DataGridView最后一行不排序(winform)

要用到两个事件，CellMouseClick和Sorted事件，C#代码如下：

        List<object[]> lastRow = new List<object[]>();         int colindex = 0;         private void dgv_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)         {             if (e.RowIndex >= 0 || dgv.Rows.Count == 0)                 return;             if (lastRow.Count == 0)             {                 colindex = e.ColumnIndex;                 int index = dgv.Rows.Count - 1;                 lastRow.Add(((DataTable)dgv.DataSource).Rows[index].ItemArray);                 dgv.Rows.Remove(dgv.Rows[dgv.Rows.Count - 1]);             }         }         private void dgv_Sorted(object sender, EventArgs e)         {             if (lastRow.Count == 0)                 return;             DataTable dt=((DataTable)dgv.DataSource);             DataView dv = dt.DefaultView;  

            dv.Sort = dt.Columns[colindex].ColumnName;  //默认排序为升序,可以自己设定             dt = dv.ToTable ();             dt.Rows.Add(lastRow[0]);             lastRow.Clear();             dgv.DataSource = dt;         }