SqlNullabilityProcessor.VisitDistinct 方法

定義

命名空間:

Microsoft.EntityFrameworkCore.Query

組件:

Microsoft.EntityFrameworkCore.Relational.dll

套件:

Microsoft.EntityFrameworkCore.Relational v9.0.0

來源:

SqlNullabilityProcessor.cs

DistinctExpression造訪 並計算其可為 Null 性。

protected virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression VisitDistinct (Microsoft.EntityFrameworkCore.Query.SqlExpressions.DistinctExpression distinctExpression, bool allowOptimizedExpansion, out bool nullable);

abstract member VisitDistinct : Microsoft.EntityFrameworkCore.Query.SqlExpressions.DistinctExpression * bool * bool -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.VisitDistinct : Microsoft.EntityFrameworkCore.Query.SqlExpressions.DistinctExpression * bool * bool -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression

Protected Overridable Function VisitDistinct (distinctExpression As DistinctExpression, allowOptimizedExpansion As Boolean, ByRef nullable As Boolean) As SqlExpression

參數

distinctExpression

DistinctExpression

要造訪的定序運算式。

allowOptimizedExpansion

Boolean

布林值，指出是否允許將 Null 值視為 false 值的優化擴充。

nullable

Boolean

bool 值，指出 sql 運算式是否可為 Null。

傳回

SqlExpression

優化的 sql 運算式。