ValueGenerator.NextValueAsync(EntityEntry, CancellationToken) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
要由实现重写的模板方法来执行值生成。
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)参数
- entry
- EntityEntry
要为其生成值的实体的更改跟踪条目。
- cancellationToken
- CancellationToken
等待任务完成时观察的 A CancellationToken 。
返回
生成的值。
例外
如果取消了该操作 CancellationToken 。
注解
有关详细信息和示例，请参阅 EF Core 值生成 。
