(一). 概述 通過制作一個<計算器>功能自定義復合控件演示復合控件的制作 (二). 代碼 1. 核心控件實現代碼文件ComputeControl.cs ??1using?System;
??2using?System.Collections.Generic;
??3using?System.Text;
??4using?System.Web;
??5using?System.Web.UI;
??6using?System.Web.UI.WebControls;
??7
??8namespace?KingControls
??9{
?10????public?class?ComputeControl?:?System.Web.UI.WebControls.CompositeControl
?11????{
?12????????//操作數
?13????????private?TextBox?tb1;
?14????????private?TextBox?tb2;
?15
?16????????//顯示結果
?17????????private?Label?lb;
?18
?19????????//操作(+-*/)
?20????????private?Button?bt1;
?21????????private?Button?bt2;
?22????????private?Button?bt3;
?23????????private?Button?bt4;
?24
?25????????protected?override?void?CreateChildControls()
?26????????{
?27????????????tb1?=?new?TextBox();
?28????????????tb1.ID?=?"TextBox1";
?29????????????this.Controls.Add(?tb1?);
?30????????????
?31????????????tb2?=?new?TextBox();
?32????????????tb2.ID?=?"TextBox2";
?33????????????this.Controls.Add(tb2);
?34????????????
?35????????????lb?=?new?Label();
?36????????????lb.ID?=?"Label1";
?37????????????lb.BackColor?=?System.Drawing.Color.YellowGreen;
?38????????????lb.Text?=?"Result:?";
?39????????????this.Controls.Add(?lb?);
?40????????????
?41????????????bt1?=?new?Button();
?42????????????bt1.ID?=?"Button1";
?43????????????bt1.Text?=?"+";
?44????????????bt1.CommandArgument?=?"+";
?45????????????bt1.Click?+=?new?EventHandler(bt_Click);
?46????????????this.Controls.Add(?bt1?);
?47????????????bt2?=?new?Button();
?48????????????bt2.ID?=?"Button2";
?49????????????bt2.Text?=?"-";
?50????????????bt2.CommandArgument?=?"-";
?51????????????bt2.Click?+=?new?EventHandler(bt_Click);
?52????????????this.Controls.Add(bt2);
?53????????????bt3?=?new?Button();
?54????????????bt3.ID?=?"Button3";
?55????????????bt3.Text?=?"*";
?56????????????bt3.CommandArgument?=?"*";
?57????????????bt3.Click?+=?new?EventHandler(bt_Click);
?58????????????this.Controls.Add(bt3);
?59????????????bt4?=?new?Button();
?60????????????bt4.ID?=?"Button4";
?61????????????bt4.Text?=?"/";
?62????????????bt4.CommandArgument?=?"/";
?63????????????bt4.Click?+=?new?EventHandler(bt_Click);
?64????????????this.Controls.Add(bt4);????????????
?65????????}
?66
?67????????void?bt_Click(object?sender,?EventArgs?e)
?68????????{
?69????????????try
?70????????????{
?71????????????????if?("Result:?"?!=?lb.Text)
?72????????????????{
?73????????????????????lb.Text?=?lb.Text?+?",?";
?74????????????????}
?75????????????????switch(?((Button)sender).CommandArgument??)
?76????????????????{
?77????????????????????case?"+":?lb.Text?=?lb.Text?+?Convert.ToString(Convert.ToInt32(this.tb1.Text)?+?Convert.ToInt32(this.tb2.Text));?break;
?78????????????????????case?"-":?lb.Text?=?lb.Text?+?Convert.ToString(Convert.ToInt32(this.tb1.Text)?-?Convert.ToInt32(this.tb2.Text));?break;
?79????????????????????case?"*":?lb.Text?=?lb.Text?+?Convert.ToString(Convert.ToInt32(this.tb1.Text)?*?Convert.ToInt32(this.tb2.Text));?break;
?80????????????????????case?"/":?lb.Text?=?lb.Text?+?Convert.ToString(Convert.ToInt32(this.tb1.Text)?/?Convert.ToInt32(this.tb2.Text));?break;
?81????????????????}
?82????????????}
?83????????????catch
?84????????????{
?85????????????????lb.Text?=?"It's?is?not?right?format,?please?input?again.";
?86????????????}????????????
?87????????}
?88
?89????????protected?override?void?RenderContents(HtmlTextWriter?output)
?90????????{
?91????????????output.Write("a");
?92
?93????????}
?94
?95????????protected?override?void?Render(HtmlTextWriter?writer)
?96????????{
?97????????????writer.RenderBeginTag(HtmlTextWriterTag.Table);
?98????????????
?99????????????//Operating?item?1
100????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
101????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
102????????????tb1.RenderControl(writer);
103????????????writer.RenderEndTag();
104????????????writer.RenderEndTag();
105????????????
106????????????//<br>
107????????????writer.WriteBreak();
108
109????????????//Operating?symbol
110????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
111????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
112????????????writer.WriteEncodedText("?+?-?*?/?");
113????????????writer.RenderEndTag();
114????????????writer.RenderEndTag();
115
116????????????//Operating?item2
117????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
118????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
119????????????tb2.RenderControl(writer);
120????????????writer.RenderEndTag();
121????????????writer.RenderEndTag();
122
123????????????//Operating?symbol
124????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
125????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
126????????????writer.WriteEncodedText("?EQUAL?");
127????????????writer.RenderEndTag();
128????????????writer.RenderEndTag();
129
130????????????//The?relust?label
131????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
132????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
133????????????lb.RenderControl(writer);
134????????????writer.RenderEndTag();
135????????????writer.RenderEndTag();
136
137????????????//Button1
138????????????writer.RenderBeginTag(HtmlTextWriterTag.Tr);
139????????????writer.RenderBeginTag(HtmlTextWriterTag.Nobr);
140????????????writer.RenderBeginTag(HtmlTextWriterTag.Td);
141????????????bt1.RenderControl(writer);????????????????????????
142????????????bt2.RenderControl(writer);????????????
143????????????bt3.RenderControl(writer);????????????
144????????????bt4.RenderControl(writer);
145????????????writer.RenderEndTag();
146????????????writer.RenderEndTag();
147
148????????????writer.RenderEndTag();
149????????}
150????}
151}
152

2. 前臺頁面代碼 UsingCompositeControl.aspx (使用方法)

1<%@?Page?Language="C#"?AutoEventWireup="true"?CodeFile="UsingCompositeControl.aspx.cs"?Inherits="UsingCompositeControl"?%>
2<%@?Register?Assembly="KingControls"?Namespace="KingControls"?TagPrefix="KSP"?%>
3…?…
4<KSP:ComputeControl?ID="compute1"?runat="server"?/>
5…?…
6

?

(三). 示例代碼下載 ??????? http://files.cnblogs.com/ChengKing/KingControls.rar

轉載于:https://www.cnblogs.com/MVP33650/archive/2007/04/27/730329.html

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