c# - Entity Framework DbEntityEntry> '不包含 Where 的定义

Question

这个代码狙击手来自 Adding CreatedDate to an entity using Entity Framework 5 Code First

        public override int SaveChanges()
    {
        DateTime saveTime = DateTime.Now;
        foreach (var entry in this.ChangeTracker.Entries().Where(e => e.State == System.Data.EntityState.Added))
        {
            if (entry.Property("CreateDate").CurrentValue == null)
                entry.Property("CreateDate").CurrentValue = saveTime;
        }
        return base.SaveChanges();

    }

但在我的解决方案中，我收到此错误“System.Collection.Generic.IEnumerable '不包含 Where ...

Answer 1

我期待你失踪 using System.Linq