如何用实体框架保存和加载System.IO.Stream对象

我想使用Telerik的PersistenceFramework保存wpf应用程序的"view"状态。

我可以保存和加载流的动态，就像在文档的例子，但我需要在数据库中存储status流对象。

我目前正在尝试这些函数:

public static void SaveGridStatus(System.IO.Stream stream)
{
    using (MyEntities context = new MyEntities())
    {
        MemoryStream ms = new MemoryStream();
        stream.CopyTo(ms);
        TestViewStatus t = new TestViewStatus { GridStatus = ms.ToArray() };
        context.TestViewStatuses.Add(t);
        context.SaveChanges();
    }
}
public static Stream LoadGridStatus()
{
    using (MyEntities context = new MyEntities())
    {
        TestViewStatus t = (from d in context.TestViewStatuses
                select d).FirstOrDefault();
        return t.GridStatus;
    }
}

TestViewStatus的地方。GridStatus是一个VARBINARY(MAX)

数据库中保存了一些东西，但是当我尝试使用持久性框架在控件中加载它时，什么也没有发生

编辑:

按请求将流加载到控制中的代码

private void SaveGridLayout_Click(object sender, System.Windows.RoutedEventArgs e)
{
    PersistenceManager manager = new PersistenceManager();
    this.stream = manager.Save(this.BrowseProjectGrid);
    SaveBrowseGridStatus(this.stream);
    this.EnsureLoadState();
}
private void LoadGridLayout_Click(object sender, System.Windows.RoutedEventArgs e)
{
    this.stream.Position = 0L;
    PersistenceManager manager = new PersistenceManager();
    manager.Load(this.BrowseProjectGrid, LoadBrowseGridStatus());
    this.EnsureLoadState();
}

(我想指出，它的工作正确，如果我使用本地Stream对象来保存和检索视图状态)

public static Stream LoadGridStatus()
{
    using (MyEntities context = new MyEntities())
    {
        TestViewStatus t = (from d in context.TestViewStatuses
                select d).FirstOrDefault();
        return t.GridStatus;
    }
}

public static Stream LoadGridStatus()
{
    using (MyEntities context = new MyEntities())
    {
        TestViewStatus t = (from d in context.TestViewStatuses
                select d).FirstOrDefault();
        return new MemoryStream(t.GridStatus);
    }
}