最彻底的方法是简单地跟踪形式实例的生命周期。订阅的FormClosed事件这样做。例如：

The cleanest way is to simply track the lifetime of the form instance. Do so by subscribing the FormClosed event. For example:

    private UserForm userFormInstance;

    private void showUserForm_Click(object sender, EventArgs e) {
        if (userFormInstance != null) {
            userFormInstance.WindowState = FormWindowState.Normal;
            userFormInstance.Focus();
        }
        else {
            userFormInstance = new UserForm();
            userFormInstance.MdiParent = this;
            userFormInstance.FormClosed += (o, ea) => userFormInstance = null;
            userFormInstance.Show();
        }
    }