ComboBox中Tag的使用，转换为Enum类型

private ClientMessageObject CreateNewMessage() {
   ClientMessageObject cmsg = new ClientMessageObject();
   RtfFilter filter = new RtfFilter();
   String contentText = filter.ConvertFromDocument(this.rtbContent.Document);
   int[] receiverUserIds = (int[])this.txtRecipient.Tag;
   String recipientName = this.txtRecipient.Text;
   String strReceiverUserIds = WfMessageContent.IntArrayToString(",", receiverUserIds);
   cmsg.Content = this.GetContent(contentText, recipientName, strReceiverUserIds);

//Tag的引用，转换为Enum类型:
   cmsg.Priority =(WfPriority)((ComboBoxItem)this.ucePriority.SelectedItem).Tag;
   cmsg.SentDateTime = DateTime.Now;
   cmsg.Sid = new Guid();
   cmsg.SourceType = MessageSourceTypes.User;
   cmsg.Subject = this.txtSubject.Text;
   cmsg.UnRead = false;
   IUser user = (IUser)this._recipient;
   if (user != null) {
    cmsg.UserId = user.UserID;
    cmsg.UserName = recipientName;
   } else {
    if (this._clientMessage != null) {
     cmsg.UserId = this._clientMessage.UserId;
     cmsg.UserName = this._clientMessage.UserName;
    }
   }
   cmsg.WorkOrderNum = "";

   return cmsg;
  }

private void InitializeUcePriority() {
   Type type = typeof(WfPriority);
   foreach (FieldInfo fieldInfo in type.GetFields(BindingFlags.Static | BindingFlags.Public)) {
    ComboBoxItem item = new ComboBoxItem();
    item.Content = this.GetWfPriorityDisplayTextFromResx(fieldInfo.Name);

//定义Tag
    item.Tag = (Int32)(WfPriority)fieldInfo.GetValue(type);
    this.ucePriority.Items.Add(item);
   }
   this.ucePriority.SelectedIndex = 2;
  }

#region Localization
  private string GetWfPriorityDisplayTextFromResx(String priority) {
   switch (priority.ToLower()) {
    case "highest":
     return BoxPropertyCollectionResx.highest;
    case "high":
     return BoxPropertyCollectionResx.high;
    case "normal":
     return BoxPropertyCollectionResx.normal;
    case "low":
     return BoxPropertyCollectionResx.low;
    case "lowest":
     return BoxPropertyCollectionResx.lowest;
    default:
     return string.Empty;
   }
  }
  #endregion