SpatialEdmFunctions.GeographyLineFromText(DbExpression, DbExpression) 方法

定義

命名空間:

System.Data.Common.CommandTrees.ExpressionBuilder.Spatial

組件:

System.Data.Entity.dll

建立一個使用指定引數叫用標準 'GeographyLineFromText' 函式的 DbFunctionExpression。 lineWellKnownText 必須具有字串結果型別，而 coordinateSystemId 必須具有整數數值結果型別。 運算式的結果型別為 Edm.Geography。

public:
 static System::Data::Common::CommandTrees::DbFunctionExpression ^ GeographyLineFromText(System::Data::Common::CommandTrees::DbExpression ^ lineWellKnownText, System::Data::Common::CommandTrees::DbExpression ^ coordinateSystemId);

public static System.Data.Common.CommandTrees.DbFunctionExpression GeographyLineFromText (System.Data.Common.CommandTrees.DbExpression lineWellKnownText, System.Data.Common.CommandTrees.DbExpression coordinateSystemId);

static member GeographyLineFromText : System.Data.Common.CommandTrees.DbExpression * System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbFunctionExpression

Public Function GeographyLineFromText (lineWellKnownText As DbExpression, coordinateSystemId As DbExpression) As DbFunctionExpression

參數

lineWellKnownText

DbExpression

提供地理線值之已知文字表示的運算式。

coordinateSystemId

DbExpression

運算式，提供地理線值座標系統的座標系統 ID (SRID)。

傳回

DbFunctionExpression

根據指定值傳回新地理線形值的新 DbFunctionExpression。

例外狀況

ArgumentNullException

lineWellKnownText coordinateSystemId

ArgumentException

lineWellKnownText coordinateSystemId