GridView使用XmlDataSource控件来操作Xml数据的更新

前台代码：

    <div style="float:left">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" 
            CellPadding="3" CellSpacing="2" DataSourceID="XmlDataSource1" Height="223px" 
            onrowupdating="GridView1_RowUpdating" Width="561px">
            <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
            <RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
            <Columns>
                <asp:BoundField DataField="title" HeaderText="title" SortExpression="title" />
                <asp:BoundField DataField="img" HeaderText="img" SortExpression="img" />
                <asp:BoundField DataField="url" HeaderText="url" SortExpression="url" />
                <asp:BoundField DataField="target" HeaderText="target" 
                    SortExpression="target" />
                <asp:CommandField ShowSelectButton="True" />
                <asp:CommandField ShowEditButton="True" />
            </Columns>
            <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
        </asp:GridView>
        <asp:XmlDataSource ID="XmlDataSource1" runat="server" 
            DataFile="~/viewerData.xml"></asp:XmlDataSource>
    </div>
    <div style="float:left;">
        &nbsp;&nbsp;&nbsp;<asp:Button ID="btnRefresh" Text="更新" runat="server" 
            onclick="btnRefresh_Click" />
    </div>

后台代码：

public partial class _Default : System.Web.UI.Page 
{
    DataSet ds = new DataSet();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataLoad();
        }
    }
    private void DataLoad()
    {
        GridView1.DataSourceID = "XmlDataSource1";
        GridView1.DataBind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        string strTitle = ((TextBox)GridView1.Rows[e.RowIndex].Cells[0].Controls[0]).Text.ToString();
        string strImgPath = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text.ToString();
        string strUrl = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text.ToString();
        string strTarget = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text.ToString();
        GridViewRow gvr=GridView1.Rows[e.RowIndex];
        string filepath = Server.MapPath("viewerData.xml");
        ds.ReadXml(filepath);
        DataRow dr = ds.Tables[1].Rows[gvr.DataItemIndex];
        dr[0] = strTitle;
        dr[1] = strImgPath;
        dr[2] = strUrl;
        dr[3] = strTarget;
        ds.WriteXml(filepath);
        GridView1.DataSourceID = "XmlDataSource1";
        GridView1.DataBind();
        e.Cancel = true;//表示取消使用GridView的缺省的数据更新操作
        GridView1.EditIndex = -1;//要退出编辑模式，把GridView对象的当前编辑行设成-1
        //GridView会自动设法调用XmlDataSource的update方法（通过IDataSourceConrol/DataSourceView接口），但是XmlDataSource不支持自动更新
    }
    protected void btnRefresh_Click(object sender, EventArgs e)
    {
        DataLoad();
    }
}