C# 修改Web.Config配置文件

using System;using System.Data;using System.Configuration;using System.Collections;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; public partial class _CS_admin_Default_st_sys : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        //调用        ConfigurationOperator cfgOper = new ConfigurationOperator();        cfgOper.SetAppSetting("name", "value");//添加一个节点，如果有就修改        cfgOper.Save();        cfgOper.Dispose();    }    }/// /// ConfigurationOperator 的摘要说明/// public class ConfigurationOperator : IDisposable{    private Configuration config;    public ConfigurationOperator()        : this(HttpContext.Current.Request.ApplicationPath)    {    }    public ConfigurationOperator(string path)    {        config = WebConfigurationManager.OpenWebConfiguration(path);    }    ///     /// 设置应用程序配置节点,如果已经存在此节点,则会修改该节点的值,否则添加此节点    ///     /// 节点名称     /// 节点值     public void SetAppSetting(string key, string value)    {        AppSettingsSection appSetting = (AppSettingsSection)config.GetSection("appSettings");        if (appSetting.Settings[key] == null)//如果不存在此节点,则添加        {            appSetting.Settings.Add(key, value);        }        else//如果存在此节点,则修改        {            appSetting.Settings[key].Value = value;        }    }    ///     /// 设置数据库连接字符串节点,如果不存在此节点,则会添加此节点及对应的值,存在则修改    ///     /// 节点名称     /// 节点值     public void SetConnectionString(string key, string connectionString)    {        ConnectionStringsSection connectionSetting = (ConnectionStringsSection)config.GetSection("connectionStrings");        if (connectionSetting.ConnectionStrings[key] == null)//如果不存在此节点,则添加        {            ConnectionStringSettings connectionStringSettings = new ConnectionStringSettings(key, connectionString);            connectionSetting.ConnectionStrings.Add(connectionStringSettings);        }        else//如果存在此节点,则修改        {            connectionSetting.ConnectionStrings[key].ConnectionString = connectionString;        }    }    ///     /// 保存所作的修改    ///     public void Save()    {        config.Save();        config = null;    }    public void Dispose()    {        if (config != null)        {            config.Save();        }    }}