1、设置父窗体:
  如果要将某个窗体设置为父窗体,只需将该窗体的IsMdiContainer属性设置为True即可。

  2、设置子窗体:
  通过设为某个窗体的MdiParent属性来确定该窗体是那个窗体的子窗体。
  语法如下:
  1: public Form MdiParent{get;set;}
  3、排列MDI子窗体:
  语法如下:
  1: public void LayoutMdi(MdiLayout value)
  value:是MdiLayout的枚举值之一,用来定义MDI子窗体的布局。

  例程;

1: public partial class FormMain : Form
2:     {
3:         public FormMain()
4:         {
5:             InitializeComponent();
6:         }
7:
8:         private void 加载子窗体ToolStripMenuItem_Click(object sender, EventArgs e)
9:         {
10:             FormChild_1 frm1 = new FormChild_1();
11:             frm1.MdiParent = this;
12:             frm1.Show();
13:
14:             FormChild_2 frm2 = new FormChild_2();
15:             frm2.MdiParent = this;
16:             frm2.Show();
17:
18:             FormChild_3 frm3 = new FormChild_3();
19:             frm3.MdiParent = this;
20:             frm3.Show();
21:         }
22:
23:         private void 水平平铺ToolStripMenuItem_Click(object sender, EventArgs e)
24:         {
25:             LayoutMdi(MdiLayout.TileHorizontal);
26:         }
27:
28:         private void 垂直平铺ToolStripMenuItem_Click(object sender, EventArgs e)
29:         {
30:             LayoutMdi(MdiLayout.TileVertical);
31:         }
32:
33:         private void 层叠排列ToolStripMenuItem_Click(object sender, EventArgs e)
34:         {
35:             LayoutMdi(MdiLayout.Cascade);
36:         }
37:
38:     }