【2017-05-03】winform打印控件、事件对象和事件数据、MDI窗体容器

1  List<Form> FormList = new List<Form>();
 2 
 3         private void 销售模块ToolStripMenuItem_Click(object sender, EventArgs e)
 4         {
 5             bool has = false;
 6             Form2 f2 = new Form2();
 7 
 8             //遍历FormList这个集合
 9             foreach (Form f in FormList)
10             {
11                 //如果f是Form2类
12                 if (f is Form2)
13                 {
14                     has = true;
15                     //f2就是Form2
16                     f2 = f as Form2;
17                 }
18             }
19             //如果这个集合中不存在Form2类
20             if (has == false)
21             {
22                 //f2这个窗口属于哪个容器=this
23                 f2.MdiParent = this;
24                 //f2窗口打开初始大小为最大化
25                 f2.WindowState = FormWindowState.Maximized;
26                 //f2窗口的父级是Panel1
27                 f2.Parent = panel1;
28                 //打开f2这个窗口
29                 f2.Show();
30                 //并将f2添加到集合中去
31                 FormList.Add(f2);
32             }
33             //如果已经打开过f2窗口
34             else
35             {
36                 //遍历集合中所有窗体
37                 foreach (Form f in FormList)
38                 {
39                     //全部隐藏
40                     f.Hide();
41                 }
42                 //将f2显示出来
43                 f2.Show();
44             }
45         }