一些属性
[Bindable(true),
Category("Appearance"),
DefaultValue(""),
Description("The e-mail address.")]
可以通过内部控件的事件调用激活自定义事件
//添加控件属性 public string pp { get; set; } //添加事件,声明一个委托的事件,一个标准,转接到系统的event处理 public delegate void ppaction(object sender, EventArgs e); public event ppaction ppshow; public void ppac(object sender, EventArgs e) { if (ppshow != null) { ppshow(sender, e); } }以下为转载内容
以下是一个登陆框的代码,包括:用户名输入TextBox、密码输入TextBox、提交Button、重置Button以及承载以上四项的Panel。控件类名为LoginCtrl。 (例程使用C#) using System; using System.Web.UI; using System.Web.UI.WebControls; using System.ComponentModel; using System.Drawing; namespace TestLib { [DefaultProperty("BackColor"), ToolboxData("<{0}:LoginCtrl runat=server></{0}:LoginCtrl>")] public class LoginCtrl : System.Web.UI.WebControls.WebControl { private Color _fontColor = Color.Black;//声明字体颜色变量 private Color _backColor = Color.White;//声明控件背景变量 首先声明要在复合控件中使用的子控件。 private Label lblUserName = new Label();//显示“用户名”的Label控件 private Label lblPassWord = new Label();//显示“密码”的Label控件 private TextBox txtUserName = new TextBox();//用户名输入的TextBox控件 private TextBox txtPassWord = new TextBox();//密码输入的TextBox控件 private Button submitButton = new Button();//提交Button控件 private Button clearButton = new Button();//重置Button控件 private System.Web.UI.WebControls.Panel pnlFrame = new System.Web.UI.WebControls.Panel();//承载其它控件的容器Panel控件 当然要在符合控件中使用的事件一定要声明的,它们会出现在属性框的事件栏里。 public event EventHandler SubmitOnClick;//声明自定义控件LoginCtrl的提交事件 public event EventHandler ClearOnClick;//声明自定义控件LoginCtrl的重置事件 public LoginCtrl() { 刚刚声明的子控件和事件要在这里进行初始化处理。 //初始化控件的属性 this.lblUserName.Text = "用户名:"; this.lblPassWord.Text = "密 码:"; this.txtPassWord.TextMode = System.Web.UI.WebControls.TextBoxMode.Password; this.pnlFrame.Width = 240; this.pnlFrame.Height = 120; this.pnlFrame.BackColor = Color.Empty; //添加提交按钮点击事件 submitButton.Text = "确定"; submitButton.Click += new EventHandler(this.SubmitBtn_Click); //添加重置按钮点击事件 clearButton.Text = "重置"; clearButton.Click += new EventHandler(this.ClearBtn_Click); //将声明的各子控件添加到LoginCtrl中 this.Controls.Add(this.submitButton); this.Controls.Add(this.clearButton); this.Controls.Add(this.txtUserName); this.Controls.Add(this.txtPassWord); this.Controls.Add(this.lblUserName); this.Controls.Add(this.lblPassWord); this.Controls.Add(this.pnlFrame); } 根据自己的需要添加或重载符合控件的公共属性 //字体颜色属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Color ForeColor { get { return this._fontColor; } set { this._fontColor = value; } } //控件背景属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Color BackColor { get { return this._backColor; } set { this._backColor = value; } } //用户名属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public string UserName { get { return this.txtUserName.Text; } set { this.txtUserName.Text = value; } } //密码属性 [Bindable(false), Category("Appearance"), DefaultValue(""), Browsable(false)] public string PassWord { get { return this.txtPassWord.Text; } set { this.txtPassWord.Text = value; } } //控件宽度属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Unit Width { get { return this.pnlFrame.Width; } set { this.pnlFrame.Width = value; } } //控件高度属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Unit Height { get { return this.pnlFrame.Height; } set { this.pnlFrame.Height = value; } } //控件边框颜色属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Color BorderColor { get { return this.pnlFrame.BorderColor; } set { this.pnlFrame.BorderColor = value; } } //控件边框样式属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override BorderStyle BorderStyle { get { return this.pnlFrame.BorderStyle; } set { this.pnlFrame.BorderStyle = value; } } //控件边框宽度属性 [Bindable(false), Category("Appearance"), DefaultValue("")] public override Unit BorderWidth { get { return this.pnlFrame.BorderWidth; } set { this.pnlFrame.BorderWidth = value; } } 下面要把控件输出出去,展示在页面上。 /// <summary> /// 将此控件呈现给指定的输出参数。 /// </summary> /// <param name="output"> 要写出到的 HTML 编写器 </param> protected override void Render(HtmlTextWriter output) { this.pnlFrame.RenderBeginTag(output);//输出Panel控件 //在Panel中绘制表格 output.AddAttribute(HtmlTextWriterAttribute.Border,"0"); output.AddAttribute(HtmlTextWriterAttribute.Cellpadding,"0"); output.AddAttribute(HtmlTextWriterAttribute.Cellspacing,"0"); output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Width,"100%"); output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Height,"100%"); output.AddAttribute(HtmlTextWriterAttribute.Bgcolor,this._backColor.Name); output.RenderBeginTag(HtmlTextWriterTag.Table); output.RenderBeginTag(HtmlTextWriterTag.Tr); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加Label控件 this.lblUserName.ForeColor = this._fontColor; this.lblUserName.RenderControl(output); output.RenderEndTag(); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加TextBox控件 this.txtUserName.RenderControl(output); output.RenderEndTag(); output.RenderEndTag(); output.RenderBeginTag(HtmlTextWriterTag.Tr); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加Label控件 this.lblPassWord.ForeColor = this._fontColor; this.lblPassWord.RenderControl(output); output.RenderEndTag(); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加TextBox控件 this.txtPassWord.RenderControl(output); output.RenderEndTag(); output.RenderEndTag(); output.RenderBeginTag(HtmlTextWriterTag.Tr); output.AddAttribute(HtmlTextWriterAttribute.Align,"right"); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加Button控件 this.submitButton.RenderControl(output); output.RenderEndTag(); output.AddAttribute(HtmlTextWriterAttribute.Align,"center"); output.RenderBeginTag(HtmlTextWriterTag.Td); //在表格中添加Button控件 this.clearButton.RenderControl(output); output.RenderEndTag(); output.RenderEndTag(); output.RenderEndTag(); this.pnlFrame.RenderEndTag(output); } 当按钮点击时怎么做呢?这是个事件冒泡。 //处理提交按钮点击事件 private void SubmitBtn_Click(object sender, EventArgs e) { EventArgs e1 = new EventArgs(); if(this.SubmitOnClick!=null) this.SubmitOnClick(this.submitButton,e1); } //处理重置按钮点击事件 private void ClearBtn_Click(object sender, EventArgs e) { this.txtPassWord.Text = ""; this.txtUserName.Text = ""; EventArgs e1 = new EventArgs(); if(this.ClearOnClick!=null) this.ClearOnClick(this.clearButton,e1); } } }