public void RemoveRow(int index)
 {
     if (index < 0 || index >= DataList.Count)
         throw new IndexOutOfRangeException(string.Format("所提供的的索引超出了行数的范围,当前共{0}行", DataList.Count.ToString()));
     DataList.RemoveAt(index);
     int len = 0;
     if (PositionMapping.ContainsKey(index + 1))
     {
         len = PositionMapping[index + 1] - PositionMapping[index];
         TableBuilder.Remove(PositionMapping[index], len);
         var keys=PositionMapping.Keys.ToList();
         foreach (int i in keys)
         {
             if (PositionMapping.ContainsKey(i + 1))
             {
                 PositionMapping[i] = PositionMapping[i + 1] - len;
             }
         }
         PositionMapping.Remove(DataList.Count);
     }
     else
     {
         len = TableBuilder.Length - PositionMapping[index] - 1;
         TableBuilder.Remove(PositionMapping[index], len);
         PositionMapping.Remove(index);
     }
     if (Index >= DataList.Count)
         Index = DataList.Count - 1;
 }