XtraGrid是DXperience WinForms Subscription下的一個子控件，擁有豐富的菜單選項(xiàng)和網(wǎng)格視圖。下面為大家介紹如何在XtraGrid控件中自定義菜單，假設(shè)這個菜單的布局如下圖所示：

當(dāng)在DXperience WinForms網(wǎng)格視圖上右鍵單擊鼠標(biāo)，GridView.PopupMenuShowing事件被觸發(fā)，Menu參數(shù)就會指定要被調(diào)用的菜單。但注意，當(dāng)某一行被右擊時，XtraGrid不會顯示任何默認(rèn)的菜單，但PopupMenuShowing 事件仍然會被觸發(fā)，只不過它的Menu參數(shù)引用了一個空菜單。所以我們可以利用這個屬性添加自定義菜單。

在這個示例中，要創(chuàng)建下面3個菜單項(xiàng)：

• "Rows"子菜單顯示"Delete Row" 菜單項(xiàng)。這個子菜單由DXSubMenuItem類表示。
• "Delete Row"菜單項(xiàng)由 DXMenuItem類表示，單擊這個選項(xiàng)可以刪除選中的行。
• "Merging Enabled"菜單項(xiàng)由DXMenuCheckItem 類表示，單擊這個選項(xiàng)觸發(fā)GridOptionsView.AllowCellMerge選項(xiàng)，從而判斷單元格合并功能是否被啟用。

DXperience WinForms XtraGrid自定義菜單示例代碼：

using DevExpress.XtraGrid.Views.Grid;
using DevExpress.Utils.Menu;

// Occurs when right-clicking within a grid's view.
private void gridView1_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e) {
   GridView view = sender as GridView;
   // Check whether a row is right-clicked.
   if (e.MenuType == DevExpress.XtraGrid.Views.Grid.GridMenuType.Row) {
      int rowHandle = e.HitInfo.RowHandle;
      // Delete existing menu items, if any.
      e.Menu.Items.Clear();
      // Add a submenu with a single menu item.
      e.Menu.Items.Add(CreateRowSubMenu(view, rowHandle));
      // Add a check menu item.
      DXMenuItem item = CreateMergingEnabledMenuItem(view, rowHandle);
      item.BeginGroup = true;
      e.Menu.Items.Add(item);
   }
}

// Create a submenu with a single DeleteRow item.
DXMenuItem CreateRowSubMenu(GridView view, int rowHandle) {
   DXSubMenuItem subMenu = new DXSubMenuItem("Rows");
   DXMenuItem menuItemDeleteRow = new DXMenuItem("&Delete Row", 
     new EventHandler(OnDeleteRowClick), imageCollection1.Images[0]);
   menuItemDeleteRow.Tag = new RowInfo(view, rowHandle);         
   subMenu.Items.Add(menuItemDeleteRow);         
   return subMenu;
}

// Create a check menu item that triggers the Boolean AllowCellMerge option.
DXMenuCheckItem CreateMergingEnabledMenuItem(GridView view, int rowHandle) {
   DXMenuCheckItem checkItem = new DXMenuCheckItem("&Merging Enabled", 
     view.OptionsView.AllowCellMerge, null, new EventHandler(OnMergingEnabledClick));
   checkItem.Tag = new RowInfo(view, rowHandle);
   return checkItem;
}

//The handler for the DeleteRow menu item
void OnDeleteRowClick(object sender, EventArgs e) {
   DXMenuItem item = sender as DXMenuItem;
   RowInfo info = item.Tag as RowInfo;
   info.View.DeleteRow(info.RowHandle);
}

//The handler for the MergingEnabled menu item
void OnMergingEnabledClick(object sender, EventArgs e) {
   DXMenuCheckItem item = sender as DXMenuCheckItem;
   RowInfo info = item.Tag as RowInfo;
   info.View.OptionsView.AllowCellMerge = item.Checked;
}

//...

//The class that stores menu specific information
class RowInfo {
   public RowInfo(GridView view, int rowHandle) {
      this.RowHandle = rowHandle;
      this.View = view;
   }
   public GridView View;
   public int RowHandle;
}