双击DataGrid中的行，然后做一些事情，要点：
1、为DataGrid添加事件监听，而不是为每个DataGridRow添加事件监听；
2、双击的位置一般为单元格或单元格内的元素，所以这里牵涉到碰撞检测和父元素查找；
3、单元格内若有功能元素，如：删除按钮，复选按钮等。要规避点击冲突。
实现过程
1. 安装行为包
安装 Microsoft.Xaml.Behaviors.Wpf NuGet包
2. 父元素查找工具类
下面与是市面上见到的大多父元素查找不大一样，VisualTreeHelper.GetParent 遇到非 Visual 或 Visual3D 类型会抛出异常，此方法做了特殊处理。
public static class VisualHelper
{/// <summary>/// 查找父元素/// </summary>/// <typeparam name="T"></typeparam>/// <param name="element"></param>/// <param name="filter"></param>/// <returns></returns>public static T FindParent<T>(this DependencyObject element, Func<T, bool> filter = null) where T : DependencyObject{while (element != null){if (element is T && (filter == null || filter.Invoke(element as T))){return element as T;}// 安全的父元素获取DependencyObject parent = null;try{if (element is Visual || element is Visual3D){parent = VisualTreeHelper.GetParent(element);}else{parent = LogicalTreeHelper.GetParent(element);}}catch{parent = LogicalTreeHelper.GetParent(element);}element = parent;}return null;}
}
3. 自定义一个双击行行为
/// <summary>
/// 为DataGrid添加双击行行为
/// </summary>
public class DataGridRowDoubleClickBehavior : Behavior<DataGrid>
{public static readonly DependencyProperty CommandProperty =DependencyProperty.Register("Command", typeof(ICommand), typeof(DataGridRowDoubleClickBehavior));public ICommand Command{get { return (ICommand)GetValue(CommandProperty); }set { SetValue(CommandProperty, value); }}protected override void OnAttached(){base.OnAttached();AssociatedObject.PreviewMouseDoubleClick += OnPreviewMouseDoubleClick;}protected override void OnDetaching(){base.OnDetaching();AssociatedObject.PreviewMouseDoubleClick -= OnPreviewMouseDoubleClick;}private void OnPreviewMouseDoubleClick(object sender, MouseButtonEventArgs e){/*// 直接检查点击的是否是DataGridRowvar source = e.OriginalSource as DependencyObject;var row = source.FindParent<DataGridRow>();if (row == null){return;}*/var dataGrid = sender as DataGrid;if (dataGrid == null){return;}// 使用HitTest获取点击位置的实际元素var hitTestResult = VisualTreeHelper.HitTest(dataGrid, e.GetPosition(dataGrid));if (hitTestResult == null){return;}// 检查是否点击了按钮var button = hitTestResult.VisualHit.FindParent<Button>();if (button != null){// 如果是按钮，不处理行双击return;}var row = hitTestResult.VisualHit.FindParent<DataGridRow>();if (row == null){return;}// 处理行双击if (Command?.CanExecute(row.Item) == true){Command.Execute(row.Item);e.Handled = true;}}
}
4. 在XAML中使用
<DataGrid><i:Interaction.Behaviors><!--controls:ControlCommands.DoubleClick我这里是用的静态成员 你需要换成你的ViewModel中的命令--><core:DataGridRowDoubleClickBehavior Command="{x:Static controls:ControlCommands.DoubleClick}" /></i:Interaction.Behaviors>
</DataGrid>
大功告成。非MVVM模式，逻辑类似。不再介绍。