Winform窗口容器化单例

public class FormFactory
    {
        static List<Type> types = new List<Type>();
        static List<Form> forms = new List<Form>();

        public static void GetTypes()
        {
            Assembly assembly = Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory +  "Factory.Winform.exe");
            types = assembly.GetTypes().Where(m=>m.BaseType.Name=="Form").ToList();
        }


        public static Form CreateInstance(string formName)
        {
            HideAllForm();
            Form form = forms.Find(m=>m.Name == formName);
            if (form == null)
            {
                Type type = types.Where(t => t.Name == formName).FirstOrDefault();
                form = Activator.CreateInstance(type) as Form;
                forms.Add(form);
            }
            return form;
        }

        private static void HideAllForm()
        {
            forms.ForEach(form => form.Hide());
        }

    }

 public Form1()
        {
            InitializeComponent();
            FormFactory.GetTypes();
        }

        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            string formName = e.Node.Tag.ToString();
            Form form = FormFactory.CreateInstance(formName);
            form.TopLevel = false;
            form.Dock = DockStyle.Fill;
            this.panel1.Controls.Clear();
            this.panel1.Controls.Add(form);
            form.Show();
        }