EF CORE 没有时间戳的乐观并发

Question

我正在处理大量实体，每个实体都有多个属性。每个属性都参与保存时的乐观并发检查。我更喜欢避免使用时间戳，因为我应该在每个表上添加字段，我正在使用遗留数据库并且我不想对其进行任何更改。采用的解决方案依赖调用modelBuilder中的IsConcurrencyToken

 protected override void OnModelCreating(ModelBuilder modelBuilder)
            {
                modelBuilder.Entity<MyEntity1>(entity =>
                {
                    entity.Property(e => e.Property1).IsConcurrencyToken;
                    entity.Property(e => e.Property2).IsConcurrencyToken;
                    entity.Property(e => e.Property3).IsConcurrencyToken;


                    entity.Property(e => e.PropertyN).IsConcurrencyToken;
                });         
             }

但我真的需要为每个属性显式调用 IsConcurrencyToken 吗？是否有机会配置我的实体以自动将每个属性包含在并发检查中？

Answer 1

Is there any chance to configure my entities to automatically include every properties in the concurrency check?

是的。您可以在 OnModelCreating 中迭代所有实体和属性：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    foreach (var entity in modelBuilder.Model.GetEntityTypes())
    {
        foreach (var prop in entity.GetProperties())
        {
            prop.IsConcurrencyToken = true;
        }
    }

    base.OnModelCreating(modelBuilder);
}

Answer 2

感谢 David Browne 的建议。

因为我希望能够按实体启用并发实体，所以我将代码包装在扩展方法中

  public static EntityTypeBuilder<TEntity> EnableConcurrency<TEntity>(this EntityTypeBuilder<TEntity> entityTypeBuilder) where TEntity : class
        {
            var entity = entityTypeBuilder.Metadata.Model.FindEntityType(typeof(TEntity));
            foreach (var prop in entity.GetProperties())
            {
                prop.IsConcurrencyToken = true;
            }
            return entityTypeBuilder;
        }

我打算那样使用它

modelBuilder.Entity<MyEntity>(entity =>
            {
                entity.EnableConcurrency();
            });

EF CORE 没有时间戳的乐观并发

EF CORE Optimistic concurrency without timestamp

c#

.net

entity-framework

ef-core-2.1