表格加载时c＃控制值问题

像失眠的咖啡，我有另一个问题要发布。在表单的load事件中，我根据作为参数传递到表单构造函数中的类的属性创建和初始化控件。组合框和复选框提前失败（方法“initializeControls（）”）到表单创建但不是更晚（方法“resetData（）”）。我无法理解，因为在事件“SomeForm_Load（sender，e）”中都会调用它们。我做了一些基本的事情，如使用错误的事件？正如我之前的问题帖子所述，我是c＃的新手。任何指导赞赏。我也可以随意告诉我是否也使用过多的反射：D。伪代码，为我的问题的要点：

public class SomeForm : Form
{
  #region fields
  private int _id { get; set; }
  private int _id2 { get; set; }
  #endregion fields
  ...
  public SomeForm()
  {
    InitializeComponent();
  }
  public SomeForm(int id, int id2) : this()
  {
    _id = id;
    _id2 = id2;
  }

  #region init
  private void SomeForm_Load(object sender, EventArgs e)
  {
    method1(); // fails
    method2(); // works
  }
  private void method1()
  {
    var ds = new []{1,2};
    CheckBox cb = new CheckBox();
    cb.DataSource = ds;
    cb.SelectedValue = _id; // <== this is the problem. these two
    this.Controls.Add(cb);  // <== steps should be switched.
  }
  private void method2()
  {
    cb.SelectedValue = _id2;
  }
  ...
}

真正的代码：

public class SomeForm : Form
{
  ...
  #region fields
  ...
  private MultiState.Update _child { get; set; }
  protected object data { get; set; }
  private Type _masterType { get; set; }
  private List<PropertyInfo> _mpks = new List<PropertyInfo>();
  private User _user { get; set; }
  #endregion fields
  ...
  public SomeForm()
  {
    InitializeComponent();
  }
  public SomeForm(User user, Type amaster, object aobject, Dictionary<string, object> astate) : this()
  {
    data = aobject;
    _masterType = amaster;
    dataState = astate;
    _user = user;
  }

  #region init
  private void SomeForm_Load(object sender, EventArgs e)
  {
    initialize();
  }
  private void initialize()
  {
    tsData.Visible = false;
    if (data != null)
    {
      initializeControls(); // FAILS!! without exception
      dataId = DataService.GetPrimaryKeyValue(data);
      resetData(); // SUCCEEDS
    }
  }
  private void initializeControls()
  {
    ...
    ComboBox cb = new ComboBox();
    cb.Enabled = fdEnabled; // correctly read from linq datacontext custom attribute
    cb.FormattingEnabled = true;
    cb.Location = new Point(x, y);
    cb.Name = _CP_COMBOBOX + pi.Name;
    cb.Size = new Size(_WIDTH_CODE, _HEIGHT_SINGLE);
    cb.TabIndex = i;
    cb.TabStop = true;
    cb.Leave += new EventHandler(this.ctlEdit_Leave);

    // set drop-down
    cb.DataSource = domain; // correctly populated from service class
    cb.ValueMember = "Id";
    cb.DisplayMember = "Label";

    // set default
    if (fdDefault != null)
    {

失败后的分配!!所需的值可以正确计算（当取消注释时），但只是忽略它而没有任何异常。

      //object wth = GetDomainKeyAsIdentifierSafe(domain, fdDefault, _user); // correctly parsed
      cb.SelectedValue = GetDomainKeyAsIdentifierSafe(domain, fdDefault, _user); // HUGE FAIL!!
    }
    ...
  }
  #endregion init
  ...
  #region persistence
  ...
  protected string resetData()
  {
    string rc = "";
    if (!isDataNew()) // this form only modal
    {
      //resetDataState();
      #region bind-object-vs-set
      foreach (Control control in this.Controls)
      {
        try
        {
          if (control.Name.StartsWith(_CP_TEXTBOX))
          {
            MethodInfo mi = data.GetType().GetMethod(DataService.LINQ_GET + control.Name.Substring(_CP_TEXTBOX.Length));
            object value = mi.Invoke(data, null);
            control.Text = value == null ? "" : value.ToString();
          }
          else if (control.Name.StartsWith(_CP_CHECKBOX))
          {
            #region bind-object-vs-set-cbx
            bool ck = false;
            string scontrol = control.Name.Substring(_CP_CHECKBOX.Length);
            MethodInfo mi = data.GetType().GetMethod(DataService.LINQ_GET + scontrol);
            object value = mi.Invoke(data, null);
            if (value != null)
            {
              if (value.GetType() == typeof(bool))
              {
                ck = (bool)value;
              }
              else if (value.GetType() == typeof(Nullable<bool>))
              {
                Nullable<bool> nvalue = (Nullable<bool>)value;
                if (nvalue.HasValue)
                  ck = nvalue.Value;
                else
                  ck = AtsService.GetDefaultBoolean(data.GetType(), scontrol);
              }
            }
            CheckBox cbx = (CheckBox)control;
            cbx.Checked = ck;
            #endregion bind-object-vs-set-cbx
          }
          else if (control.Name.StartsWith(_CP_COMBOBOX))
          {
            MethodInfo mi = data.GetType().GetMethod(DataService.LINQ_GET + control.Name.Substring(_CP_COMBOBOX.Length));
            object value = mi.Invoke(data, null);
            ComboBox cb = (ComboBox)control;

下面的作品神秘莫测！

            cb.SelectedValue = value == null ? FormService.NOSELECTION_ID : value; // but this one works!!
          }
        }
      }
    }
  }
  ...
  #endregion persistence
}

编辑：在成功和失败点添加更大的标志。