GridView中添加最底层统计数据

<asp:DataGrid id="dgMain1" runat="server" ShowFooter="True" AllowPaging="True" AutoGenerateColumns="False" PageSize="20">
<Columns>
<asp:ButtonColumn Text="详细" HeaderText="详细" CommandName="Select"></asp:ButtonColumn>
<asp:BoundColumn DataField="MID" HeaderText="设备编号"></asp:BoundColumn>
<asp:BoundColumn DataField="RepairCost" HeaderText="维修费用"></asp:BoundColumn>
<asp:BoundColumn DataField="ManHour" HeaderText="工时"></asp:BoundColumn>
<asp:BoundColumn DataField="num" HeaderText="维修次数"></asp:BoundColumn>
</Columns>
<PagerStyle Visible="False"></PagerStyle>
</asp:DataGrid>

private double sum1 = 0;
private double sum2 = 0;

//注意Cells
里的值

private void dgMain1_ItemDataBound(object sender, DataGridItemEventArgs e)
{
if (WebUI.isDataItem(e.Item))
{
e.Item.Cells[0].Attributes.Add("onclick", "setValue1('" + e.Item.Cells[1].Text + "');return false;");//点详细会弹出

//新页面，  setValue1为JS里的函数
}
if (e.Item.ItemIndex >= 0)
{
this.sum1 += double.Parse(WebUI.GetDGCellText(2, -1, e.Item));
this.sum2 += double.Parse(WebUI.GetDGCellText(3, -1, e.Item));
}
else if (e.Item.ItemType == ListItemType.Footer)//添加总统计
{
e.Item.Cells[0].Text = "总统计:";
e.Item.Cells[2].Text = this.sum1.ToString();
e.Item.Cells[3].Text = this.sum2.ToString();
}
}
}

public class WebUI
{

/// <summary>
/// 判断是否是GridView的项
/// </summary>
/// <param name="dgi"></param>
/// <returns></returns>
public static bool isDataItem(DataGridItem dgi)
{
return ((dgi.ItemType == ListItemType.Item) || (dgi.ItemType == ListItemType.AlternatingItem));
}

/// <summary>
/// 返回GridView中单元格的值
/// </summary>
/// <param name="CellIndex">GridView的列</param>
/// <param name="ControlIndex">列中控件的位置，指示第几个控件</param>
/// <param name="dgi"></param>
/// <returns></returns>
public static string GetDGCellText(int CellIndex, int ControlIndex, DataGridItem dgi)
{
if (ControlIndex == -1)
{
return HttpUtility.HtmlDecode(dgi.Cells[CellIndex].Text).Trim();
}
return GetCtrlText(dgi.Cells[CellIndex].Controls[ControlIndex]).Trim();
}

/// <summary>
/// 根据传入的控件，返回控件的值
/// </summary>
/// <param name="Control"></param>
/// <returns></returns>
private static string GetCtrlText(object Control)
{
switch (Control.GetType().ToString())
{
case "System.Web.UI.WebControls.TextBox":
return ((TextBox)Control).Text;

case "System.Web.UI.WebControls.DropDownList":
return ((DropDownList)Control).SelectedValue;

case "System.Web.UI.WebControls.RadioButtonList":
return ((RadioButtonList)Control).SelectedValue;

case "System.Web.UI.WebControls.CheckBox":
return Convert.ToString(((CheckBox)Control).Checked);
}
return null;
}

}