IDbCommandInterceptor.ScalarExecuting 方法

定义

在 EF 打算调用 之前调用 ExecuteScalar()

public Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<object> ScalarExecuting (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandEventData eventData, Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<object> result);
public virtual Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<object> ScalarExecuting (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandEventData eventData, Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<object> result);
abstract member ScalarExecuting : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandEventData * Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj> -> Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj>
abstract member ScalarExecuting : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandEventData * Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj> -> Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj>
override this.ScalarExecuting : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandEventData * Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj> -> Microsoft.EntityFrameworkCore.Diagnostics.InterceptionResult<obj>
Public Function ScalarExecuting (command As DbCommand, eventData As CommandEventData, result As InterceptionResult(Of Object)) As InterceptionResult(Of Object)
Public Overridable Function ScalarExecuting (command As DbCommand, eventData As CommandEventData, result As InterceptionResult(Of Object)) As InterceptionResult(Of Object)

参数

command
DbCommand

命令。

eventData
CommandEventData

有关命令和执行的上下文信息。

result
InterceptionResult<Object>

表示当前结果(如果存在)。 如果某个以前的侦听器通过调用 SuppressWithResult(TResult)来禁止执行,则此值将HasResult设置为 true 。 此值通常用作此方法实现的返回值。

返回

如果 HasResult 为 false,EF 将照常继续。 如果 HasResult 为 true,则 EF 将取消它要执行的操作并改为使用 Result 。 对于未尝试更改结果的任何侦听器,此方法的实现是返回 result 传入的值。

适用于