ValueGenerator.NextValueAsync(EntityEntry, CancellationToken) 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。
要由實作覆寫的範本方法，以執行值產生。
protected virtual System.Threading.Tasks.Task<object> NextValueAsync (Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry entry, System.Threading.CancellationToken cancellationToken = default);protected virtual System.Threading.Tasks.ValueTask<object> NextValueAsync (Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry entry, System.Threading.CancellationToken cancellationToken = default);protected virtual System.Threading.Tasks.ValueTask<object?> NextValueAsync (Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry entry, System.Threading.CancellationToken cancellationToken = default);abstract member NextValueAsync : Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry * System.Threading.CancellationToken -> System.Threading.Tasks.Task<obj>
override this.NextValueAsync : Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry * System.Threading.CancellationToken -> System.Threading.Tasks.Task<obj>abstract member NextValueAsync : Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<obj>
override this.NextValueAsync : Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry * System.Threading.CancellationToken -> System.Threading.Tasks.ValueTask<obj>Protected Overridable Function NextValueAsync (entry As EntityEntry, Optional cancellationToken As CancellationToken = Nothing) As Task(Of Object)Protected Overridable Function NextValueAsync (entry As EntityEntry, Optional cancellationToken As CancellationToken = Nothing) As ValueTask(Of Object)參數
- entry
- EntityEntry
產生值之實體的變更追蹤專案。
- cancellationToken
- CancellationToken
等候 CancellationToken 工作完成時要觀察的 。
傳回
產生的值。
例外狀況
備註
如需詳細資訊和範例，請參閱 EF Core 價值產生 。
