共用方式為

QueryableMethodTranslatingExpressionVisitor.TranslateElementAtOrDefault 方法

  • 參考

定義

命名空間:
Microsoft.EntityFrameworkCore.Query
組件:
Microsoft.EntityFrameworkCore.dll
套件:
Microsoft.EntityFrameworkCore v3.0.0
套件:
Microsoft.EntityFrameworkCore v3.1.0
套件:
Microsoft.EntityFrameworkCore v5.0.0
套件:
Microsoft.EntityFrameworkCore v6.0.0
套件:
Microsoft.EntityFrameworkCore v7.0.0
套件:
Microsoft.EntityFrameworkCore v8.0.0

轉譯 ElementAt<TSource>(IQueryable<TSource>, Int32) 方法或 ElementAtOrDefault<TSource>(IQueryable<TSource>, Int32) 透過指定的來源。

protected abstract Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression TranslateElementAtOrDefault (Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression source, System.Linq.Expressions.Expression index, bool returnDefault);
protected abstract Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression? TranslateElementAtOrDefault (Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression source, System.Linq.Expressions.Expression index, bool returnDefault);
abstract member TranslateElementAtOrDefault : Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression * System.Linq.Expressions.Expression * bool -> Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression
Protected MustOverride Function TranslateElementAtOrDefault (source As ShapedQueryExpression, index As Expression, returnDefault As Boolean) As ShapedQueryExpression

參數

source
ShapedQueryExpression

套用運算子的成形查詢。

index
Expression

項目的索引。

returnDefault
Boolean

值，指出是否應該傳回或擲回預設值。

傳回

ShapedQueryExpression

翻譯後的成形查詢。

適用於