有关外观模式见下面贴子，下面编写的一个例子。

FundClass.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace facadeTest1{

    
    public class StockClass
    {
        private string _StockName;
        public string StockName        {
            get { return _StockName; }
            set { _StockName = value; }
        }

        public StockClass(string stockname)
        {
            _StockName = stockname;
        }

        public string buy()
        {
            return string.Format("买入股票: [{0}] !", _StockName);
        }

        public string sell()
        {
            return string.Format("股票:[{0}] 卖出了!", _StockName);
        }
    }

    public class NationalDebtClass
    {
        private string _NationalDebtName;
        public string NationalDebtName        {
            get { return _NationalDebtName; }
            set { _NationalDebtName = value; }
        }

        public NationalDebtClass(string nationaldebtName)
        {
            _NationalDebtName = nationaldebtName;
        }

        public string buy()
        {
            return string.Format("买入国债: [{0}] !", _NationalDebtName);
        }

        public string sell()
        {
            return string.Format("国债: [{0}] 卖出了!", _NationalDebtName);
        }
    }

    public class RealtyClass
    {
        private string _RealtyName;
        public string RealtyName        {
            get { return _RealtyName; }
            set { _RealtyName = value; }
        }

        public RealtyClass(string realtryname)
        {
            _RealtyName = realtryname;
        }

        public string buy()
        {
            return string.Format("买入房地产: [{0}] !", _RealtyName);
        }

        public string sell()
        {
            return string.Format("产地产: [{0}] 卖出了!", _RealtyName);
        }
    }


    class FundClass
    {
        public ChangeUI onChange = null;

        public string msgInfo;
        StockClass stock1;
        StockClass stock2;
        NationalDebtClass nationalDebt1;
        RealtyClass realty1;

        public FundClass()
        {
            stock1 = new StockClass("新旺达新能源科技有限公司");
            stock2=new StockClass("爱康电子科技有限公司");
            nationalDebt1=new NationalDebtClass("中国人民银行国债");
            realty1=new RealtyClass("武汉房地产");
        }

        public void buy()
        {
            msgInfo = string.Format(
                stock1.buy()+Environment.NewLine+
                stock2.buy()+Environment.NewLine+
                nationalDebt1.buy()+Environment.NewLine+
                realty1.buy()+Environment.NewLine                );
            if (onChange != null)
                onChange();
        }

        public void sell()
        {
            msgInfo = string.Format(
               stock1.sell() + Environment.NewLine +
               stock2.sell() + Environment.NewLine +
               nationalDebt1.sell() + Environment.NewLine +
               realty1.sell() + Environment.NewLine               );
            if (onChange != null)
                onChange();
        }


    }}

Delegate.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace facadeTest1{
    public delegate void ChangeUI();}

MVcontrol.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows.Forms;namespace facadeTest1{
    class MVcontrol
    {
        private FundClass _fclass1;
        public MVcontrol(FundClass paramFundClass)
        {
            _fclass1 = paramFundClass;
        }

        public void UpdateUI(RichTextBox richControl)
        {
            richControl.Text = _fclass1.msgInfo;
        }
    }}

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace facadeTest1{
    public partial class MainForm : Form    {
        FundClass fund;
        MVcontrol mvc;
        public MainForm()
        {
            InitializeComponent();
            fund = new FundClass();
            fund.onChange = onChange;
            mvc = new MVcontrol(fund);

            btnBuy.Click += new EventHandler(btnBuy_Click);
            btnSell.Click += new EventHandler(btnSell_Click);
        }

        void btnSell_Click(object sender, EventArgs e)
        {
            fund.sell();
        }

        void btnBuy_Click(object sender, EventArgs e)
        {
            fund.buy();
        }

        public void onChange()
        {
            mvc.UpdateUI(this.richTextBox1);
        }

        private void btnSell_Click_1(object sender, EventArgs e)
        {

        }
    }}