private void btnFormMax_Click(object sender, EventArgs e)

{

if (this.WindowState == FormWindowState.Maximized)

{

this.WindowState = FormWindowState.Normal;

}

else

{

this.WindowState = FormWindowState.Maximized;

}

}

窗体最大化时 非全屏 不会遮盖任务栏

此时this.FormBorderStyle 默认为 Sizable