[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
1namespace 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
10 /**//// <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 }
20 base.Dispose(disposing);
21 }
22
23 Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码
24
25 /**//// <summary>
26 /// 设计器支持所需的方法 - 不要
27 /// 使用代码编辑器修改此方法的内容。
28 /// </summary>
29 private void InitializeComponent()
30 {
31 this.label1 = new System.Windows.Forms.Label();
32 this.label2 = new System.Windows.Forms.Label();
33 this.textBoxName = new System.Windows.Forms.TextBox();
34 this.textBoxAddress = new System.Windows.Forms.TextBox();
35 this.textBoxAge = new System.Windows.Forms.TextBox();
36 this.textBoxOutput = new System.Windows.Forms.TextBox();
37 this.label4 = new System.Windows.Forms.Label();
38 this.label5 = new System.Windows.Forms.Label();
39 this.buttonOK = new System.Windows.Forms.Button();
40 this.buttonHelp = new System.Windows.Forms.Button();
41 this.checkBoxProgrammer = new System.Windows.Forms.CheckBox();
42 this.groupBoxSex = new System.Windows.Forms.GroupBox();
43 this.radioButtonMale = new System.Windows.Forms.RadioButton();
44 this.radioButtonFemale = new System.Windows.Forms.RadioButton();
45 this.groupBoxSex.SuspendLayout();
46 this.SuspendLayout();
47 //
48 // label1
49 //
50 this.label1.AutoSize = true;
51 this.label1.Location = new System.Drawing.Point(26, 27);
52 this.label1.Name = "label1";
53 this.label1.Size = new System.Drawing.Size(59, 12);
54 this.label1.TabIndex = 0;
55 this.label1.Text = "labelName";
56 //
57 // label2
58 //
59 this.label2.AutoSize = true;
60 this.label2.Location = new System.Drawing.Point(26, 53);
61 this.label2.Name = "label2";
62 this.label2.Size = new System.Drawing.Size(77, 12);
63 this.label2.TabIndex = 1;
64 this.label2.Text = "labelAddress";
65 //
66 // textBoxName
67 //
68 this.textBoxName.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
69 | System.Windows.Forms.AnchorStyles.Right)));
70 this.textBoxName.Location = new System.Drawing.Point(127, 24);
71 this.textBoxName.Name = "textBoxName";
72 this.textBoxName.Size = new System.Drawing.Size(317, 21);
73 this.textBoxName.TabIndex = 2;
74 //
75 // textBoxAddress
76 //
77 this.textBoxAddress.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
78 | System.Windows.Forms.AnchorStyles.Right)));
79 this.textBoxAddress.Location = new System.Drawing.Point(127, 50);
80 this.textBoxAddress.Multiline = true;
81 this.textBoxAddress.Name = "textBoxAddress";
82 this.textBoxAddress.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
83 this.textBoxAddress.Size = new System.Drawing.Size(317, 102);
84 this.textBoxAddress.TabIndex = 2;
85 //
86 // textBoxAge
87 //
88 this.textBoxAge.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
89 | System.Windows.Forms.AnchorStyles.Right)));
90 this.textBoxAge.Location = new System.Drawing.Point(127, 254);
91 this.textBoxAge.Name = "textBoxAge";
92 this.textBoxAge.Size = new System.Drawing.Size(99, 21);
93 this.textBoxAge.TabIndex = 4;
94 this.textBoxAge.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBoxAge_KeyPress);
95 //
96 // textBoxOutput
97 //
98 this.textBoxOutput.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
99 | System.Windows.Forms.AnchorStyles.Left)
100 | System.Windows.Forms.AnchorStyles.Right)));
101 this.textBoxOutput.Location = new System.Drawing.Point(28, 307);
102 this.textBoxOutput.Multiline = true;
103 this.textBoxOutput.Name = "textBoxOutput";
104 this.textBoxOutput.ReadOnly = true;
105 this.textBoxOutput.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
106 this.textBoxOutput.Size = new System.Drawing.Size(416, 171);
107 this.textBoxOutput.TabIndex = 5;
108 //
109 // label4
110 //
111 this.label4.AutoSize = true;
112 this.label4.Location = new System.Drawing.Point(26, 257);
113 this.label4.Name = "label4";
114 this.label4.Size = new System.Drawing.Size(53, 12);
115 this.label4.TabIndex = 7;
116 this.label4.Text = "labelAge";
117 //
118 // label5
119 //
120 this.label5.AutoSize = true;
121 this.label5.Location = new System.Drawing.Point(26, 289);
122 this.label5.Name = "label5";
123 this.label5.Size = new System.Drawing.Size(71, 12);
124 this.label5.TabIndex = 8;
125 this.label5.Text = "labelOutput";
126 //
127 // buttonOK
128 //
129 this.buttonOK.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
130 this.buttonOK.Location = new System.Drawing.Point(458, 18);
131 this.buttonOK.Name = "buttonOK";
132 this.buttonOK.Size = new System.Drawing.Size(82, 21);
133 this.buttonOK.TabIndex = 9;
134 this.buttonOK.Text = "OK";
135 this.buttonOK.UseVisualStyleBackColor = true;
136 this.buttonOK.Click += new System.EventHandler(this.buttonOK_Click);
137 //
138 // buttonHelp
139 //
140 this.buttonHelp.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
141 this.buttonHelp.CausesValidation = false;
142 this.buttonHelp.Location = new System.Drawing.Point(458, 43);
143 this.buttonHelp.Name = "buttonHelp";
144 this.buttonHelp.Size = new System.Drawing.Size(82, 21);
145 this.buttonHelp.TabIndex = 10;
146 this.buttonHelp.Text = "Help";
147 this.buttonHelp.UseVisualStyleBackColor = true;
148 this.buttonHelp.Click += new System.EventHandler(this.buttonHelp_Click);
149 //
150 // checkBoxProgrammer
151 //
152 this.checkBoxProgrammer.AutoSize = true;
153 this.checkBoxProgrammer.Checked = true;
154 this.checkBoxProgrammer.CheckState = System.Windows.Forms.CheckState.Checked;
155 this.checkBoxProgrammer.Location = new System.Drawing.Point(28, 166);
156 this.checkBoxProgrammer.Name = "checkBoxProgrammer";
157 this.checkBoxProgrammer.Size = new System.Drawing.Size(84, 16);
158 this.checkBoxProgrammer.TabIndex = 11;
159 this.checkBoxProgrammer.Text = "Programmer";
160 this.checkBoxProgrammer.UseVisualStyleBackColor = true;
161 //
162 // groupBoxSex
163 //
164 this.groupBoxSex.Controls.Add(this.radioButtonMale);
165 this.groupBoxSex.Controls.Add(this.radioButtonFemale);
166 this.groupBoxSex.Location = new System.Drawing.Point(28, 188);
167 this.groupBoxSex.Name = "groupBoxSex";
168 this.groupBoxSex.Size = new System.Drawing.Size(415, 55);
169 this.groupBoxSex.TabIndex = 12;
170 this.groupBoxSex.TabStop = false;
171 this.groupBoxSex.Text = "Sex";
172 //
173 // radioButtonMale
174 //
175 this.radioButtonMale.AutoSize = true;
176 this.radioButtonMale.Location = new System.Drawing.Point(235, 24);
177 this.radioButtonMale.Name = "radioButtonMale";
178 this.radioButtonMale.Size = new System.Drawing.Size(113, 16);
179 this.radioButtonMale.TabIndex = 1;
180 this.radioButtonMale.Text = "radioButtonMale";
181 this.radioButtonMale.UseVisualStyleBackColor = true;
182 //
183 // radioButtonFemale
184 //
185 this.radioButtonFemale.AutoSize = true;
186 this.radioButtonFemale.Checked = true;
187 this.radioButtonFemale.Location = new System.Drawing.Point(55, 24);
188 this.radioButtonFemale.Name = "radioButtonFemale";
189 this.radioButtonFemale.Size = new System.Drawing.Size(125, 16);
190 this.radioButtonFemale.TabIndex = 0;
191 this.radioButtonFemale.TabStop = true;
192 this.radioButtonFemale.Text = "radioButtonFemale";
193 this.radioButtonFemale.UseVisualStyleBackColor = true;
194 //
195 // Form1
196 //
197 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
198 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
199 this.ClientSize = new System.Drawing.Size(561, 490);
200 this.Controls.Add(this.groupBoxSex);
201 this.Controls.Add(this.checkBoxProgrammer);
202 this.Controls.Add(this.buttonHelp);
203 this.Controls.Add(this.buttonOK);
204 this.Controls.Add(this.label5);
205 this.Controls.Add(this.label4);
206 this.Controls.Add(this.textBoxOutput);
207 this.Controls.Add(this.textBoxAge);
208 this.Controls.Add(this.textBoxAddress);
209 this.Controls.Add(this.textBoxName);
210 this.Controls.Add(this.label2);
211 this.Controls.Add(this.label1);
212 this.Name = "Form1";
213 this.Text = "Form1";
214 this.Validating += new System.ComponentModel.CancelEventHandler(this.textBoxEmpty_Validating);
215 this.groupBoxSex.ResumeLayout(false);
216 this.groupBoxSex.PerformLayout();
217 this.ResumeLayout(false);
218 this.PerformLayout();
219
220 }
221
222 #endregion
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
1using System;
2using System.Collections.Generic;
3using System.ComponentModel;
4using System.Data;
5using System.Drawing;
6using System.Text;
7using System.Windows.Forms;
8
9namespace WA_TextBoxTest
10{
11 public partial class Form1 : Form
12 {
13 public Form1()
14 {
15 InitializeComponent();
16 this.buttonOK.Enabled = false;
17
18 //Tag values for testing if the data is valid.
19 this.textBoxName.Tag = false;
20 this.textBoxAddress.Tag = false;
21 this.textBoxAge.Tag = false;
22
23 //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
28 //当控件中文本发生改变，就激发TextChanged事件。
29 this.textBoxName.TextChanged +=new EventHandler(textBox_TextChanged);
30 this.textBoxAddress.TextChanged+=new EventHandler(textBox_TextChanged);
31 this.textBoxAge.TextChanged += new EventHandler(textBox_TextChanged);
32 }
33
34 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;
38
39 //Concatenate the text values of for TextBoxes.
40 output = "Name:" + this.textBoxName.Text + "\r\n";
41 output += "Address:" + this.textBoxAddress.Text + "\r\n";
42 output += "Occupation:" + (string)(this.checkBoxProgrammer.Checked ?
43 "Programmer" : "Not a programmer") + "\r\n"; //此句等价于下面这句
44 output += "Occupation:" + (string)(this.checkBoxProgrammer.Checked ?
45 this.checkBoxProgrammer.Text : ("Not a "+this.checkBoxProgrammer.Text)) + "\r\n";
46 output += "Sex:" + (string)(this.radioButtonFemale.Checked ?
47 "Female" : "Male") + "\r\n"; //此句等价于下面这句
48 output += "Sex:" + (string)(this.radioButtonFemale.Checked ?
49 this.radioButtonFemale.Text : this.radioButtonMale.Text) + "\r\n";
50 output += "Age:" + this.textBoxAge.Text;
51
52 //Insert the new text.
53 this.textBoxOutput.Text = output;
54 }
55
56 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
61 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
67 //Insert the new text.
68 this.textBoxOutput.Text = output;
69 }
70
71 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
76 //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
95 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
http://www.cnblogs.com/volnet/archive/2006/11/27/574437.html
