app.config ConfigurationHelper

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

using System;
using System.Configuration;
 
namespace EncryptTool
{
    /// <summary>
    /// 用于XML操作
    /// </summary>
    public class ConfigurationHelper
    {
        //定义一个用于保存静态变量的实例
        private static ConfigurationHelper instance = null;
        //定义一个保证线程同步的标识
        private static readonly object locker = new object();
        //构造函数为私有，使外界不能创建该类的实例
        private ConfigurationHelper() { }
        public static ConfigurationHelper Instance
        {
            get
            {
                if (instance == null)
                {
                    lock (locker)
                    {
                        if (instance == null) instance = new ConfigurationHelper();
                    }
                }
                return instance;
            }
        }
 
        /// <summary>
        /// 读取指定路径下Web.config，指定key的value
        /// </summary>
        /// <param name="filePath">路径</param>
        /// <param name="key">key</param>
        /// <returns></returns>
        public string ReadConfiger(string filePath, string key)
        {
            ExeConfigurationFileMap map = new ExeConfigurationFileMap();
            map.ExeConfigFilename = filePath;
            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
            string value = config.AppSettings.Settings[key].Value;
            return value;
        }
 
        /// <summary>
        /// 保存指定路径下Web.config，指定key的value
        /// </summary>
        /// <param name="filePath">路径</param>
        /// <param name="key">key</param>
        /// <param name="value">value</param>
        /// <returns></returns>
        public string SaveConfiger(string filePath, string key,string value)
        {
            ExeConfigurationFileMap map = new ExeConfigurationFileMap();
            map.ExeConfigFilename = filePath;
            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
            //写入<add>元素的Value
            config.AppSettings.Settings[key].Value = value;
            //一定要记得保存，写不带参数的config.Save()也可以
            config.Save();
            //刷新，否则程序读取的还是之前的值（可能已装入内存）
            ConfigurationManager.RefreshSection("appSettings");
 
            return value;
        }
 
        /// <summary>
        /// 根据key获取value
        /// </summary>
        /// <param name="key">key</param>
        /// <returns></returns>
        public string GetValueByKey(string key)
        {
            try
            {
                return ConfigurationManager.AppSettings[key];
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
 
        /// <summary>
        /// 设置key对应value
        /// </summary>
        /// <param name="key">key</param>
        /// <param name="value">value</param>
        public void SetValueByKey(string key, string value)
        {
            try
            {
                //获取Configuration对象
                Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                //根据Key读取<add>元素的Value
                //string name = config.AppSettings.Settings[key].Value;
                //写入<add>元素的Value
                config.AppSettings.Settings[key].Value = value;
                //增加<add>元素
                //config.AppSettings.Settings.Add("url", "//www.jb51.net");
                //删除<add>元素
                //config.AppSettings.Settings.Remove("name");
                //一定要记得保存，写不带参数的config.Save()也可以
                config.Save();
                //刷新，否则程序读取的还是之前的值（可能已装入内存）
                ConfigurationManager.RefreshSection("appSettings");
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
 
/// 判断appSettings中是否有此项
        /// </summary>
        private static bool AppSettingsKeyExists(string strKey, Configuration config)
        {
            foreach (string str in config.AppSettings.Settings.AllKeys)
            {
                if (str == strKey)
                {
                    return true;
                }
            }
            return false;
        }
 
public static string configPath = AppContext.BaseDirectory + "app.config";
        public static string GetConfig(string section)
        {
            ExeConfigurationFileMap map = new ExeConfigurationFileMap();
            map.ExeConfigFilename = configPath;
 
            var config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
            if (AppSettingsKeyExists(section, config))
            {
                return config.AppSettings.Settings[section].Value;
            }
            else return "";
        }
 
    }
}