利用程序动态管理Web.config文件的配置

Web.config文件假设有如下需要管理的配置信息:

<appSettings>
<add key="Sitetitle" value="站点名称" />
<add key="SiteUrl" value="主页网址" />
<add key="SiteLogo" value="站点Logo" />
<add key="SiteBanner" value="站点Banner" />
<add key="SiteEmail" value="联系Email" />
</appSettings>

实现的c#核心代码:

一、将Web.config中的相关信息读入TextBox

private void Page_Load(object sender, System.EventArgs e)
{
if(!Page.IsPostBack)
{
//将Web.config中的相关值填入TextBox
this.txttitle.Text=System.Configuration.ConfigurationSettings.AppSettings["Sitetitle"];
this.txtUrl.Text=System.Configuration.ConfigurationSettings.AppSettings["SiteUrl"];
this.txtLogo.Text=System.Configuration.ConfigurationSettings.AppSettings["SiteLogo"];
this.txtBanner.Text=System.Configuration.ConfigurationSettings.AppSettings["SiteBanner"];
this.txtEmail.Text=System.Configuration.ConfigurationSettings.AppSettings["SiteEmail"];
}

}
二、将修改后的内容写入Web.config

private void btnSave_Click(object sender, System.EventArgs e)
{
string filename=Server.MapPath("web.config");
string KeyName;//键名称

XmlDocument xmldoc= new XmlDocument();
try
{
xmldoc.Load(filename);
}
catch
{
Response.Write("<script>alert('读文件时错误,请检查 Web.config 文件是否存在!')</script>");
return;
}

XmlNodeList DocdNodeNameArr=xmldoc.DocumentElement.ChildNodes;//文档节点名称数组
foreach(XmlElement DocXmlElement in DocdNodeNameArr)
{
if(DocXmlElement.Name.ToLower()=="appsettings")//找到名称为 appsettings 的节点
{
XmlNodeList KeyNameArr=DocXmlElement.ChildNodes;//子节点名称数组
if ( KeyNameArr.Count >0 )
{
foreach(XmlElement xmlElement in KeyNameArr)
{
KeyName=xmlElement.Attributes["key"].InnerXml;//键值
switch(KeyName)
{
case "Sitetitle":
xmlElement.Attributes["value"].value=this.txttitle.Text;
break;
case "SiteUrl":
xmlElement.Attributes["value"].value=this.txtUrl.Text;
break;
case "SiteLogo":
xmlElement.Attributes["value"].value=this.txtLogo.Text;
break;
case "SiteBanner":
xmlElement.Attributes["value"].value=this.txtBanner.Text;
break;
case "SiteEmail":
xmlElement.Attributes["value"].value=this.txtEmail.Text;
break;

}
}
}
}
}
try
{
xmldoc.Save(filename);
Response.Write("<script>alert('OK,信息已保存!')</script>");
}
catch
{
Response.Write("<script>alert('写文件时错误,请检查 Web.config 文件是否存在!')</script>");
return;
}

}