WinForm中TextBox事件的组合应用

时间：2010-12-29 来源：hfliyi

功能需求：

用户名不能为空

用户的年龄必须是一个大于或等于0的数字；

用户的地址不能为空

用户的职务必须是“Software”或者为空

这个功能中我们用到了TextChanged，KeyPress，Validating事件；根据功能要求，可知用户名文本框和用户的地址的文本框用到同一个事件EmptyValidating来判断文本框是否为空；

在这个功能用用到空间的tag属性，用此来设置控件的有关数据，我们在构造函数中设置用户名文本框，用户地址文本框，用户年龄文本框，用户职务文本框的tag的值为false。

用到KeyPress事件--在不想要的字符在文本框中显示出来之前就删除它们。

代码

 1 public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6             this.button1.Enabled = false;
 7         }
 8 
 9         private void EmptyValidating(object sender, CancelEventArgs e)
10         {
11             TextBox tb = (TextBox)sender;
12             if (tb.Text.Length == 0)
13             {
14                 tb.BackColor = Color.Red;
15                 tb.Tag = false;
16             }
17             else
18             {
19                 tb.BackColor = SystemColors.Window;
20                 tb.Tag = true;
21             }
22             ValidateOk();
23         }
24         public void ValidateOk()
25         {
26             this.button1.Enabled = (bool)this.txtName.Tag && (bool)this.txtAddress.Tag && (bool)this.txtAge.Tag && (bool)this.txtOccuption.Tag;
27         }
28 
29         private void txtOccuption_Validating(object sender, CancelEventArgs e)
30         {
31             TextBox tb = (TextBox)sender;
32             if (tb.Text.Length == 0 || tb.Text.CompareTo("Software") == 0)
33             {
34                 tb.Tag = true;
35                 tb.BackColor = SystemColors.Window;
36 
37             }
38             else
39             {
40                 tb.Tag = Color.Red;
41                 tb.BackColor = Color.Red;
42             }
43             ValidateOk();
44         }
45 
46         private void txtAge_KeyPress(object sender, KeyPressEventArgs e)
47         {
48             if ((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8)
49             {
50                 e.Handled = true;
51                
52             }
53           
54             
55         }
56 
57         private void txtAge_Validating(object sender, CancelEventArgs e)
58         {
59             TextBox tb = (TextBox)sender;
60             if (tb.Text.Length == 0)
61             {
62                 tb.Tag = false;
63                 tb.BackColor = Color.Red;
64             }
65             else
66             {
67                 tb.Tag = true;
68                 tb.BackColor = SystemColors.Window;
69             }
70             ValidateOk();
71         }
72 
73         private void MessageChanged(object sender, EventArgs e)
74         {
75             TextBox tb = (TextBox)sender;
76             if (tb.Text.Length == 0 && tb.Name != "txtOccuption")
77             {
78                 tb.Tag = false;
79                 tb.BackColor = Color.Red;
80             }
81             else if (tb.Name == "txtOccuption" && (tb.Text.Length != 0 && tb.Text.CompareTo("Software") != 0))
82             {
83                 tb.Tag = false;
84                 //tb.BackColor = Color.Red;
85              }
86             else
87             {
88                 tb.Tag = true;
89                 tb.BackColor = SystemColors.Window;
90             }
91             ValidateOk();
92         }
93 
94         private void button1_Click(object sender, EventArgs e)
95         {
96             this.txtOutput.Text = "";
97             this.txtOutput.Text +="姓名:"+ this.txtName.Text + "\r\n" +"地址:"+ this.txtAddress.Text + "\r\n" +"职务:"+ this.txtOccuption.Text + "\r\n" +"年龄:"+ this.txtAge.Text;
98         }
99     }