GridView实现自定义按钮及中间插入记录排序功能

        /// <summary>

        /// 增加3个自定义按钮

        /// </summary>

        private void AddCustomButton()

        {

            gcDetail.BeginInit();

            gcDetail.EmbeddedNavigator.Buttons.ImageList = this.imageList1;

            ControlNavigatorButtons btns = gcDetail.EmbeddedNavigator.Buttons;

 

            btns.CustomButtons.Clear();

            NavigatorCustomButton btnDtlAdd = new NavigatorCustomButton((int)DetailButtons.Add,
"新增记录");

            NavigatorCustomButton btnDtlInsert = new NavigatorCustomButton((int)DetailButtons.Insert,
"插入记录");

            NavigatorCustomButton btnDtlDelete = new NavigatorCustomButton((int)DetailButtons.Delete,
"删除记录");

            btns.CustomButtons.AddRange(new NavigatorCustomButton[] { btnDtlAdd, btnDtlInsert,
btnDtlDelete });

 

            gcDetail.EndInit();

        }

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    /// <summary>

    /// 明细表Grid自定义按钮编号(ImageList图片编号，又用作自定义按钮编号，一箭双雕!)

    /// </summary>

    public class DetailButtons

    {

        public const int Add = 0;

        public const int Insert = 1;

        public const int Delete = 2;

    }

/// <summary>
/// 生成排序编号
/// </summary>
public class GenerateSortID
{
   public readonly string DEF_FIRST_SORTING_PRIOR = "0.0";
   public readonly string DEF_SORTING_SEPRATOR = ".";
   public readonly string DEF_FIRST_SORTING = "1";
   public readonly decimal DEF_STEP = (decimal)0.2; //步辐.
   public readonly int DEF_MAX_SORTING_LENGTH = 20;
   
   public GenerateSortID() { }
   
   /// <summary>
   /// 获取指定列的唯一数值.
   /// </summary>
   public ArrayList GetMRUFilters(GridView view, GridColumn col)
   {
      ArrayList list = new ArrayList();
      try
      {
         for (int i = 0; i < view.RowCount; i++)
         {
            object o = view.GetRowCellValue(i, col);
            if (!list.Contains(o) && !o.ToString().Equals(string.Empty)) list.Add(o);
         }
         list.Sort(); //默认为Ascedent
         return list;
      }
      catch
      {
         return list;
      }
   }
   /// <summary>
   /// 获取最大的排序编号
   /// </summary>
   public int GetMaxSortingID(ArrayList sortingFilters)
   {
      try
      {
         sortingFilters.Sort();
         string str = (string)sortingFilters[sortingFilters.Count - 1];
         string[] arr = str.Split(Convert.ToChar(DEF_SORTING_SEPRATOR));
         return Convert.ToInt16(arr[0]);
      }
      catch
      {
         return int.Parse(DEF_FIRST_SORTING);
      }
   }
   
   /// <summary>
   /// 生成一个新的排序编号
   /// </summary>
   /// <param name="currSortingID">当前行的Sort编号</param>
   /// <param name="prevSortingID">前一行的Sort编号</param>
   public string GetNewSortingID(string currSortingID, string prevSortingID)
   {
      try
      {
         if (prevSortingID == null) prevSortingID = DEF_FIRST_SORTING_PRIOR;
         decimal prefix = decimal.Parse(prevSortingID);
         decimal curr = decimal.Parse(currSortingID);
         decimal newid = (curr - prefix) / 2 + prefix;
         string ret = newid.ToString();
         return ret.Replace("5", "4");
      }
      catch
      {
         return currSortingID;
      }
   }
   
   /// <summary>
   /// 生成排序字符串.
   /// Insert方法生成规则,假设当前记录为n:
   /// Append方法生成规则:生成的排序字符串为max(n)+1
   /// </summary>
   public string Generate(GridView view, GridColumn sortingColumn)
   {
      try
      {
         ArrayList list = GetMRUFilters(view, sortingColumn);
         if (view.RowCount <= 0) return DEF_FIRST_SORTING; //设置默认排序ID
         int pos = view.FocusedRowHandle;
         int value = 0;
         if (pos < 0) //没有当前记录. 以Append方式生成排序字符串
         {
            value = GetMaxSortingID(list);
            return value.ToString() + DEF_SORTING_SEPRATOR;
         }
         else if (pos == view.RowCount - 1) // 视为Append.
         {
            string currID = view.GetRowCellValue(pos, sortingColumn).ToString();
            decimal append = decimal.Parse(currID) + DEF_STEP;
            return append.ToString();
         }
         else
         {
            object currobj = view.GetRowCellValue(pos, sortingColumn);

            //Sorting最大长度为20. 如果生成的SortingID大於20.则取当前的SortingID
            if (currobj.ToString().Length >= DEF_MAX_SORTING_LENGTH) return currobj.ToString();
            object preobj = view.GetRowCellValue(pos - 1, sortingColumn);
            if (Convert.ToString(preobj) == "") preobj = (object)0; //如果当前记录是第一条, 那麽上一条记录为0.
            return GetNewSortingID(currobj.ToString(), preobj.ToString());
         }
      }
      catch
      {
         return DEF_FIRST_SORTING;
      }
   }
   
}
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        /// <summary>

        /// 创建一条明细记录。buttonIndex是Append或Insert的按钮编号

        /// </summary>

        /// <param name="buttonIndex"></param>

        private void CreateOneDetail(int buttonIndex)

        {

            //因需要取OrderID,Append狀態下要將光標移到最後一行方可獲取正确OrderID

            if (buttonIndex == DetailButtons.Add) gvDetail.MoveLast();

 

            DataRow row = _dataSource.NewRow();

            row["Qty"] = 0;//set a default value

            if (gvDetail.RowCount == 0) buttonIndex = DetailButtons.Add;

 

            string order = new GenerateSortID().Generate(gvDetail, colOrderField);

            row["OrderField"] = order; //排序字段赋值

 

            if (buttonIndex == DetailButtons.Add)

            {

                _dataSource.Rows.Add(row);

                gcDetail.RefreshDataSource();

                gvDetail.FocusedRowHandle = gvDetail.RowCount - 1;

            }

            else if (buttonIndex == DetailButtons.Insert)

            {

                _dataSource.Rows.InsertAt(row, gvDetail.FocusedRowHandle);

                gvDetail.FocusedRowHandle = gvDetail.FocusedRowHandle - 1;

            }

            gvDetail.FocusedColumn = gvDetail.VisibleColumns[0];

        }

//原创文章，如转载请注明出处。by www.csframework.com C/S框架网

select * from t_product order by OrderField