Gridview 增加多个空行。

// 自动填充的行数
   int numCount = 0;
   protected void Page_Load(object sender, EventArgs e)
   {
     if (!Page.IsPostBack)
     {
       GridView1.DataSource = CreateDataSourceByXianhuiMeng();
       GridView1.DataBind();
     }
   }

  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {
     if (e.Row.RowType == DataControlRowType.DataRow)
     {
       // 计算自动填充的行数
       numCount++;
     }
     if (e.Row.RowType == DataControlRowType.Footer)
     {
       // 计算完毕，在此添加缺少的行
       int toLeft = TotalRowCount - numCount;
       int numCols = GridView1.Rows[0].Cells.Count;

      for (int i = 0; i < toLeft; i++)
       {
         GridViewRow row = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);
         for (int j = 0; j < numCols; j++)
         {
           TableCell cell = new TableCell();
           cell.Text = " ";
           row.Cells.Add(cell);
         }
         GridView1.Controls[0].Controls.AddAt(numCount + 1 + i, row);
       }
     }
   }