web控件开发系列(五) 控件事件

控件在WEB开发时经常要用到，虽然有部分已经存在工具箱里，但有时总需要根据自己的要求，开发一些合适自己的控件。接上一节,已经说过了控件的属性,下面来说一下,控件里面究竟怎样定义事件呢? 首先，大家都知道，控件里面的子控件可能会有需要事件，也就是子控件在事件中处理业务流程，还有就是控件本身就需要事件，像button那样，有常用的click事件，那么我们自定义的控件是否有需要这方面的事件存在呢？如果需要应该怎样添加呢？下面介绍一下，控件里面子控件的事件，例如我们在web页面上需要一个简单计数器给用户进行+ - * /这四个操作，下面介绍一下实现的代码，在ServerControl里面添加一个Caler的类。

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ServerControl
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:Caler runat=server></{0}:Caler>")]
    public class Caler : CompositeControl
    {
        private TextBox txt1;   //计算的第一个数
        private TextBox txt2;   //计算的第二个数
        private TextBox txt3;   //计算的结果
        private Button btn1;  //加
        private Button btn2;  //减
        private Button btn3;  //乘
        private Button btn4;  //除

        //关于控件文本框只能输入数字的判断大家自己加进,这里只实现用户前提是输入数字的情况下,
        //也不包括长度,因为我在textbox中只设了10的长度,多出部分会去掉,实际开发中还需要加进好
        //多的判断,这些由大家去添加吧..这里只说明怎样添加控件的事件而已

        private Unit ButtonWidth = Unit.Pixel(30);

        protected override void CreateChildControls()
        {
            this.Controls.Clear();

            txt1 = new TextBox();
            txt1.ID = "txt1";
            txt1.MaxLength = 10;
            this.Controls.Add(txt1);

            txt2 = new TextBox();
            txt2.ID = "txt2";
            txt2.MaxLength = 10;
            this.Controls.Add(txt2);

            txt3 = new TextBox();
            txt3.ID = "txt3";
            txt3.MaxLength = 10;
            this.Controls.Add(txt3);

            btn1 = new Button();
            btn1.ID = "btn1";
            btn1.Text = "+";
            btn1.Click += new EventHandler(btn1_Click);  //添加事件
            this.Controls.Add(btn1);

            btn2 = new Button();
            btn2.ID = "btn2";
            btn2.Text = "-";
            btn2.Click += new EventHandler(btn2_Click);
            this.Controls.Add(btn2);

            btn3 = new Button();
            btn3.ID = "btn3";
            btn3.Text = "*";
            btn3.Click += new EventHandler(btn3_Click);
            this.Controls.Add(btn3);

            btn4 = new Button();
            btn4.ID = "btn4";
            btn4.Text = "/";
            btn4.Click += new EventHandler(btn4_Click);
            this.Controls.Add(btn4);
            this.ChildControlsCreated = true;
        }

        protected override void RecreateChildControls()
        {
            if (this.ChildControlsCreated == false)
            {
                base.RecreateChildControls();
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");
            writer.RenderBeginTag(HtmlTextWriterTag.Table);

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.txt1.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.txt2.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.txt3.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.btn1.RenderControl(writer);
            this.btn2.RenderControl(writer);
            this.btn3.RenderControl(writer);
            this.btn4.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderEndTag();

            writer.RenderEndTag();
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            if (this.txt1.Text.Trim().Length > 0 && this.txt2.Text.Trim().Length > 0)
            {
                txt3.Text = (Convert.ToDouble(txt1.Text) / Convert.ToDouble(txt2.Text)).ToString();
            }
            else
            {
                txt3.Text = "";
            }
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            if (this.txt1.Text.Trim().Length > 0 && this.txt2.Text.Trim().Length > 0)
            {
                txt3.Text = (Convert.ToDouble(txt1.Text) * Convert.ToDouble(txt2.Text)).ToString();
            }
            else
            {
                txt3.Text = "";
            }
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            if (this.txt1.Text.Trim().Length > 0 && this.txt2.Text.Trim().Length > 0)
            {
                txt3.Text = (Convert.ToDouble(txt1.Text) - Convert.ToDouble(txt2.Text)).ToString();
            }
            else
            {
                txt3.Text = "";
            }
        }

        private void btn1_Click(object sender, EventArgs e)
        {
            if (this.txt1.Text.Trim().Length > 0 && this.txt2.Text.Trim().Length > 0)
            {
                txt3.Text = (Convert.ToDouble(txt1.Text) + Convert.ToDouble(txt2.Text)).ToString();
            }
            else
            {
                txt3.Text = "";
            }
        }
    }
}

编译，在页面上拖进控件，运行你就会发现下面的页面：


通过上面发现，和我们平时页面控件子控件事件差不多吧。都是在控件生成的时候，添加控件事件。
下面介如一下，控件的事件，在ServerControl中添加一个类叫userRegister,再把下面的代码添加进去

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace ServerControl
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:userRegister runat=server></{0}:userRegister>")]
    public class userRegister : CompositeControl
    {
        #region Conrol
        private Label lbU;
        private Label lbP;
        private Label lbCheckName;
        private Label lbCheck;
        private Label lbError;
        private TextBox userName;
        private TextBox passWord;
        private TextBox check;
        private Button btnLogin;
        private Button btnClear;
        private RegularExpressionValidator userNameRev;
        private RegularExpressionValidator passWordRev;
        #endregion

        #region settingControl
        [Category("LabelTextBox")]   //登陆按钮名称
        [Description("登陆按钮信息显示")]
        public string btnLoginTitle
        {
            get 
            {
                this.EnsureChildControls();
                return this.btnLogin.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.btnLogin.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("登陆按钮的宽度")]
        public Unit btnLoginWidth
        {
            get 
            {
                this.EnsureChildControls();
                return this.btnLogin.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.btnLogin.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("登陆按钮的宽度")]
        public Unit btnLoginHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.btnLogin.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.btnLogin.Height = value;
            }
        }

        [Category("LabelTextBox")]   //取消按钮名称
        [Description("取消按钮信息显示")]
        public string btnClearTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.btnClear.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.btnClear.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("取消按钮的宽度")]
        public Unit btnClearWidth
        {
            get
            {
                this.EnsureChildControls();
                return this.btnClear.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.btnClear.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("取消按钮的宽度")]
        public Unit btnClearHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.btnClear.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.btnClear.Height = value;
            }
        }

        [Category("LabelTextBox")]   //账号显示名称
        [Description("账号标签信息显示")]
        public string lbUTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.lbU.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.lbU.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("账号标签的宽度")]
        public Unit lbUWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.lbU.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.lbU.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("账号标签的高度")]
        public Unit lbUHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.lbU.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.lbU.Height = value;
            }
        }

        [Category("LabelTextBox")]   //密码显示名称
        [Description("密码标签信息显示")]
        public string lbPTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.lbP.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.lbP.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("密码标签的宽度")]
        public Unit lbPWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.lbP.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.lbP.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("密码标签的高度")]
        public Unit lbPHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.lbP.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.lbP.Height = value;
            }
        }

        [Category("LabelTextBox")]   //验证显示名称
        [Description("验证标签信息显示")]
        public string lbCheckTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheck.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheck.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证标签的宽度")]
        public Unit lbCheckWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheck.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheck.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证标签的高度")]
        public Unit lbCheckHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheck.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheck.Height = value;
            }
        }

        [Category("LabelTextBox")]   //验证显示名称
        [Description("验证名称标签信息显示")]
        public string lbCheckNameTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheckName.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheckName.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证名称标签的宽度")]
        public Unit lbCheckNameWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheckName.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheckName.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证名称标签的高度")]
        public Unit lbCheckNameHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.lbCheckName.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.lbCheckName.Height = value;
            }
        }

        [Category("LabelTextBox")]   //错误显示名称
        [Description("错误标签信息显示")]
        public string lbErrorTitle
        {
            get
            {
                this.EnsureChildControls();
                return this.lbError.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.lbError.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("错误标签的宽度")]
        public Unit lbErrorWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.lbError.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.lbError.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("错误标签的高度")]
        public Unit lbErrorHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.lbError.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.lbError.Height = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("错误标签的高度")]
        public Color lbErrorFontColor
        {
            get
            {
                this.EnsureChildControls();
                return this.lbError.ForeColor;
            }
            set
            {
                this.EnsureChildControls();
                this.lbError.ForeColor = value;
            }
        }

        [Category("LabelTextBox")]   //账号
        [Description("账户号码")]
        public string userNameValue
        {
            get
            {
                this.EnsureChildControls();
                return this.userName.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.userName.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("账号文本框宽度")]
        public Unit userNameWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.userName.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.userName.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("账号文本框高度")]
        public Unit userNameHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.userName.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.userName.Height = value;
            }
        }

        [Category("LabelTextBox")]   //验证码
        [Description("验证码文本")]
        public string checkValue
        {
            get
            {
                this.EnsureChildControls();
                return this.check.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.check.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证码文本框宽度")]
        public Unit checkWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.check.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.check.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证码文本框高度")]
        public Unit checkHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.check.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.check.Height = value;
            }
        }


        [Category("Security")]  //密码
        [Description("密码")]
        [PasswordPropertyText(true)]
        public string passWordValue
        {
            get
            {
                this.EnsureChildControls();
                return this.passWord.Text;
            }
            set
            {
                this.EnsureChildControls();
                this.passWord.Text = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("密码文本框宽度")]
        public Unit passWordWitdth
        {
            get
            {
                this.EnsureChildControls();
                return this.passWord.Width;
            }
            set
            {
                this.EnsureChildControls();
                this.passWord.Width = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("密码文本框高度")]
        public Unit passWordHeight
        {
            get
            {
                this.EnsureChildControls();
                return this.passWord.Height;
            }
            set
            {
                this.EnsureChildControls();
                this.passWord.Height = value;
            }
        }

        [Category("LabelTextBox")]  //表达式
        [Description("验证表账号达式")]
        public string userNameValidateExpression
        {
            get
            {
                this.EnsureChildControls();
                return userNameRev.ValidationExpression;
            }
            set
            {
                this.EnsureChildControls();
                this.userNameRev.ValidationExpression = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证账号错误提示")]
        public string userNameErrorMessage
        {
            get
            {
                this.EnsureChildControls();
                return userNameRev.ErrorMessage;
            }
            set
            {
                this.EnsureChildControls();
                this.userNameRev.ErrorMessage = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证表账号达式")]
        public string passWordValidateExpression
        {
            get
            {
                this.EnsureChildControls();
                return passWordRev.ValidationExpression;
            }
            set
            {
                this.EnsureChildControls();
                this.passWordRev.ValidationExpression = value;
            }
        }

        [Category("LabelTextBox")]
        [Description("验证账号错误提示")]
        public string passWordErrorMessage
        {
            get
            {
                this.EnsureChildControls();
                return passWordRev.ErrorMessage;
            }
            set
            {
                this.EnsureChildControls();
                this.passWordRev.ErrorMessage = value;
            }
        }
        #endregion

        public userRegister()
        {
        }

        protected override void CreateChildControls()
        {

            Random random = new Random();
            this.Controls.Clear();
            //label lbCheck
            lbCheck = new Label();
            this.lbCheck.ID = "lbCheck1";
            this.lbCheck.Width = Unit.Pixel(35);
            this.lbCheck.Height = Unit.Pixel(20);
            this.lbCheck.Text = random.Next(9999).ToString("0000");
            this.Controls.Add(lbCheck);

            //label lbCheckName
            lbCheckName = new Label();
            this.lbCheckName.ID = "lbCheckName1";
            this.lbCheckName.Width = Unit.Pixel(60);
            this.lbCheckName.Height = Unit.Pixel(20);
            this.lbCheckName.Text = "验证码:";
            this.Controls.Add(lbCheckName);

            //lbError
            lbError = new Label();
            this.lbError.ID = "lbError1";
            this.lbError.Width = Unit.Pixel(60);
            this.lbError.Height = Unit.Pixel(20);
            this.lbError.Text = "";
            this.lbError.ForeColor = Color.Red;
            this.Controls.Add(lbError);

            //btnLogin
            btnLogin = new Button();
            this.btnLogin.ID = "btnLogin1";
            this.btnLogin.Width = Unit.Pixel(45);
            this.btnLogin.Height = Unit.Pixel(20);
            this.btnLogin.Click += new EventHandler(this.btnLoginClick);
            this.btnLogin.Text = "登陆";
            this.Controls.Add(btnLogin);

            //btnClear
            btnClear = new Button();
            this.btnClear.ID = "btnClear1";
            this.btnClear.Width = Unit.Pixel(45);
            this.btnClear.Height = Unit.Pixel(20);
            this.btnClear.Click += new EventHandler(this.btnClearClick);
            this.btnClear.Text = "取消";
            this.Controls.Add(btnClear);

            //Label lbU
            lbU = new Label();
            this.lbU.ID = "lbU1";
            this.lbU.Text = "账号: ";
            this.lbU.Height = Unit.Pixel(20);
            this.lbU.Width = Unit.Pixel(50);
            this.Controls.Add(lbU);

            //Label lbP
            lbP = new Label();
            this.lbP.ID = "lbP1";
            this.lbP.Text = "密码: ";
            this.lbP.Height = Unit.Pixel(20);
            this.lbP.Width = Unit.Pixel(50);
            this.Controls.Add(lbP);

            //TextBox userName
            userName = new TextBox();
            this.userName.ID = "userName1";
            this.userName.Height = Unit.Pixel(20);
            this.userName.Width = Unit.Pixel(150);
            this.Controls.Add(userName);

            //TextBox check
            check = new TextBox();
            this.check.ID = "Check1";
            this.check.Width = Unit.Pixel(100);
            this.check.Height = Unit.Pixel(20);
            this.Controls.Add(check);

            //TextBox passWord
            passWord = new TextBox();
            this.passWord.ID = "passWord1";
            this.passWord.Height = Unit.Pixel(20);
            this.passWord.Width = Unit.Pixel(150);
            this.Controls.Add(passWord);

            //RegularExpressionValidator userNameRev
            userNameRev = new RegularExpressionValidator();
            this.userNameRev.ID = "userNameRev1";
            this.userNameRev.ControlToValidate = this.userName.ID;
            this.userNameRev.ErrorMessage = "账号输入有错";
            this.userNameRev.Display = ValidatorDisplay.Static;
            this.Controls.Add(userNameRev);

            //RegularExpressionValidator passWordRev
            passWordRev = new RegularExpressionValidator();
            this.passWordRev.ID = "passWordRev1";
            this.passWordRev.ControlToValidate = this.passWord.ID;
            this.passWordRev.ErrorMessage = "账号输入有错";
            this.passWordRev.Display = ValidatorDisplay.Static;
            this.Controls.Add(passWordRev);
            this.ChildControlsCreated = true;
        }

        public event EventHandler btnLogin_Click;
        public event EventHandler btnClear_Click;

        private void btnLoginClick(object sender, EventArgs e)
        {
            if (this.btnLogin_Click != null)
            {
                this.btnLogin_Click(this, e);
            }
        }

        private void btnClearClick(object sender, EventArgs e)
        {
            if (this.btnClear_Click != null)
            {
                this.btnClear_Click(this, e);
            }
        }

        protected override void RecreateChildControls()
        {
            if (this.ChildControlsCreated == false)
            {
                base.RecreateChildControls();
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, " 0");
            writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");
            writer.RenderBeginTag(HtmlTextWriterTag.Table);

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);  //第一行userName
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.lbU.RenderControl(writer);
            writer.RenderEndTag();
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.userName.RenderControl(writer);
            writer.RenderEndTag();
            if (string.IsNullOrEmpty(this.userNameValidateExpression) == false && this.DesignMode == false)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                this.userNameRev.RenderControl(writer);
                writer.RenderEndTag();
            }
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);  //第二行passWord
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.lbP.RenderControl(writer);
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.passWord.RenderControl(writer);
            writer.RenderEndTag();

            if (string.IsNullOrEmpty(this.passWordValidateExpression) == false && this.DesignMode == false)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                this.passWordRev.RenderControl(writer);
                writer.RenderEndTag();
            }

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);  //第三行验证
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.lbCheckName.RenderControl(writer);            
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.check.RenderControl(writer);
            this.lbCheck.RenderControl(writer);
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);  //第四行按钮
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.btnLogin.RenderControl(writer);
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.btnClear.RenderControl(writer);
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);  //第五行错误提示
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            this.lbError.RenderControl(writer);
            writer.RenderEndTag();

            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            writer.RenderEndTag();

            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderEndTag();
        }
    }
}

编译，然后添加控件到页面，查看控件的事件，你会发现有二个你自己的定义的事件在里面了，点击二个事件中的一个，到代码界面，输入你要的代码。

protected void userRegister1_btnClear_Click(object sender, EventArgs e)
        {
            Response.Write("事件btnClear执行了");
        }

        protected void userRegister1_btnLogin_Click(object sender, EventArgs e)
        {
            Response.Write("事件btnLogin执行了");
        }

运行你就知道效果了。。本来还想插入一个图片的，但不知为什么现在浏览器特慢，快死掉了，我感觉到应该是上面那个代码生成的图片太大了，占用资源，大家亲自写一个自己喜欢的控件吧,把事件添加进去,多动手才会有提高,刚看是没用的,看的时候你感觉好简单,到自己做的时候问题就出现好多了.