//粘贴字段
        private void PasteField()
        {
            try
            {
                FieldListContent content = XmlUtility.StringToObject <FieldListContent>(Clipboard.GetText());

                for (int i = 0; i < content.DataList.Count; i++)
                {
                    NodeField field     = content.DataList[i];
                    string    fieldName = field.FieldName;
                    while (m_NodeClass.ExistFieldName(fieldName))
                    {
                        fieldName += "_New";
                    }

                    field.FieldName = fieldName;
                    m_NodeClass.AddField(field);
                }
                Exec("Refresh");
                MainForm.Instance.ShowInfo("您粘贴了" + content.DataList.Count + "个字段!!!");
            }
            catch (Exception ex)
            {
                MainForm.Instance.ShowInfo("无法进行粘贴,错误信息:" + ex.Message);
                MainForm.Instance.ShowMessage("无法进行粘贴,错误信息:" + ex.Message, "警告");
            }
        }
        //复制字段
        private void CopyField()
        {
            if (listViewFields.SelectedItems.Count > 0)
            {
                FieldListContent content = new FieldListContent();
                foreach (ListViewItem lvItem in listViewFields.SelectedItems)
                {
                    if (lvItem.Tag is NodeField)
                    {
                        content.DataList.Add((NodeField)lvItem.Tag);
                    }
                }

                if (content.DataList.Count > 0)
                {
                    Clipboard.SetText(XmlUtility.ObjectToString(content));
                }

                MainForm.Instance.ShowInfo("您复制了" + content.DataList.Count.ToString() + "个字段!!!");
            }
            else
            {
                MainForm.Instance.ShowInfo("您必须选择至少一个进行复制!!!");
                MainForm.Instance.ShowMessage("您必须选择至少一个进行复制!!!", "警告");
            }
        }