老周：当RichEditBox控件的上下文菜单即将弹出时，会引发ContextMenuOpening事件，我们需要处理该事件，并且将e.Handled属性设置为true，这样才能阻止默认上下文菜单的弹出 在RichEditBox控件上声明附加的菜单项 ~~~ <RichEditBox Name="redit" Grid.Row="3" Margin="10,10,10,10" ContextMenuOpening="OnContextMenuOpening"> <FlyoutBase.AttachedFlyout> <MenuFlyout> <MenuFlyoutItem Text="复制" Click="OnCopy"/> <MenuFlyoutItem Text="剪切" Click="OnCut"/> <MenuFlyoutItem Text="粘贴" Click="OnPaste"/> <MenuFlyoutSeparator/> <MenuFlyoutSubItem Text="字号"> <MenuFlyoutItem Text="16" Tag="16" Click="OnFontSize" /> <MenuFlyoutItem Text="20" Tag="20" Click="OnFontSize"/> <MenuFlyoutItem Text="24" Tag="24" Click="OnFontSize" /> <MenuFlyoutItem Text="36" Tag="36" Click="OnFontSize"/> <MenuFlyoutItem Text="48" Tag="48" Click="OnFontSize"/> </MenuFlyoutSubItem> <!--分割--> <MenuFlyoutSeparator/> <ToggleMenuFlyoutItem Text="加粗" Click="OnBold" /> <MenuFlyoutSeparator/> <MenuFlyoutSubItem Text="下划线"> <MenuFlyoutItem Text="无" Tag="-1" Click="OnUnderline" /> <MenuFlyoutItem Text="单实线" Tag="0" Click="OnUnderline"/> <MenuFlyoutItem Text="双实线" Tag="1" Click="OnUnderline"/> <MenuFlyoutItem Text="虚线" Tag="2" Click="OnUnderline"/> </MenuFlyoutSubItem> <MenuFlyoutSeparator/> <MenuFlyoutSubItem Text="颜色"> <MenuFlyoutItem Text="黑色" Tag="黑色" Click="OnTinct"/> <MenuFlyoutItem Text="蓝色" Tag="蓝色" Click="OnTinct"/> <MenuFlyoutItem Text="白色" Tag="白色" Click="OnTinct"/> </MenuFlyoutSubItem> </MenuFlyout> </FlyoutBase.AttachedFlyout> </RichEditBox> ~~~ 处理OnContextMenuOpening ~~~ private void OnContextMenuOpening(object sender , ContextMenuEventArgs e) { //阻止弹出默认的上下文菜单，然后，调用ShowAt方法在指定的坐标处打开菜单 e.Handled = true; MenuFlyout menu = FlyoutBase.GetAttachedFlyout(redit) as MenuFlyout; menu?.ShowAt(redit , new Point(e.CursorLeft , e.CursorTop)); } ~~~ 处理复制粘贴 ~~~ private void OnCopy(object sender , RoutedEventArgs e) { //复制 redit.Document.Selection.Copy(); } private void OnCut(object sender , RoutedEventArgs e) { //剪切 redit.Document.Selection.Cut(); } private void OnPaste(object sender , RoutedEventArgs e) { //粘贴 redit.Document.Selection.Paste(0); //Paste 要在粘贴操作中使用的剪贴板格式。零表示最佳格式 } ~~~ 处理OnFontSize ~~~ /// <summary> /// 设置字体 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnFontSize(object sender , RoutedEventArgs e) { MenuFlyoutItem item = sender as MenuFlyoutItem; // 获取字号 float size = Convert.ToSingle(item.Tag); redit.Document.Selection.CharacterFormat.Size = size; } ~~~ ~~~ /// <summary> /// 加粗 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnBold(object sender , RoutedEventArgs e) { //using Windows.UI.Text; ToggleMenuFlyoutItem item = sender as ToggleMenuFlyoutItem; redit.Document.Selection.CharacterFormat.Bold = item.IsChecked ? FormatEffect.On : FormatEffect.Off; } private void OnUnderline(object sender , RoutedEventArgs e) { MenuFlyoutItem item = sender as MenuFlyoutItem; int x = Convert.ToInt32(item.Tag); UnderlineType unlinetp; switch (x) { case -1: // 无 unlinetp = UnderlineType.None; break; case 0: // 单实线 unlinetp = UnderlineType.Single; break; case 1: // 双实线 unlinetp = UnderlineType.Double; break; case 2: // 虚线 unlinetp = UnderlineType.Dash; break; default: unlinetp = UnderlineType.None; break; } redit.Document.Selection.CharacterFormat.Underline = unlinetp; } ~~~ ~~~ private void OnTinct(object sender , RoutedEventArgs e) { MenuFlyoutItem item = sender as MenuFlyoutItem; string tinct = item.Tag as string; Windows.UI.Color color = new Windows.UI.Color(); switch (tinct) { case "黑色": color= Windows.UI.Colors.Black; break; case "蓝色": color = Windows.UI.Colors.Blue; break; case "白色": color = Windows.UI.Colors.White; break; default: break; } redit.Document.Selection.CharacterFormat.BackgroundColor = color; } ~~~ 颜色在Windows.UI.Color 里面代码都是抄老周的  参考：[http://www.cnblogs.com/tcjiaan/p/4937301.html](http://www.cnblogs.com/tcjiaan/p/4937301.html)