Asp.net 2.0 制作复合控件示例(二)[示例代码下载]

  (一). 概述   通过制作一个<计算器>功能自定义复合控件演示复合控件的制作(二). 代码   1. 核心控件实现代码文件ComputeControl.cs  1

using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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namespace KingControls
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{
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    public class ComputeControl : System.Web.UI.WebControls.CompositeControl
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{
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        //操作数
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        private TextBox tb1;
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        private TextBox tb2;
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        //显示结果
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        private Label lb;
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        //操作(+-*/)
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        private Button bt1;
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        private Button bt2;
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        private Button bt3;
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        private Button bt4;
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        protected override void CreateChildControls()
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{
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            tb1 = new TextBox();
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            tb1.ID = "TextBox1";
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            this.Controls.Add( tb1 );
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            tb2 = new TextBox();
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            tb2.ID = "TextBox2";
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            this.Controls.Add(tb2);
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            lb = new Label();
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            lb.ID = "Label1";
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            lb.BackColor = System.Drawing.Color.YellowGreen;
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            lb.Text = "Result: ";
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            this.Controls.Add( lb );
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            bt1 = new Button();
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            bt1.ID = "Button1";
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            bt1.Text = "+";
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            bt1.CommandArgument = "+";
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            bt1.Click += new EventHandler(bt_Click);
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            this.Controls.Add( bt1 );
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            bt2 = new Button();
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            bt2.ID = "Button2";
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            bt2.Text = "-";
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            bt2.CommandArgument = "-";
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            bt2.Click += new EventHandler(bt_Click);
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            this.Controls.Add(bt2);
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            bt3 = new Button();
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            bt3.ID = "Button3";
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            bt3.Text = "*";
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            bt3.CommandArgument = "*";
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            bt3.Click += new EventHandler(bt_Click);
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            this.Controls.Add(bt3);
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            bt4 = new Button();
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            bt4.ID = "Button4";
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            bt4.Text = "/";
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            bt4.CommandArgument = "/";
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            bt4.Click += new EventHandler(bt_Click);
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            this.Controls.Add(bt4);            
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        }
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        void bt_Click(object sender, EventArgs e)
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{
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            try
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{
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                if ("Result: " != lb.Text)
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{
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                    lb.Text = lb.Text + ", ";
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                }
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                switch( ((Button)sender).CommandArgument  )
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{
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                    case "+": lb.Text = lb.Text + Convert.ToString(Convert.ToInt32(this.tb1.Text) + Convert.ToInt32(this.tb2.Text)); break;
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                    case "-": lb.Text = lb.Text + Convert.ToString(Convert.ToInt32(this.tb1.Text) - Convert.ToInt32(this.tb2.Text)); break;
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                    case "*": lb.Text = lb.Text + Convert.ToString(Convert.ToInt32(this.tb1.Text) * Convert.ToInt32(this.tb2.Text)); break;
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                    case "/": lb.Text = lb.Text + Convert.ToString(Convert.ToInt32(this.tb1.Text) / Convert.ToInt32(this.tb2.Text)); break;
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                }
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            }
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            catch
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{
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                lb.Text = "It's is not right format, please input again.";
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            }            
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        }
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        protected override void RenderContents(HtmlTextWriter output)
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{
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            output.Write("a");
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        }
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        protected override void Render(HtmlTextWriter writer)
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{
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            writer.RenderBeginTag(HtmlTextWriterTag.Table);
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            //Operating item 1
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            tb1.RenderControl(writer);
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            //

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            writer.WriteBreak();
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            //Operating symbol
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            writer.WriteEncodedText(" + - * / ");
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            //Operating item2
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            tb2.RenderControl(writer);
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            //Operating symbol
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            writer.WriteEncodedText(" EQUAL ");
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            //The relust label
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            lb.RenderControl(writer);
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            //Button1
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            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Nobr);
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            writer.RenderBeginTag(HtmlTextWriterTag.Td);
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            bt1.RenderControl(writer);                        
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            bt2.RenderControl(writer);            
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            bt3.RenderControl(writer);            
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            bt4.RenderControl(writer);
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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            writer.RenderEndTag();
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        }
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    }
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}
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2. 前台页面代码 UsingCompositeControl.aspx (使用方法)
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UsingCompositeControl.aspx.cs" Inherits="UsingCompositeControl" %>
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<%@ Register Assembly="KingControls" Namespace="KingControls" TagPrefix="KSP" %>
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… …
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… …
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(三). 示例代码下载        http://www.cnblogs.com/Files/ChengKing/KingControls.rar

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