wpf中ListView排序

<!--xaml-->

 <ListView Margin="51,54,70,64" x:Name="lvList" GridViewColumnHeader.Click="lvList_Click_1" ItemsSource="{Binding}"  >
            <ListView.View>
                <GridView >
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="50"></GridViewColumn>
                    <GridViewColumn Header="Age" DisplayMemberBinding="{Binding Age}" Width="50"></GridViewColumn>
                    <GridViewColumn Header="Email" DisplayMemberBinding="{Binding Email}" Width="50"></GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>

//后台代码
        private void lvList_Click_1(object sender, RoutedEventArgs e)
        {
            if (e.OriginalSource is GridViewColumnHeader)
            {
                //获得点击的列
                GridViewColumn clickedColumn = (e.OriginalSource as GridViewColumnHeader).Column;
                if (clickedColumn != null)
            
                {
                    //Get binding property of clicked column
                  
                    string bindingProperty = (clickedColumn.DisplayMemberBinding as Binding).Path.Path;
                    //获得listview项是如何排序的
                    SortDescriptionCollection sdc = this.lvList.Items.SortDescriptions;

                    //按升序进行排序
                    ListSortDirection sortDirection = ListSortDirection.Ascending;
                    if (sdc.Count > 0)
                    {
                        SortDescription sd = sdc[0];
                        sortDirection = (ListSortDirection)((((int)sd.Direction) + 1) % 2);
                        sdc.Clear();
                    }
                    sdc.Add(new SortDescription(bindingProperty, sortDirection));
                }
            }

        }