获取通过参数传递的对象的ID的问题

Question

我无法通过参数传递对象的ID。

编码：

private void SetEntityState(TEntity entity, EntityState entityStated)
{
    var entry = this.Context.Entry(entity);

    if (entry.State == EntityState.Detached)
    {
        // The problem is here.
        TEntity attachedEntity = this.DbSet.Where(
            x => x.Id.Equals(entity.Id)
            ).FirstOrDefault();

        if (attachedEntity != null)
        {
            var attachedEntry = this.Context.Entry(attachedEntity);

            attachedEntry.CurrentValues.SetValues(entity);

            attachedEntry.State = entityStated;
        }
        else
        {
            entry.State = entityStated;
        }
    }
}

问题在这里：

    TEntity attachedEntity = this.DbSet.Where(
        x => x.Id.Equals(entity.Id)
        ).FirstOrDefault();

“实体”的属性“ Id”始终返回0，但在调试中，我看到该值为3。

为什么会这样呢？

Answer 1

尝试这个

 TEntity attachedEntity = this.DbSet.Where(x => x.Id == entity.Id).FirstOrDefault();

要么

Int32 entityId = entity.Id;
TEntity attachedEntity = this.DbSet.Where(x => x.Id == entityId).FirstOrDefault();

Answer 2

也许您可以尝试（进行测试）：

var entry = Context.Find(entity); 

代替

var entry = this.Context.Entry(entity);