通过

RelationalSqlTranslatingExpressionVisitor.TranslateCount 方法

  • 参考

定义

命名空间:
Microsoft.EntityFrameworkCore.Query
程序集:
Microsoft.EntityFrameworkCore.Relational.dll
包:
Microsoft.EntityFrameworkCore.Relational v3.0.0
包:
Microsoft.EntityFrameworkCore.Relational v3.1.0
包:
Microsoft.EntityFrameworkCore.Relational v5.0.0
包:
Microsoft.EntityFrameworkCore.Relational v6.0.0
包:
Microsoft.EntityFrameworkCore.Relational v7.0.0
包:
Microsoft.EntityFrameworkCore.Relational v8.0.0

重载

TranslateCount(Expression)
TranslateCount(SqlExpression)
已过时.

将表达式的 Count 转换为等效的 SQL 表示形式。

TranslateCount(Expression) 

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression TranslateCount (System.Linq.Expressions.Expression expression = default);
abstract member TranslateCount : System.Linq.Expressions.Expression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.TranslateCount : System.Linq.Expressions.Expression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
Public Overridable Function TranslateCount (Optional expression As Expression = Nothing) As SqlExpression

参数

expression
Expression

返回

SqlExpression

适用于

TranslateCount(SqlExpression)

注意

Use IAggregateMethodCallTranslatorProvider to add translation for aggregate methods

将表达式的 Count 转换为等效的 SQL 表示形式。

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression TranslateCount (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression sqlExpression);
public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression? TranslateCount (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression sqlExpression);
[System.Obsolete("Use IAggregateMethodCallTranslatorProvider to add translation for aggregate methods")]
public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression? TranslateCount (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression sqlExpression);
abstract member TranslateCount : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.TranslateCount : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
[<System.Obsolete("Use IAggregateMethodCallTranslatorProvider to add translation for aggregate methods")>]
abstract member TranslateCount : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.TranslateCount : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
Public Overridable Function TranslateCount (sqlExpression As SqlExpression) As SqlExpression

参数

sqlExpression
SqlExpression

要转换 Count over 的表达式。

返回

SqlExpression

对给定表达式的 Count 的 SQL 转换。

属性
ObsoleteAttribute

适用于