并非所有由FormView使用的EntityDataSource加载的实体属性

我疯了。这是一个简单的场景:

实体定义(生成)

// this class is obviously generated by the designer, this is just an example
public class SomeEntity {
  public int SomeEntityID { get; set; } // primary key
  public String Property1 { get; set; }
  public String Property2 { get; set;
}

…在ASPX文件中

<asp:EntityDataSource 
ID="EntityDataSource1" runat="server"
ConnectionString="name=Connection" DefaultContainerName="SomeEntities"
EnableDelete="True" EnableInsert="True" EnableUpdate="True"
EntitySetName="SomeEntity" OnUpdating="UpdatingEntity" AutoGenerateWhereClause="true">
<WhereParameters>
  <asp:QueryStringParameter Name="SomeEntityID" QueryStringField="SomeEntityID" Type="Int32"/>
</WhereParameters>
</asp:EntityDataSource>
<asp:FormView runat="server" ID="FormView1" DataSourceID="EntityDataSource1">
   <EditItemTemplate>
    <asp:TextBox runat="server" ID="textbox1" Text='<%# Bind("Property1")%>'
   </EditItemTemplate>
</asp:FormView>

…在代码后面

// ... as per Diego Vega's unwrapping code
public TEntity GetItemObject<TEntity>(object dataItem)
    where TEntity : class
{
    var entity = dataItem as TEntity;
    if (entity != null)
    {
        return entity;
    }
    var td = dataItem as ICustomTypeDescriptor;
    if (td != null)
    {
        return (TEntity)td.GetPropertyOwner(null);
    }
    return null;
}
protected void UpdatingEntity(object sender, EntityDataSourceChangingEventArgs e) {
  SomeEntity entity = GetItemObject<SomeEntity>(e.Entity);
  // at this point entity.Property1 has the value of whatever was entered in the 
  // bound text box, but entity.Property2 is null (even when the field bound to this
  // property in the database contains a value
  // if I add another textbox to form view and bind Property2 to it ... then I can
  // obviously get its value from the entity object above 
 }

基本上,只有表单视图中绑定的属性在更新事件处理程序中才有它们的值可用,更糟的是,当我尝试从E.Context逐键重新加载实体时,我再次只获取那些属性。

给出了什么?如何在更新事件中访问实体的所有属性? 另外,如果数据源包含include,则这些包含的值在更新事件中不可用。发生什么事了,请帮忙!