编辑后未更新Monotouch.dialog EntryElement

Question

我正在使用此代码创建对话框：

SettingsDialog settingDialog = new SettingsDialog ();
RootElement dialog = settingDialog.CreateDialog ();
DialogViewController dv = new DialogViewController (dialog, true);
dv.ViewDissapearing += delegate(object sender1, EventArgs e1) {
  // update the values
  Config.VendorId = settingDialog.VendorId;
} ;
NavigationController.PushViewController (dv, true);

这是SettingsDialogClass的代码

public class SettingsDialog
{
  private EntryElement idElement;
  public RootElement CreateDialog ()
  {
    idElement = new EntryElement ("Vendor Id", string.Empty, Config.VendorId.ToString (CultureInfo.InvariantCulture)){ KeyboardType = UIKeyboardType.NumberPad };

  element = new RootElement ("Configuration"){
  new Section (){
    idElement
   } ,
  ...
}

public string VendorId {
get {
  return idElement.Value;
 }
}

问题是上面的属性ALWAYS返回旧值，它永远不会更新。 知道为什么吗？

感谢， 伊格纳西奥

Answer 1

我找到了问题的答案，这个帖子有关键

How can I pass data into MonoTouch.Dialog's delegates?

这一行： 我可以通过在尝试检索它之前调用field.FetchValue（）来解决它

所以我将属性修改为

public string VendorId {
get {
   idElement.FetchValue();
   return idElement.Value;
 }
}