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CollectionViewSource 这是我的第一个WPF 应用程序,我需要一些帮助

ObjectQuery<ITPORTAL.HRMS_IT_ASSET_MASTER> ass = gRACHRMSEntities.HRMS_IT_ASSET_MASTER;

并且分配给 CollectionViewSource.Source 的对象查询如下

hRMS_IT_ASSET_MASTERQuery = Load_Asset_Master_Data(gRACHRMSEntities.HRMS_IT_ASSET_MASTER);
hRMS_IT_ASSET_MASTERViewSource.Source = hRMS_IT_ASSET_MASTERQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);

但是这段代码不支持过滤设施,这就是为什么我要添加这样的东西

 private ObservableCollection<ITPORTAL.HRMS_IT_ASSET_MASTER> Load_Asset_Master_Data(System.Data.Objects.ObjectQuery<ITPORTAL.HRMS_IT_ASSET_MASTER> objectSet)
        {
            ObservableCollection<ITPORTAL.HRMS_IT_ASSET_MASTER> oc = null;
            try
            {
                var value = from Asset_Master in objectSet
                            where Asset_Master.IT_ASSET_IS_ACTIVE == "1" && Asset_Master.IT_ASSET_IS_SCRAPED == "0" && Asset_Master.IT_ASSET_IS_SCRAP_FINAL == "0"
                            select Asset_Master;
                oc = new ObservableCollection<HRMS_IT_ASSET_MASTER>(value.ToList());
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message, "IT Portal Error", MessageBoxButton.OK, MessageBoxImage.Error, MessageBoxResult.OK);
            }
            return oc;
        }

并分配给 CollectionViewSource 如下

hRMS_IT_ASSET_MASTERViewSource.Source = Load_Asset_Master_Data(gRACHRMSEntities.HRMS_IT_ASSET_MASTER); 

通过这种方式,我可以进行过滤,但我失去了一个功能,因为当我填充数据网格末尾的行并按保存时,保存命令不考虑添加的行,保存命令仅对编辑操作的响应是保存事件处理程序

private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            try
            {                                               
                if (gRACHRMSEntities.SaveChanges() > 0)
                {
                    txtblkStatus.Text = "Changes has been saved.";                
                }
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error, MessageBoxResult.OK);

        }       }

我在网上查了一下,发现在使用时ObservableCollection<T>我必须IEditableObject为 T提供我自己的实现。

4

1 回答 1

0

我认为你应该写

hRMS_IT_ASSET_MASTERViewSource.ItemsSource =Load_Asset_Mast ...

代替:

hRMS_IT_ASSET_MASTERViewSource.Source =Load_Asset_Mast ...

我的意思是你应该设置 ItemsSource 。

于 2012-12-25T08:22:20.347 回答