委托：手工引发委托链中异常的例子

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;

namespace  AspNetTest.Common
{
    /**//// <summary>
    /// Define_Delegate_handwork 的摘要说明。
    /// </summary>
    public class Define_Delegate_handwork : System.Web.UI.Page
    {
        private void Page_Load(object sender, System.EventArgs e)
        {
            MathOp mathOp = new MathOp(1,0);
    
            mathOp.opDelegate = null;
            mathOp.opDelegate += new MathOp.OpDelegate(OperateFunc.Add);
            mathOp.opDelegate += new MathOp.OpDelegate(OperateFunc.Subtract);
            mathOp.opDelegate += new MathOp.OpDelegate(OperateFunc.Divide);    
            mathOp.opDelegate += new MathOp.OpDelegate(OperateFunc.Multiply);

            object[] args = new object[2];
            args[0] = mathOp.Op1;
            args[1] = mathOp.Op2;
            Delegate[] operaters = mathOp.opDelegate.GetInvocationList();
            foreach(Delegate operater in operaters)
            {
                try
                {
                    operater.DynamicInvoke(args);
                }
                catch(Exception ex)
                {
                    Response.Write("<font color=red>被零除，引发一个异常，但并不影响委托链的其他实例运行！</font><br>" + "异常信息：<font color=gray>" + ex.Message + "</font><br><br>");
                }
            }
        }
        
        public class MathOp
        {
            public MathOp(int op1, int op2)
            {
                this.op1 = op1;
                this.op2 = op2;
            }
            public delegate void OpDelegate(int op1, int op2);
            public OpDelegate opDelegate;
            private int op1;
            private int op2;
            public int Op1
            {
                get
                {
                    return this.op1;
                }
            }
            public int Op2
            {
                get
                {
                    return this.op2;
                }
            }
        }
        
        public class OperateFunc
        {
            public static void Add(int op1, int op2)
            {
                int result = (int)op1+op2;
                HttpContext.Current.Response.Write("加：" + result + "<br>");
            }
            public static void Subtract(int op1, int op2)
            {
                int result = (int)op1-op2;
                HttpContext.Current.Response.Write("减：" + result + "<br>");
            }
            public static void Multiply(int op1, int op2)
            {
                int result = (int)op1*op2;
                HttpContext.Current.Response.Write("乘：" + result + "<br>");
            }
            //表示整除
            public static void Divide(int op1, int op2)
            {
                int result = (int)op1/op2;
                //注释该行，故意引发异常
                //return op2==0 ? 0 : (int)op1/op2;
                HttpContext.Current.Response.Write("除：" + result + "<br>");    
            }
        }
        
        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}