[C#][SAMPLE][CODE][Control]RadioBox、CheckBox和Validating事件的相关处理

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[示例出处]：本示例来自《C#入门经典》第三版中文版，P349-P353
[示例涉及]：
1、RadioBox、CheckBox控件的基本使用
2、Validating事件的使用(同[C#][SAMPLE][CODE][Control]TextBox和Validating事件的相关处理 )
3、多委托处理同一事件方法(同[C#][SAMPLE][CODE][Control]TextBox和Validating事件的相关处理 )
[示例代码]：2文件(其余默认)

Form1.Designer.cs

namespace WA_TextBoxTest
2

{
3

partial class Form1
4

{
5

/// <summary>
6

/// 必需的设计器变量。
7

/// </summary>
8

private System.ComponentModel.IContainer components = null;
9

/// <summary>
11

/// 清理所有正在使用的资源。
12

/// </summary>
13

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
14

protected override void Dispose(bool disposing)
15

{
16

if (disposing && (components != null))
17

{
18

components.Dispose();
19

}
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base.Dispose(disposing);
21

}
22

Windows 窗体设计器生成的代码
223

224

private System.Windows.Forms.Label label1;
225

private System.Windows.Forms.Label label2;
226

private System.Windows.Forms.TextBox textBoxName;
227

private System.Windows.Forms.TextBox textBoxAddress;
228

private System.Windows.Forms.TextBox textBoxAge;
229

private System.Windows.Forms.TextBox textBoxOutput;
230

private System.Windows.Forms.Label label4;
231

private System.Windows.Forms.Label label5;
232

private System.Windows.Forms.Button buttonOK;
233

private System.Windows.Forms.Button buttonHelp;
234

private System.Windows.Forms.CheckBox checkBoxProgrammer;
235

private System.Windows.Forms.GroupBox groupBoxSex;
236

private System.Windows.Forms.RadioButton radioButtonMale;
237

private System.Windows.Forms.RadioButton radioButtonFemale;
238

}
239

}
240

241

Form1.cs

using System;
2

using System.Collections.Generic;
3

using System.ComponentModel;
4

using System.Data;
5

using System.Drawing;
6

using System.Text;
7

using System.Windows.Forms;
8

namespace WA_TextBoxTest
10

{
11

public partial class Form1 : Form
12

{
13

public Form1()
14

{
15

InitializeComponent();
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this.buttonOK.Enabled = false;
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//Tag values for testing if the data is valid.
19

this.textBoxName.Tag = false;
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this.textBoxAddress.Tag = false;
21

this.textBoxAge.Tag = false;
22

//订阅事件Subscriptions to events
24

this.textBoxName.Validating += new CancelEventHandler(this.textBoxEmpty_Validating);
25

this.textBoxAddress.Validating += new CancelEventHandler(this.textBoxEmpty_Validating);
26

this.textBoxAge.Validating += new CancelEventHandler(this.textBoxEmpty_Validating);
27

//当控件中文本发生改变，就激发TextChanged事件。
29

this.textBoxName.TextChanged +=new EventHandler(textBox_TextChanged);
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this.textBoxAddress.TextChanged+=new EventHandler(textBox_TextChanged);
31

this.textBoxAge.TextChanged += new EventHandler(textBox_TextChanged);
32

}
33

private void buttonOK_Click(object sender, EventArgs e)
35

{
36

//No testing for invalid values are made ,as that should not be necessary
37

string output;
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//Concatenate the text values of for TextBoxes.
40

output = "Name:" + this.textBoxName.Text + "\r\n";
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output += "Address:" + this.textBoxAddress.Text + "\r\n";
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output += "Occupation:" + (string)(this.checkBoxProgrammer.Checked ?
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"Programmer" : "Not a programmer") + "\r\n"; //此句等价于下面这句
44

output += "Occupation:" + (string)(this.checkBoxProgrammer.Checked ?
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this.checkBoxProgrammer.Text : ("Not a "+this.checkBoxProgrammer.Text)) + "\r\n";
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output += "Sex:" + (string)(this.radioButtonFemale.Checked ?
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"Female" : "Male") + "\r\n"; //此句等价于下面这句
48

output += "Sex:" + (string)(this.radioButtonFemale.Checked ?
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this.radioButtonFemale.Text : this.radioButtonMale.Text) + "\r\n";
50

output += "Age:" + this.textBoxAge.Text;
51

//Insert the new text.
53

this.textBoxOutput.Text = output;
54

}
55

private void buttonHelp_Click(object sender, EventArgs e)
57

{
58

//Write a short description of each TextBox in the Output TextBox.
59

string output;
60

output = "Name=Your name\r\n";
62

output += "Address=Your address\r\n";
63

output += "Programmer=Check 'Programmer' if you are a programmer\r\n";
64

output += "Sex=Choose your sex\r\n";
65

output += "Age=Your age";
66

//Insert the new text.
68

this.textBoxOutput.Text = output;
69

}
70

private void textBoxEmpty_Validating(object sender, CancelEventArgs e)
72

{
73

//我们知道这个sender是一个对话框，所以我们将他们强制转换为TextBox
74

TextBox tb = (TextBox)sender;
75

//如果对话框是空的话我们设置TextBox背景色为红色来象征问题。
77

//如果控件有valid信息，我们就使用控件的Tag值来指出。
78

if (tb.Text.Length == 0)
79

{
80

tb.BackColor = Color.Red;
81

tb.Tag = false;
82

//在这个例子中我们不想取消further processing
83

//但是如果我们想要这么做的话，我们只需要添加以下一行：
84

//e.Cancel=true;
85

}
86

else
87

{
88

this.BackColor = SystemColors.Window;
89

tb.Tag = true;
90

}
91

//Finally ,we call ValidateOK which will set the value of the OK button.
92

ValidateOK();
93

}
94

private void textBoxAge_KeyPress(object sender, KeyPressEventArgs e)
96

{
97

if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
98

{
99

e.Handled = true; //Remove the character
100

//等于true告诉用户不应该对字符进行任何操作
101

}
102

}
103

104

private void textBox_TextChanged(object sender, EventArgs e)
105

{
106

//Cast the sender object to a TextBox
107

TextBox tb = (TextBox)sender;
108

109

//Test if the data is valid and set the tag and back ground color accordingly.
110

if (tb.Text.Length == 0)
111

{
112

tb.Tag = false;
113

tb.BackColor = Color.Red;
114

}
115

else
116

{
117

tb.Tag = true;
118

tb.BackColor = SystemColors.Window;
119

}
120

121

//Call ValidateOK to set the OK button
122

ValidateOK();
123

}
124

125

private void ValidateOK()
126

{
127

//Set the OK button to enabled if all the Tags are true
128

this.buttonOK.Enabled = ((bool)(this.textBoxName.Tag) &&
129

(bool)(this.textBoxAge.Tag) &&
130

(bool)(this.textBoxAddress.Tag));
131

}
132

}
133

}

[示例说明]：
1、开发语言：C#
2、开发环境：Visual Studio.Net 2005 Team suite
3、开发模板：C#.net项目->Windows应用程序

posted on 2006-11-27 22:30 volnet（可以叫我大V）阅读(2230) 评论(0) 编辑收藏所属分类: C# Controls

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[C#][SAMPLE][CODE][Control]RadioBox、CheckBox和Validating事件的相关处理