自定义组件 - angushine

/*

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Beads - UK wholesale beads,buttons and jewelry making supplies-eezyco.co.uk</title>
  <style type="text/css">
button { padding:0;margin:0;border:0;background:none;text-indent:inherit; }
* html button { width:1%;overflow:visible;margin:0 5px 0 0; }
button .btn { background:url(https://securepics.ebaystatic.com/aw/pics/buttons/btnViPrmry.gif);color:#fff;font-family:Arial;font-weight:bold;white-space:nowrap;cursor:pointer;display:block;height:24px;line-height:190%;padding:0 0 0 6px;vertical-align:middle; }
button .btn .btn { padding:0 20px 0 14px; }
.SIActBtn .btn { background:url(https://securepics.ebaystatic.com/aw/pics/viewitem/imgVIPrmryBtnLt.gif) no-repeat top left; }
.SIActBtn .btn .btn { background:url(https://securepics.ebaystatic.com/aw/pics/buttons/btnViPrmry.gif) no-repeat right;background-position:100% 0; }
  </style>
</head>
<body>
<div>
<button type="submit" tabindex="3" class="SIActBtn"><span class="btn"><span class="btn">Next, Please Confirm Your Cart</span></span></button>
</div>
</body>
</html>

*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace WebControls
{
    /// <summary>
    /// 按钮
    /// </summary>
    [DefaultProperty("Text")]
    public class CButton : WebControl, IPostBackEventHandler
    {
        private static readonly object ClickEvent = new object();

        /// <summary>
        /// 单击事件
        /// </summary>
        public event EventHandler Click
        {
            add
            {
                Events.AddHandler(ClickEvent, value);
            }
            remove
            {
                Events.AddHandler(ClickEvent, value);
            }
        }

        /// <summary>
        /// 定义
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnClick(EventArgs e)
        {
            EventHandler clickEvent = Events[ClickEvent] as EventHandler;
            if (clickEvent != null)
            {
                clickEvent(this, e);
            }
        }

        /// <summary>
        /// 执行事件
        /// </summary>
        /// <param name="eventArgument"></param>
        public void RaisePostBackEvent(string eventArgument)
        {
            OnClick(new EventArgs());
        }

        /*// Defines the Click event.
        public event EventHandler Click;

        //Invoke delegates registered with the Click event.
        protected virtual void OnClick(EventArgs e)
        {
            if (Click != null)
            {
                Click(this, e);
            }
        }

        // Define the method of IPostBackEventHandler that raises change events.
        public void RaisePostBackEvent(string eventArgument)
        {
            OnClick(new EventArgs());
        }*/

        /// <summary>
        /// Text属性
        /// </summary>
        [Description("Text"), Bindable(false), Category("Appearance"), DefaultValue("Button")]
        public string Text
        {
            get { return ViewState[this.UniqueID + "_Text"].ToString(); }
            set { ViewState[this.UniqueID + "_Text"] = value; }
        }

        /// <summary>
        /// 生成标记
        /// </summary>
        protected override HtmlTextWriterTag TagKey
        {
            get { return HtmlTextWriterTag.Button; }
        }

        /// <summary>
        /// 增加属性
        /// </summary>
        /// <param name="writer"></param>
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            base.AddAttributesToRender(writer);
            writer.AddAttribute("class", "SIActBtn");
        }

        /// <summary>
        /// 增加子控件
        /// </summary>
        protected override void CreateChildControls()
        {
            base.CreateChildControls();
            Literal lt = new Literal();
            lt.Text = string.Format("<span class=\"btn\"><span class=\"btn\">{0}</span></span>", this.Text);
            this.Controls.Add(lt);
        }

        /// <summary>
        /// 生成Button
        /// </summary>
        /// <param name="writer"></param>
        protected override void Render(HtmlTextWriter writer)
        {
            if (Page != null)
            {
                Page.VerifyRenderingInServerForm(this);  //确保此控件在form表单内
            }
            EventHandler clickEvent = (EventHandler)Events[ClickEvent];
            if (clickEvent != null)
            {
                string js = "";
                if (this.Attributes["OnClick"] != null)
                {
                    js = this.Attributes["OnClick"].ToString();
                    if (!js.EndsWith(";"))
                        js += ";";
                }
                this.Attributes.Add("OnClick", js + Page.ClientScript.GetPostBackEventReference(this, null, true));
            }
            base.Render(writer);
            //writer.Write(string.Format("<button type=\"submit\" class=\"SIActBtn\"><span class=\"btn\"><span class=\"btn\">{0}</span></span></button>", Text));
        }
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="button.aspx.cs" Inherits="Web.button" %>
<%@ Register Assembly="WebControls" Namespace="WebControls" TagPrefix="ht" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Untitled Page</title>
  <style type="text/css">
     button { padding:0;margin:0;border:0;background:none;text-indent:inherit; }
     * html button { width:1%;overflow:visible;margin:0 5px 0 0; }
     button .btn { background:url(images/btnViPrmry.gif);color:#fff;font-family:Arial;font-weight:bold;white-space:nowrap;cursor:pointer;display:block;height:24px;line-height:190%;padding:0 0 0 6px;vertical-align:middle; }
     button .btn .btn { padding:0 20px 0 14px; }
     .SIActBtn .btn { background:url(images/imgVIPrmryBtnLt.gif) no-repeat top left; }
     .SIActBtn .btn .btn { background:url(images/btnViPrmry.gif) no-repeat right;background-position:100% 0; }
  </style>
</head>
<body>
  <form id="form" runat="server">
  <asp:Literal ID="lt" runat="server" />
  <ht:CButton ID="CButton" runat="server" Text="Next, Please Click Me!" onclick="CButton_Click"/><br />
  <button class="SIActBtn"><span class="btn"><span class="btn">Next, Please Confirm Your Cart</span></span></button><br />

  <ht:MyButton ID="MyButton" runat="server" onclick="CButton_Click"/><br />
  </form>
</body>
</html>

/// <summary>
/// 加载样式和JavaScript
/// </summary>
/// <param name="e"></param>
protected override void OnPreRender(EventArgs e)
{
    string strCss = this.Page.ClientScript.GetWebResourceUrl(this.GetType(), "WebControls.style.css");
    string strCssLink = string.Format("<link type=\"text/css\" rel=\"stylesheet\" href=\"{0}\"/>", strCss);
    Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "Css", strCssLink);
    base.OnPreRender(e);
}