1.设置MDI主菜单的MDIWindowListItem=显示子窗口的菜单tsmiWindow, 这样打开的子窗体标题将自动显示在Window菜单下；
2.Window菜单设置两个菜单，一个“下一个窗口”，一个“上一个窗口”，再加一个分隔线， 所以下面的代码从3开始比较。
private void TsmiWindowNext_Click(object sender, EventArgs e)
{
int iItem = tsmiWindow.DropDownItems.Count;
if (iItem>3)
{
int j = 0;
for(int i=3; i<iItem;i++)
{
ToolStripMenuItem stmi = (ToolStripMenuItem)tsmiWindow.DropDownItems[i];
if (stmi.Checked)
{
j=i+1;
stmi.Checked =false;
if (j>=iItem)
{
((ToolStripMenuItem)tsmiWindow.DropDownItems[3]).Checked=true;
getFormbyTitle(tsmiWindow.DropDownItems[3].Text);
return;
}
else
{
((ToolStripMenuItem)tsmiWindow.DropDownItems[j]).Checked=true;
getFormbyTitle(tsmiWindow.DropDownItems[j].Text);
return;
}
}
}
}
}
private void TsmiWindowPre_Click(object sender, EventArgs e)
{
int iItem = tsmiWindow.DropDownItems.Count;
if (iItem>3)
{
int j = 0;
for(int i=3; i<iItem;i++)
{
ToolStripMenuItem stmi = (ToolStripMenuItem)tsmiWindow.DropDownItems[i];
if (stmi.Checked)
{
j=i-1;
stmi.Checked =false;
if (j<3)
{
((ToolStripMenuItem)tsmiWindow.DropDownItems[iItem-1]).Checked=true;
getFormbyTitle(tsmiWindow.DropDownItems[iItem-1].Text);
return;
}
else
{
((ToolStripMenuItem)tsmiWindow.DropDownItems[j]).Checked=true;
getFormbyTitle(tsmiWindow.DropDownItems[j].Text);
return;
}
}
}
}
}
private void getFormbyTitle(String strTitle)
{
foreach(Form f in this.MdiChildren)
{
if (f.Text == strTitle.Substring(strTitle.IndexOf(" ")+1) && f != null)
{
Type formType = f.GetType();
if (formType.IsInstanceOfType(f))
{
if(f.WindowState == FormWindowState.Minimized)
{
f.WindowState = FormWindowState.Normal ;
}
f.BringToFront();
return;
}
}
}
}