winform小练习

 1    private void button1_Click(object sender, EventArgs e)
 2         {
 3             string str = textBox1.Text;
 4             char first = str[0];
 5             string second = str.Substring(1);
 6             textBox1.Text = second + first;
 7         }
 8 
 9         private void button2_Click(object sender, EventArgs e)
10         {
11             string str = textBox1.Text;
12             string first = str.Substring(str.Length-1);
13             string second = str.Substring(0, str.Length - first.Length);
14             textBox1.Text = first + second;
15         }

View Code

 1 namespace WindowsFormsApplication1
 2 {
 3     public partial class Form1 : Form
 4     {
 5         public Form1()
 6         {
 7             InitializeComponent();
 8         }
 9         //private int remeber;
10         //public int Remeber
11         //{
12         //    get;
13         //    set;
14         //}
15         private int remeber = 0;
16         private void button1_Click(object sender, EventArgs e)
17         {
18             string name = this.textBox1.Text;
19             string pwd = this.textBox2.Text;
20             if (name == "admin" && pwd == "888888")
21             {
22                 MessageBox.Show("登录成功");
23             }
24             else
25             {
26                 remeber++;//局部变量每次运行完毕都会销毁，下次再运行，会重新初始化，而类字段，只要对象不销毁，就会一直保持对象的字段值。
27                 if (remeber >= 3)
28                 {
29                     MessageBox.Show("已经超过3次,登录失败。");
30                     Application.Exit();
31                 }
32                 MessageBox.Show("登录失败");
33             }
34         }
35         private void button2_Click(object sender, EventArgs e)
36         {
37             string old = this.textBox3.Text;
38             string newpwd = this.textBox4.Text;
39             string newpwd2 = this.textBox5.Text;
40             if (old == newpwd)
41             {
42                 MessageBox.Show("修改后的密码不能和旧密码相同");
43                 return;
44             }
45             else if (newpwd != newpwd2)
46             {
47                 MessageBox.Show("密码修改不一致");
48                 return;
49             }
50             else
51             {
52                 MessageBox.Show("密码修改成功");
53             }
54         }
55         private void button3_Click(object sender, EventArgs e)
56         {
57             string maxname = "";
58             int maxscore = -1;
59             string[] arrays = textBox6.Lines;
60             foreach (string array in arrays)
61             {
62                 string[] a = array.Split('=');
63                 string name = a[0];
64                 string score = a[1];
65                 int scoretemp = Convert.ToInt32(score);
66                 if (scoretemp > maxscore)
67                 {
68                     maxscore = scoretemp;
69                     maxname = name;
70                 }
71             }
72             MessageBox.Show("第一名" + maxname + ",成绩" + maxscore);
73         }
74     }
75 }

View Code