VS MDI

1.主窗体 this.IsMdiContainer = true ;
2.

        private void 产品检索ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmProduct Product = new frmProduct();
            bool isOpen = false;
            foreach (Form childrenForm in this.MdiChildren)
            {
                if (childrenForm.Name == Product.Name)
                {
                    Product.Activate();
                    isOpen = true;
                    break;
                }
            }
            if(!isOpen){
                Product.MdiParent = this;
                Product.Show();
            }
            Product.WindowState = FormWindowState.Maximized;
        }

3 层叠  this.LayoutMdi ( MdiLayout.Cascade )
4 水平平铺 this.LayoutMdi ( MdiLayout.TileHorizontal ) ;
5 垂直平铺 this.LayoutMdi ( MdiLayout.TileVertical ) ;