在程序运行时怎样修改App.config文件的数据库配置节?
日期：2014-05-20 浏览次数：21093 次
在程序运行时怎样修改App.config文件的数据库配置节??????????????????急....在线等
<connectionStrings>
<add name= "conString " connectionString= "Database=newsinco;Server=192.168.0.66;uid=sa;pwd=aaa;Connection Reset=FALSE "
providerName= "System.Data.SqlClient " />
</connectionStrings>
我知道是用下面的那个类，但具体不知道怎么用？求高手帮忙，真的很急，今天下午老大要我搞定，晕,具体怎要显示以前的，和怎样去修改,
Configuration config=ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
------解决方案--------------------
（前台页面代码）
<%@ 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>
（后台CS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 ")
<connectionStrings>
<add name= "conString " connectionString= "Database=newsinco;Server=192.168.0.66;uid=sa;pwd=aaa;Connection Reset=FALSE "
providerName= "System.Data.SqlClient " />
</connectionStrings>
我知道是用下面的那个类，但具体不知道怎么用？求高手帮忙，真的很急，今天下午老大要我搞定，晕,具体怎要显示以前的，和怎样去修改,
Configuration config=ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
------解决方案--------------------
（前台页面代码）
<%@ 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>
（后台CS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 ")
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