IDbCommandInterceptor.ScalarExecutedAsync 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
在 EF 呼叫 之後立即呼叫 ExecuteScalarAsync() 。
public System.Threading.Tasks.Task<object> ScalarExecutedAsync (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData eventData, object result, System.Threading.CancellationToken cancellationToken = default);
public System.Threading.Tasks.ValueTask<object> ScalarExecutedAsync (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData eventData, object result, System.Threading.CancellationToken cancellationToken = default);
public System.Threading.Tasks.ValueTask<object?> ScalarExecutedAsync (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData eventData, object? result, System.Threading.CancellationToken cancellationToken = default);
public virtual System.Threading.Tasks.ValueTask<object?> ScalarExecutedAsync (System.Data.Common.DbCommand command, Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData eventData, object? result, System.Threading.CancellationToken cancellationToken = default);
abstract member ScalarExecutedAsync : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData * obj * System.Threading.CancellationToken -> System.Threading.Tasks.Task<obj>
abstract member ScalarExecutedAsync : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData * obj * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<obj>
abstract member ScalarExecutedAsync : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData * obj * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<obj>
override this.ScalarExecutedAsync : System.Data.Common.DbCommand * Microsoft.EntityFrameworkCore.Diagnostics.CommandExecutedEventData * obj * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<obj>
Public Function ScalarExecutedAsync (command As DbCommand, eventData As CommandExecutedEventData, result As Object, Optional cancellationToken As CancellationToken = Nothing) As Task(Of Object)
Public Function ScalarExecutedAsync (command As DbCommand, eventData As CommandExecutedEventData, result As Object, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of Object)
Public Overridable Function ScalarExecutedAsync (command As DbCommand, eventData As CommandExecutedEventData, result As Object, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of Object)
參數
- command
- DbCommand
命令。
- eventData
- CommandExecutedEventData
命令和執行的相關內容資訊。
- result
- Object
呼叫 ExecuteScalarAsync() 的結果。 這個值通常用來作為這個方法實作的傳回值。
- cancellationToken
- CancellationToken
等候 CancellationToken 工作完成時要觀察的 。
傳回
, Task 提供 EF 將使用的結果。
任何未嘗試變更結果攔截器的這個方法實作是傳回 result
傳入的值,通常使用 FromResult<TResult>(TResult)
例外狀況
備註
如果在 中 ScalarExecutingAsync(DbCommand, CommandEventData, InterceptionResult<Object>, CancellationToken) 隱藏命令的執行攔截器,仍會呼叫這個方法。 在此情況下, result
是由 傳 ScalarExecutingAsync(DbCommand, CommandEventData, InterceptionResult<Object>, CancellationToken) 回的結果。