动态反射方法的有关问题

动态反射方法的问题
有个问题请教下，
用反射方法调用时，为什么没法初始化当前窗体的控件内容
public class TTWinForm
{
  public static void InvokeChildMethod(string ChildTypeString, string methodName)
  {
  Type type = Type.GetType(ChildTypeString);
  object form = Activator.CreateInstance(type);
  MethodInfo methodInfo = type.GetMethod(methodName);
  methodInfo.Invoke(form, null);
  }
}

TTWinForm.InvokeChildMethod(typeof(TrainDo).ToString(), "LoadForm"); 
被调用的子窗体
 public partial class TrainDo : Form
  {
public void LoadForm()
  {
  button1.Text = "1212";
}
}

[解决办法]
TTWinForm 修改下

C# code

public class TTWinForm{    /// <summary>    /// MDI打开子窗口（只是一个实例）    /// </summary>    /// <param name="MDIForm">父窗口</param>    /// <param name="childType">子窗口类型</param>    /// <returns></returns>    public static Form OpenChildWindow(Form MDIForm, Type childType)    {        Form f = ContainMDIChild(MDIForm, childType);        if (f == null)        {            f = (Form)Activator.CreateInstance(childType);            f.MdiParent = MDIForm;        }        f.Show();        f.Focus();        return f;    }    /// <summary>    /// 查找是否包含子窗口    /// </summary>    /// <param name="MDIForm">父窗口</param>    /// <param name="childType">子窗口类型</param>    /// <returns></returns>    private static Form ContainMDIChild(Form MDIForm, Type childType)    {        foreach (Form f in MDIForm.MdiChildren)        {            if (f.GetType() == childType)            {                f.TopMost = true;                return f;            }        }        return null;    }    public static void InvokeChildMethod(Form f, Type childType, string methodName)    {        MethodInfo methodInfo = childType.GetMethod(methodName, BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic);        methodInfo.Invoke(f, null);    }}