共用方式為

ValueGenerator.NextValueAsync(EntityEntry, CancellationToken) 方法

  • 參考

定義

命名空間:
Microsoft.EntityFrameworkCore.ValueGeneration
組件:
Microsoft.EntityFrameworkCore.dll
套件:
Microsoft.EntityFrameworkCore v1.1.6
套件:
Microsoft.EntityFrameworkCore v2.0.3
套件:
Microsoft.EntityFrameworkCore v2.1.11
套件:
Microsoft.EntityFrameworkCore v2.2.6
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

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

Task<Object>
ValueTask<Object>

產生的值。

例外狀況

OperationCanceledException

如果取消 CancellationToken。

備註

如需詳細資訊和範例，請參閱 EF Core 價值產生 。

適用於