AppConfig读写类

来源：互联网发布：淘宝供货平台编辑：程序博客网时间：2024/06/05 10:23
using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Xml;
namespace WWBClassLib.Tools
{
    class AppConfig
    {
        ///<summary> 
        ///依据连接串名字connectionName返回数据连接字符串 
        ///</summary> 
        ///<param name="connectionName"></param> 
        ///<returns></returns> 
        private static string GetConnectionStringsConfig(string connectionName)
        {
            string connectionString =
                    ConfigurationManager.ConnectionStrings[connectionName].ConnectionString.ToString();
            Console.WriteLine(connectionString);
            return connectionString;
        }
        ///<summary> 
        ///更新连接字符串 
        ///</summary> 
        ///<param name="newName">连接字符串名称</param> 
        ///<param name="newConString">连接字符串内容</param> 
        ///<param name="newProviderName">数据提供程序名称</param> 
        private static void UpdateConnectionStringsConfig(string newName,
            string newConString,
            string newProviderName)
        {
            bool isModified = false;    //记录该连接串是否已经存在 
            //如果要更改的连接串已经存在 
            if (ConfigurationManager.ConnectionStrings[newName] != null)
            {
                isModified = true;
            }
            //新建一个连接字符串实例 
            ConnectionStringSettings mySettings =
                new ConnectionStringSettings(newName, newConString, newProviderName);
            // 打开可执行的配置文件*.exe.config 
            Configuration config =
                ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            // 如果连接串已存在，首先删除它 
            if (isModified)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
            }
            // 将新的连接串添加到配置文件中. 
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            // 保存对配置文件所作的更改 
            config.Save(ConfigurationSaveMode.Modified);
            // 强制重新载入配置文件的ConnectionStrings配置节 
            ConfigurationManager.RefreshSection("ConnectionStrings");
        }
        ///<summary> 
        ///返回＊.exe.config文件中appSettings配置节的value项 
        ///</summary> 
        ///<param name="strKey"></param> 
        ///<returns></returns> 
        private static string GetAppConfig(string strKey)
        {
            foreach (string key in ConfigurationManager.AppSettings)
            {
                if (key == strKey)
                {
                    return ConfigurationManager.AppSettings[strKey];
                }
            }
            return null;
        }
        ///<summary> 
        ///在＊.exe.config文件中appSettings配置节增加一对键、值对 
        ///</summary> 
        ///<param name="newKey"></param> 
        ///<param name="newValue"></param> 
        private static void UpdateAppConfig(string newKey, string newValue)
        {
            bool isModified = false;
            foreach (string key in ConfigurationManager.AppSettings)
            {
                if (key == newKey)
                {
                    isModified = true;
                }
            }
            // Open App.Config of executable 
            Configuration config =
                ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            // You need to remove the old settings object before you can replace it 
            if (isModified)
            {
                config.AppSettings.Settings.Remove(newKey);
            }
            // Add an Application Setting. 
            config.AppSettings.Settings.Add(newKey, newValue);
            // Save the changes in App.config file. 
            config.Save(ConfigurationSaveMode.Modified);
            // Force a reload of a changed section. 
            ConfigurationManager.RefreshSection("appSettings");
        }
        /// <summary> 
        /// 写入Key，Value 到XML文件 
        /// </summary> 
        /// <param name="Key"></param> 
        /// <param name="Value"></param> 
        public static void SaveConfig(string Key, string Value)
        {
            XmlDocument doc = new XmlDocument();
            //获得配置文件的全路径 
            string strFileName = AppDomain.CurrentDomain.BaseDirectory.ToString() + "App.config";
            doc.Load(strFileName);
            //找出名称为“add”的所有元素 
            XmlNodeList nodes = doc.GetElementsByTagName("add");
            for (int i = 0; i < nodes.Count; i++)
            {
                //获得将当前元素的key属性 
                XmlAttribute att = nodes[i].Attributes["key"];
                //根据元素的第一个属性来判断当前的元素是不是目标元素 
                if (att.Value == Key)
                {
                    //对目标元素中的第二个属性赋值 
                    att = nodes[i].Attributes["value"];
                    att.Value = Value;
                    break;
                }
            }
            //保存上面的修改 
            doc.Save(strFileName);
        }
    }
}