本文介绍了一个自定义复合控件的实现方法，通过创建一个简单的计算器控件来演示整个过程。该计算器支持基本的算术运算，并展示了如何在ASP.NET Web应用程序中使用自定义控件。
(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;
2
using
System.Collections.Generic;
3
using
System.Text;
4
using
System.Web;
5
using
System.Web.UI;
6
using
System.Web.UI.WebControls;
7
8
namespace
KingControls
9
{
10
publicclassComputeControl:System.Web.UI.WebControls.CompositeControl
11
{
12//操作数
13privateTextBoxtb1;
14privateTextBoxtb2;
15
16//显示结果
17privateLabellb;
18
19//操作(+-*/)
20privateButtonbt1;
21privateButtonbt2;
22privateButtonbt3;
23privateButtonbt4;
24
25protectedoverridevoidCreateChildControls()
26{
27tb1=newTextBox();
28tb1.ID="TextBox1";
29this.Controls.Add(tb1);
30
31tb2=newTextBox();
32tb2.ID="TextBox2";
33this.Controls.Add(tb2);
34
35lb=newLabel();
36lb.ID="Label1";
37lb.BackColor=System.Drawing.Color.YellowGreen;
38lb.Text="Result:";
39this.Controls.Add(lb);
40
41bt1=newButton();
42bt1.ID="Button1";
43bt1.Text="+";
44bt1.CommandArgument="+";
45bt1.Click+=newEventHandler(bt_Click);
46this.Controls.Add(bt1);
47bt2=newButton();
48bt2.ID="Button2";
49bt2.Text="-";
50bt2.CommandArgument="-";
51bt2.Click+=newEventHandler(bt_Click);
52this.Controls.Add(bt2);
53bt3=newButton();
54bt3.ID="Button3";
55bt3.Text="*";
56bt3.CommandArgument="*";
57bt3.Click+=newEventHandler(bt_Click);
58this.Controls.Add(bt3);
59bt4=newButton();
60bt4.ID="Button4";
61bt4.Text="/";
62bt4.CommandArgument="/";
63bt4.Click+=newEventHandler(bt_Click);
64this.Controls.Add(bt4);
65
}
66
67voidbt_Click(objectsender,EventArgse)
68{
69try
70{
71if("Result:"!=lb.Text)
72{
73lb.Text=lb.Text+",";
74}
75switch(((Button)sender).CommandArgument)
76{
77case"+":lb.Text=lb.Text+Convert.ToString(Convert.ToInt32(this.tb1.Text)+Convert.ToInt32(this.tb2.Text));break;
78case"-":lb.Text=lb.Text+Convert.ToString(Convert.ToInt32(this.tb1.Text)-Convert.ToInt32(this.tb2.Text));break;
79case"*":lb.Text=lb.Text+Convert.ToString(Convert.ToInt32(this.tb1.Text)*Convert.ToInt32(this.tb2.Text));break;
80case"/":lb.Text=lb.Text+Convert.ToString(Convert.ToInt32(this.tb1.Text)/Convert.ToInt32(this.tb2.Text));break;
81}
82}
83catch
84{
85lb.Text="It'sisnotrightformat,pleaseinputagain.";
86}
87}
88
89protectedoverridevoidRenderContents(HtmlTextWriteroutput)
90{
91output.Write("a");
92
93}
94
95protectedoverridevoidRender(HtmlTextWriterwriter)
96{
97writer.RenderBeginTag(HtmlTextWriterTag.Table);
98
99//Operatingitem1
100writer.RenderBeginTag(HtmlTextWriterTag.Tr);
101writer.RenderBeginTag(HtmlTextWriterTag.Td);
102tb1.RenderControl(writer);
103writer.RenderEndTag();
104writer.RenderEndTag();
105
106//<br>
107writer.WriteBreak();
108
109//Operatingsymbol
110writer.RenderBeginTag(HtmlTextWriterTag.Tr);
111writer.RenderBeginTag(HtmlTextWriterTag.Td);
112writer.WriteEncodedText("+-*/");
113writer.RenderEndTag();
114writer.RenderEndTag();
115
116//Operatingitem2
117writer.RenderBeginTag(HtmlTextWriterTag.Tr);
118writer.RenderBeginTag(HtmlTextWriterTag.Td);
119tb2.RenderControl(writer);
120writer.RenderEndTag();
121writer.RenderEndTag();
122
123//Operatingsymbol
124writer.RenderBeginTag(HtmlTextWriterTag.Tr);
125writer.RenderBeginTag(HtmlTextWriterTag.Td);
126writer.WriteEncodedText("EQUAL");
127writer.RenderEndTag();
128writer.RenderEndTag();
129
130//Therelustlabel
131writer.RenderBeginTag(HtmlTextWriterTag.Tr);
132writer.RenderBeginTag(HtmlTextWriterTag.Td);
133lb.RenderControl(writer);
134writer.RenderEndTag();
135writer.RenderEndTag();
136
137//Button1
138writer.RenderBeginTag(HtmlTextWriterTag.Tr);
139writer.RenderBeginTag(HtmlTextWriterTag.Nobr);
140writer.RenderBeginTag(HtmlTextWriterTag.Td);
141bt1.RenderControl(writer);
142bt2.RenderControl(writer);
143bt3.RenderControl(writer);
144bt4.RenderControl(writer);
145writer.RenderEndTag();
146writer.RenderEndTag();
147
148writer.RenderEndTag();
149}
150}
151
}
152
using
System;2
using
System.Collections.Generic;3
using
System.Text;4
using
System.Web;5
using
System.Web.UI;6
using
System.Web.UI.WebControls;7
8
namespace
KingControls9
{10
publicclassComputeControl:System.Web.UI.WebControls.CompositeControl11
{12
//操作数13
privateTextBoxtb1;14
privateTextBoxtb2;15
16
//显示结果17
privateLabellb;18
19
//操作(+-*/)20
privateButtonbt1;21
privateButtonbt2;22
privateButtonbt3;23
privateButtonbt4;24
25
protectedoverridevoidCreateChildControls()26
{27
tb1=newTextBox();28
tb1.ID="TextBox1";29
this.Controls.Add(tb1);30
31
tb2=newTextBox();32
tb2.ID="TextBox2";33
this.Controls.Add(tb2);34
35
lb=newLabel();36
lb.ID="Label1";37
lb.BackColor=System.Drawing.Color.YellowGreen;38
lb.Text="Result:";39
this.Controls.Add(lb);40
41
bt1=newButton();42
bt1.ID="Button1";43
bt1.Text="+";44
bt1.CommandArgument="+";45
bt1.Click+=newEventHandler(bt_Click);46
this.Controls.Add(bt1);47
bt2=newButton();48
bt2.ID="Button2";49
bt2.Text="-";50
bt2.CommandArgument="-";51
bt2.Click+=newEventHandler(bt_Click);52
this.Controls.Add(bt2);53
bt3=newButton();54
bt3.ID="Button3";55
bt3.Text="*";56
bt3.CommandArgument="*";57
bt3.Click+=newEventHandler(bt_Click);58
this.Controls.Add(bt3);59
bt4=newButton();60
bt4.ID="Button4";61
bt4.Text="/";62
bt4.CommandArgument="/";63
bt4.Click+=newEventHandler(bt_Click);64
this.Controls.Add(bt4);65
}66
67
voidbt_Click(objectsender,EventArgse)68
{69
try70
{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
catch84
{85
lb.Text="It'sisnotrightformat,pleaseinputagain.";86
}87
}88
89
protectedoverridevoidRenderContents(HtmlTextWriteroutput)90
{91
output.Write("a");92
93
}94
95
protectedoverridevoidRender(HtmlTextWriterwriter)96
{97
writer.RenderBeginTag(HtmlTextWriterTag.Table);98
99
//Operatingitem1100
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
//Operatingsymbol110
writer.RenderBeginTag(HtmlTextWriterTag.Tr);111
writer.RenderBeginTag(HtmlTextWriterTag.Td);112
writer.WriteEncodedText("+-*/");113
writer.RenderEndTag();114
writer.RenderEndTag();115
116
//Operatingitem2117
writer.RenderBeginTag(HtmlTextWriterTag.Tr);118
writer.RenderBeginTag(HtmlTextWriterTag.Td);119
tb2.RenderControl(writer);120
writer.RenderEndTag();121
writer.RenderEndTag();122
123
//Operatingsymbol124
writer.RenderBeginTag(HtmlTextWriterTag.Tr);125
writer.RenderBeginTag(HtmlTextWriterTag.Td);126
writer.WriteEncodedText("EQUAL");127
writer.RenderEndTag();128
writer.RenderEndTag();129
130
//Therelustlabel131
writer.RenderBeginTag(HtmlTextWriterTag.Tr);132
writer.RenderBeginTag(HtmlTextWriterTag.Td);133
lb.RenderControl(writer);134
writer.RenderEndTag();135
writer.RenderEndTag();136
137
//Button1138
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. 前台页面代码 UsingCompositeControl.aspx (使用方法)
1
<%
@PageLanguage
=
"
C#
"
AutoEventWireup
=
"
true
"
CodeFile
=
"
UsingCompositeControl.aspx.cs
"
Inherits
=
"
UsingCompositeControl
"
%>
2
<%
@RegisterAssembly
=
"
KingControls
"
Namespace
=
"
KingControls
"
TagPrefix
=
"
KSP
"
%>
3……
4
<
KSP:ComputeControlID
=
"
compute1
"
runat
=
"
server
"
/>
5……
6
<%
@PageLanguage
=
"
C#
"
AutoEventWireup
=
"
true
"
CodeFile
=
"
UsingCompositeControl.aspx.cs
"
Inherits
=
"
UsingCompositeControl
"
%>
2
<%
@RegisterAssembly
=
"
KingControls
"
Namespace
=
"
KingControls
"
TagPrefix
=
"
KSP
"
%>
3
……4
<
KSP:ComputeControlID
=
"
compute1
"
runat
=
"
server
"
/>
5
……6
(三). 示例代码下载
扫一扫
178
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
