Question

当DataGrid.ItemsSource == null时，如何实现自定义排序？我已经使用DataGrid.Items.Add（）以递增方式将项添加到DataGrid而不是分配ItemsSource，因此我的ItemsSource似乎总是为null。我想使用像这样的排序处理程序（下面）但（（DataGrid）发送者）.ItemsSource始终为null。怎么办？

public void SortHandler(object sender, DataGridSortingEventArgs e)
    {
        DataGridColumn column = e.Column;

        if (column.DisplayIndex == 1)
        {
            IComparer comparer = null;

            //i do some custom checking based on column to get the right comparer
            //i have different comparers for different columns. I also handle the sort direction
            //in my comparer

            // prevent the built-in sort from sorting
            e.Handled = true;

            ListSortDirection direction = (column.SortDirection != ListSortDirection.Ascending) ? ListSortDirection.Ascending : ListSortDirection.Descending;

            //set the sort order on the column
            column.SortDirection = direction;

            //use a ListCollectionView to do the sort.
            ListCollectionView lcv = (ListCollectionView)CollectionViewSource.GetDefaultView(((DataGrid)sender).ItemsSource);                

            //this is my custom sorter it just derives from IComparer and has a few properties
            //you could just apply the comparer but i needed to do a few extra bits and pieces
            comparer = new MySort(direction, column);

            //apply the sort
            lcv.CustomSort = comparer;
        }
        else
        {
            e.Handled = false;
        }
    }

Answer 1

WPF的强大功能是绑定支持，所以为什么不使用它。因此，我建议您将dataGrid的ItemSource绑定到类中的ObservableCollection，并将项添加到此集合中。

使用ObservableCollection实现的INotifyCollectionChanged带来的好处，这样您就不必担心UI刷新问题了。添加项目后，项目将在您的UI上更新。

此外，您可以使用CollectionViewSource。请参阅此文章 - http://bea.stollnitz.com/blog/?p=387

当ItemsSource == null时，如何在DataGrid列上执行自定义排序？

1 个答案: