EF 4.0 POCO magic不起作用-未检测到任何更改

我似乎无法从断开连接的poco对象更新数据库。在本例中,我获取一个ApplicationUser对象update varchar(100)field SSOID,但没有任何更改生效。即使我在save方法中重新提取对象,也不会向db发送任何内容。

在ObjectStateManager中找不到键与所提供对象的键匹配的对象。验证所提供对象的键值是否与必须应用更改的对象的键值匹配。

 public void Save(ApplicationUser au)
 {
     ApplicationUser original = context.ApplicationUsers.FirstorDefault(a => a.UserID == au.UserID);
     context.ContextOptions.ProxyCreationEnabled = false;  //changing this has no effect

     if(original == null)
     {
         context.AddObject("ApplicationUsers",au); //this works!
     }
     else
     {
          ///let's manually set some properties on the object I just fetched.
          original.SSOID = au.SSOID;
          ObjectStateEntry entry = null;
          context.DetectChanges();
          context.ObjectStateManager.TryGetObjectStateEntry(original.EntityKey, out entry);
          //entry is still null!
          context.ApplicationUsers.ApplyCurrentValues(original);  //BOOM!!
      }
      context.SaveChanges();
      return;
  }

我想尽一切办法,甚至 ApplicationUser 实施 System.Data.Objects.DataClasses.IEntityWithKey

这是地图:

<EntitySetMapping Name="ApplicationUsers">
    <EntityTypeMapping TypeName="MyCompanyName.ApplicationUser">
         <MappingFragment StoreEntitySet="ApplicationUser">
            <ScalarProperty Name="UserID" ColumnName="UserID" />
            <ScalarProperty Name="SystemID" ColumnName="SystemID" />
            <ScalarProperty Name="Username" ColumnName="Username" />
            <!--snip-->
            <ScalarProperty Name="CreatedOn" ColumnName="CreatedOn" />
            <ScalarProperty Name="CreatedBy" ColumnName="CreatedBy" />
            <ScalarProperty Name="SSOID" ColumnName="SSOID" />
         </MappingFragment>
     </EntityTypeMapping>
</EntitySetMapping>