asp.net修改web.config

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前台代码

<%@ Page Language="C#" AutoEventWireup="true" Debug="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <table>
    <tr><td>key</td><td><asp:DropDownList ID="ddlst" runat="server" AutoPostBack="true" /></td></tr>
    <tr><td>前</td><td><asp:TextBox ID="txtPre" runat="server" /></td></tr>
    <tr><td>后</td><td><asp:TextBox ID="txtEnd" runat="server" /></td></tr>
    <tr><td colspan="2"><asp:Button ID="btn" runat="server" Text="修改" OnClick="btn_Click" /></td></tr>
    </table>
    </div>
    </form>
</body>
</html>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Configuration;
using System.Xml;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.ddlst.SelectedIndexChanged += new EventHandler(ddlst_SelectedIndexChanged);
        if (!IsPostBack)
        {
            BindList();
            this.txtPre.Text = this.ddlst.SelectedValue;
        }
    }

    private void ddlst_SelectedIndexChanged(object sender, EventArgs e)
    {
       this.txtPre.Text = this.ddlst.SelectedValue;
    }

    private void BindList()
    {
        string strFileName = Server.MapPath(".") + @"Web.config";
        XmlDocument doc = new XmlDocument();
        doc.Load(strFileName);
        XmlNodeList lstTop = doc.DocumentElement.ChildNodes;
        foreach (XmlElement el in lstTop)
        {
            //Response.Write(el.Name + ":top node name:<br />");
            if (el.Name.ToLower() == "appsettings")
            {
                XmlNodeList lstApp = el.ChildNodes;
                if (lstApp.Count > 0)
                {
                    this.ddlst.Items.Clear();
                    foreach (XmlElement elApp in lstApp)
                    {
                       this.ddlst.Items.Add(new ListItem(elApp.Attributes["key"].InnerXml,elApp.Attributes["value"].Value));
                    }
                }
                break;
            }
        }
    }

    public void btn_Click(object sender, EventArgs e)
    {
        //Response.Write("selected value:" + this.ddlst.SelectedValue + "<br />");
        string strFileName = Server.MapPath(".") + @"Web.config";
        XmlDocument doc = new XmlDocument();
        doc.Load(strFileName);
        XmlNodeList lstTop = doc.DocumentElement.ChildNodes;
        foreach (XmlElement el in lstTop)
        {
            if (el.Name.ToLower() == "appsettings")
            {
                XmlNodeList lstApp = el.ChildNodes;
                if (lstApp.Count > 0)
                {
                    foreach (XmlElement elApp in lstApp)
                    {
                       // Response.Write("key name:" + elApp.Attributes["key"].InnerXml + "<br />");
                       // Response.Write("selectedvalue:" + this.ddlst.SelectedValue.ToLower() + "<br />");
                        if (this.ddlst.SelectedItem.Text.ToLower() == elApp.Attributes["key"].InnerXml.ToLower())
                        {
                            //Response.Write("key name:" + elApp.Attributes["key"].InnerXml + "<br />");
                           // Response.Write("value:" + this.txtEnd.Text + "<br />");
                            elApp.Attributes["value"].Value = this.txtEnd.Text;
                        }
                    }
                }
            }
        }
        doc.Save(strFileName);
        BindList();
    }
}