Winform 随手记

 1         #region 打开唯一窗口
 2         public List<Form> FormList = new List<Form>();
 3 
 4         private void button4_Click(object sender, EventArgs e)
 5         {
 6             Form5 f5 = new Form5(this);
 7 
 8             bool has = false;
 9 
10             foreach (Form f in FormList)
11             {
12                 if (f is Form5)
13                 {
14                     has = true;
15                 }
16             }
17 
18             if (has == false)
19             {
20                 FormList.Add(f5);
21                 f5.Owner = this;
22                 f5.Show();
23             }
24             else
25             {
26 
27             }
28             #endregion

 1         #region 打开唯一窗口
 2         Form1 F1 = null;
 3 
 4         public Form5(Form1 f1)
 5         {
 6             InitializeComponent();
 7             F1 = f1;
 8         }
 9 
10         private void Form5_Load(object sender, EventArgs e)
11         {
12             F1.FormList.Remove(this);
13         }
14         #endregion