前台代码:
<%
@ Page language
=
"
c#
"
Codebehind
=
"
WebForm1.aspx.cs
"
AutoEventWireup
=
"
false
"
Inherits
=
"
WebApplication1.WebForm1
"
%>
<!
DOCTYPE HTML PUBLIC
"
-//W3C//DTD HTML 4.0 Transitional//EN
"
>
<
HTML
>
<
HEAD
>
<
meta name
=
"
GENERATOR
"
Content
=
"
Microsoft Visual Studio 7.0
"
>
<
meta name
=
"
CODE_LANGUAGE
"
Content
=
"
C#
"
>
<
meta name
=
"
vs_defaultClientScript
"
content
=
"
javascript (ECMAScript)
"
>
<
meta name
=
"
vs_targetSchema
"
content
=
"
http://schemas.microsoft.com/intellisense/ie5
"
;;
>
</
HEAD
>
<
body MS_POSITIONING
=
"
GridLayout
"
>
<
form id
=
"
Form1
"
method
=
"
post
"
runat
=
"
server
"
>
<
FONT face
=
"
宋体
"
>
<
asp:TextBox id
=
"
TextBox1
"
style
=
"
Z-INDEX: 101; LEFT: 164px; POSITION: absolute; TOP: 190px
"
runat
=
"
server
"
Width
=
"
204px
"
Height
=
"
25px
"
></
asp:TextBox
>
<
asp:Button id
=
"
Button1
"
style
=
"
Z-INDEX: 102; LEFT: 386px; POSITION: absolute; TOP: 188px
"
runat
=
"
server
"
Width
=
"
78px
"
Height
=
"
25px
"
Text
=
"
Button
"
></
asp:Button
>
<
asp:DropDownList id
=
"
DropDownList1
"
style
=
"
Z-INDEX: 103; LEFT: 29px; POSITION: absolute; TOP: 192px
"
runat
=
"
server
"
Width
=
"
130px
"
Height
=
"
22px
"
></
asp:DropDownList
>
</
FONT
>
</
form
>
</
body
>
</
HTML
>
CS页代码：
using
System;
using
System.Collections;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Web;
using
System.Web.SessionState;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.Web.UI.HtmlControls;
using
System.Xml
namespace
WebApplication1
{/**//// <summary>/// Summary description for WebForm1./// </summary>public class WebForm1 : System.Web.UI.Page{protected System.Web.UI.WebControls.TextBox TextBox1;protected System.Web.UI.WebControls.DropDownList DropDownList1;protected System.Web.UI.WebControls.Button Button1;public WebForm1(){Page.Init += new System.EventHandler(Page_Init);}private void Page_Load(object sender, System.EventArgs e){if(!Page.IsPostBack){//打开某文件(假设WEB。CONFIG在根目录中)string filename=Server.MapPath("/") + @"\web.config";XmlDocument xmldoc= new XmlDocument();xmldoc.Load(filename);XmlNodeList topM=xmldoc.DocumentElement.ChildNodes;foreach(XmlElement element in topM){if(element.Name.ToLower()=="appsettings"){XmlNodeList _node=element.ChildNodes;if ( _node.Count >0 ){DropDownList1.Items.Clear();foreach(XmlElement el in _node){DropDownList1.Items.Add(el.Attributes["key"].InnerXml);}}}}}}private void Page_Init(object sender, EventArgs e){InitializeComponent();}Web Form Designer generated code#region Web Form Designer generated code/**//// <summary>/// Required method for Designer support - do not modify/// the contents of this method with the code editor./// </summary>private void InitializeComponent(){ this.Button1.Click += new System.EventHandler(this.Button1_Click);this.Load += new System.EventHandler(this.Page_Load);}#endregionprivate void Button1_Click(object sender, System.EventArgs e){string filename=Server.MapPath("/") + @"\web.config";XmlDocument xmldoc= new XmlDocument();xmldoc.Load(filename);XmlNodeList topM=xmldoc.DocumentElement.ChildNodes;foreach(XmlElement element in topM){if(element.Name.ToLower()=="appsettings"){XmlNodeList _node=element.ChildNodes;if ( _node.Count >0 ) {foreach(XmlElement el in _node){if(el.Attributes["key"].InnerXml.ToLower()==this.DropDownList1.SelectedItem.value.ToLower()){el.Attributes["value"].value=this.TextBox1.Text;}}}}}xmldoc.Save(filename);}}}
转载于:https://www.cnblogs.com/lgzdd/archive/2005/08/08/210339.html
