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

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

[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
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

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原文地址：https://www.cnblogs.com/volnet/p/574437.html