Question

我有一个从数据库中提取的EF对象。然后，我通过使用另一个DBContext的函数调用更新DB中的相应行。在此更新之后，我想用更新的内容重新加载对象的内容，但是EF上下文似乎缓存了内容。这是代码的一个示例（我已经删除了一些不相关的绒毛以使其更简单）：

using (UmbrellaEntities context = new UmbrellaEntities())
{
    var umbrella = (from u in context.Umbrellas
                    where u.umbrellaId == umbrellaId
                    && !u.deleted
                    select u).Single();
    int oldVersion = umbrella.Version; 

    updateUmbrellaVersions(); //perform update on table Umbrella using a new `UmbrellaEntities` object.
    //ideally I'd like to be able to get the updated umbrella.Version without a new call.

    var umbrella = (from u in context.Umbrellas
                    where u.umbrellaId == umbrellaId
                    && !u.deleted
                    select u).Single(); 
     int newVersion = umbrella.Version; //at this point i expect newVersion to be different from oldVersion, since the value in the db has been updated, but that's not the case.
}

我发现我可以使用新的上下文来提取更新的上下文，但效率很低。

using (UmbrellaEntities context = new UmbrellaEntities())
{
        var umbrella = (from u in context.Umbrellas
                        where u.umbrellaId == umbrellaId
                        && !u.deleted
                        select u).Single();
        int oldVersion = umbrella.Version; 
        updateUmbrellaVersions(); //perform update on table Umbrella using a new `UmbrellaEntities` object.
}

using (UmbrellaEntities context = new UmbrellaEntities())
{
        var umbrella = (from u in context.Umbrellas
                        where u.umbrellaId == umbrellaId
                        && !u.deleted
                        select u).Single();
        int newVersion = umbrella.Version; //we have the right value
}

有没有办法在执行更新后直接重新加载内容？

Answer 1

您应该可以致电context.Refresh(RefreshMode.StoreWins,umbrella)以确保您拥有最新版本。

使用更新的值在实体框架上下文中重新加载对象

1 个答案: