用构造函数传递窗口。
例如：
//Form1
private void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2(this);
f2.Show();
//this.Hide();
}
//Form2
private Form parent;
public Form2(Form f1)
{
InitializeComponent();
this.parent = f1;
}
//调用Form1的location就是parent.Location
