//数据显示器接口
public interface IShowCustomer
{
   IList GetCustomers(); //函数
   void ShowCustomers(IList customers); //方法
   void ShowCustomers(); //方法,重载
}

//数据显示器基类
public class ShowerBase : IShowCustomer
{
   public virtual IList GetCustomers()
   {
      return CustomerTester.GetCustomers();
   }
   
   //当没有指定数据源，作为预设的显示方法
   public void ShowCustomers()
   {
      IList customers = this.GetCustomers();
      
      //调用模板方法
      this.ShowCustomers(customers);
   }
   
   //虚方法,用于override
   //实现具体的业务逻辑
   public virtual void ShowCustomers(IList customers) { }
}

//用Listbox显示
public class ShowListBox : ShowerBase
{
   private ListBox _container;
   
   public ShowListBox(ListBox container)
   {
      _container = container;
   }
   
   //具体的业务逻辑
   public override void ShowCustomers(IList customers) //方法,复写override overload
   {
      _container.Items.Clear();
      foreach (object o in customers) _container.Items.Add(o);
   }
}

//用表格显示
public class ShowGridView : ShowerBase
{
   private DataGridView _gv;
   
   public ShowGridView(DataGridView gv)
   {
      _gv = gv;
   }
   
   //具体的业务逻辑
   public override void ShowCustomers(IList customers) //方法,复写override
   {
      _gv.DataSource = null;
      _gv.DataSource = customers;
   }
}

//用TreeView显示
public class ShowTreeView : ShowerBase
{
   private TreeView _view;
   
   public ShowTreeView(TreeView view)
   {
      _view = view;
   }
   
   //具体的业务逻辑
   public override void ShowCustomers(IList customers) //方法,复写override
   {
      _view.Nodes.Clear();
      TreeNode n;
      foreach (Customer c in customers)
      {
         n = _view.Nodes.Add(c.CustomerName);
         n.Nodes.Add(c.CustomerID);
         n.Nodes.Add(c.CustomerAddress);
      }
      _view.ExpandAll();
   }
}



// 来源:www.CSFramework.com, C/S结构框架学习网