

返回表示给定 DbGeography 值起点的 DbGeography 值,如果该值不表示曲线则可能为 null。Returns a DbGeography value that represents the start point of the given DbGeography value, which may be null if the value does not represent a curve.

GetStartPoint(DbGeometry)

返回表示给定 DbGeometry 值起点的 DbGeometry 值,如果该值不表示曲线则可能为 null。Returns a DbGeometry value that represents the start point of the given DbGeometry value, which may be null if the value does not represent a curve.

GetStartPoint(DbGeography)

返回表示给定 DbGeography 值起点的 DbGeography 值,如果该值不表示曲线则可能为 null。Returns a DbGeography value that represents the start point of the given DbGeography value, which may be null if the value does not represent a curve.

public:
 abstract System::Data::Spatial::DbGeography ^ GetStartPoint(System::Data::Spatial::DbGeography ^ geographyValue);
public abstract System.Data.Spatial.DbGeography GetStartPoint (System.Data.Spatial.DbGeography geographyValue);
abstract member GetStartPoint : System.Data.Spatial.DbGeography -> System.Data.Spatial.DbGeography
Public MustOverride Function GetStartPoint (geographyValue As DbGeography) As DbGeography

参数

geographyValue
DbGeography

不需要表示曲线的地理值。The geography value, which need not represent a curve.

返回

DbGeography

给定的 DbGeography 值的启动点。The start point of the given DbGeography value.

例外

geographyValue

geographyValue

适用于

GetStartPoint(DbGeometry)

返回表示给定 DbGeometry 值起点的 DbGeometry 值,如果该值不表示曲线则可能为 null。Returns a DbGeometry value that represents the start point of the given DbGeometry value, which may be null if the value does not represent a curve.

public:
 abstract System::Data::Spatial::DbGeometry ^ GetStartPoint(System::Data::Spatial::DbGeometry ^ geometryValue);
public abstract System.Data.Spatial.DbGeometry GetStartPoint (System.Data.Spatial.DbGeometry geometryValue);
abstract member GetStartPoint : System.Data.Spatial.DbGeometry -> System.Data.Spatial.DbGeometry
Public MustOverride Function GetStartPoint (geometryValue As DbGeometry) As DbGeometry

参数

geometryValue
DbGeometry

不需要表示曲线的几何图形值。The geometry value, which need not represent a curve.

返回

DbGeometry

给定的 DbGeometry 值的启动点。The start point of the given DbGeometry value.

例外

geometryValue

geometryValue

适用于