WPF学习笔记（5）：两个DataGrid的滚动条实现同步滚动（转）

效果

效果：两个DataGrid的滚动条实现同步滚动。

代码参考了博客园chuncn的文章《.net中同步多个ScrollViewer滚动的四种方法》，原文是针对ListBox的。现改为针对DataGrid，略微作了修改，代码以水平滚动条为例。

原文地址：/chuncn/archive//10/08/275.html

实现方法：

方法一：利用DependencyProperty类的RegisterAttached方法，在属性系统上注册附加属性，并将滚动条属性值HorizontalOffset通过注册属性关联到一个方法。

ScrollViewer sv1, sv2;private void Window_Loaded(object sender, RoutedEventArgs e){//分别获取两个DataGrid的ScrollViewer

sv1 = VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(this.DataGrid1, 0), 0) as ScrollViewer;sv2 = VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(this.DataGrid2, 0), 0) as ScrollViewer;//将滚动条属性值HorizontalOffset关联到OnScrollChanged1方法

var offsetChangeListener =DependencyProperty.RegisterAttached("ListenerOffset1", typeof(object), typeof(UserControl), new PropertyMetadata(OnScrollChanged1));var binding = new Binding("HorizontalOffset") { Source = sv1 };sv1.SetBinding(offsetChangeListener, binding);offsetChangeListener =DependencyProperty.RegisterAttached("ListenerOffset2", typeof(object), typeof(UserControl), new PropertyMetadata(OnScrollChanged2));binding = new Binding("HorizontalOffset") { Source = sv2 };sv2.SetBinding(offsetChangeListener, binding);}public void OnScrollChanged1(DependencyObject sender, DependencyPropertyChangedEventArgs e){double a = (double)e.NewValue; //获取滚动条位置变化后的属性值sv2.ScrollToHorizontalOffset(a);}public void OnScrollChanged2(DependencyObject sender, DependencyPropertyChangedEventArgs e){double a = (double)e.NewValue;sv1.ScrollToHorizontalOffset(a);}

方法二：利用滚动条的ScrollChanged事件，同步两个滚动条的位置。

ScrollViewer sv1, sv2;

private void Window_Loaded(object sender, RoutedEventArgs e){//分别获取两个DataGrid的ScrollViewersv1 = VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(this.DataGrid1, 0), 0) as ScrollViewer;sv2 = VisualTreeHelper.GetChild(VisualTreeHelper.GetChild(this.DataGrid2, 0), 0) as ScrollViewer;//关联ScrollChanged事件sv1.ScrollChanged += new ScrollChangedEventHandler(sv1_ScrollChanged);sv2.ScrollChanged += new ScrollChangedEventHandler(sv2_ScrollChanged);}void sv1_ScrollChanged(object sender, ScrollChangedEventArgs e){sv2.ScrollToHorizontalOffset(sv1.HorizontalOffset);}void sv2_ScrollChanged(object sender, ScrollChangedEventArgs e){sv1.ScrollToHorizontalOffset(sv2.HorizontalOffset);}