SelectExpression.CreateColumnExpression Metoda

Definice

Obor názvů:

Microsoft.EntityFrameworkCore.Query.SqlExpressions

Sestavení:

Microsoft.EntityFrameworkCore.Relational.dll

Balíček:

Microsoft.EntityFrameworkCore.Relational v9.0.0

Zdroj:

SelectExpression.cs

Vytvoří odkaz ColumnExpression , který odkazuje na tabulku v tomto SelectExpressionobjektu .

public Microsoft.EntityFrameworkCore.Query.SqlExpressions.ColumnExpression CreateColumnExpression (Microsoft.EntityFrameworkCore.Query.SqlExpressions.TableExpressionBase tableExpression, string columnName, Type type, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping, bool? columnNullable = default);

member this.CreateColumnExpression : Microsoft.EntityFrameworkCore.Query.SqlExpressions.TableExpressionBase * string * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping * Nullable<bool> -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.ColumnExpression

Public Function CreateColumnExpression (tableExpression As TableExpressionBase, columnName As String, type As Type, typeMapping As RelationalTypeMapping, Optional columnNullable As Nullable(Of Boolean) = Nothing) As ColumnExpression

Parametry

tableExpression

TableExpressionBase

Výraz tabulky, na který sloupec odkazuje.

columnName

String

Název sloupce.

type

Type

Typ CLR sloupce.

typeMapping

RelationalTypeMapping

Mapování typů sloupce

columnNullable

Nullable<Boolean>

Určuje, jestli je sloupec s možnou hodnotou null.

Návraty

ColumnExpression