Winform—C#读写config配置文件

现在FrameWork2.0以上使用的是：ConfigurationManager或WebConfigurationManager。并且AppSettings属性是只读的，并不支持修改属性值．

一、如何使用ConfigurationManager？

1、添加引用：添加System.configguration

2、引用空间

3、config配置文件配置节

常用配置节：

（1）普通配置节

<appSettings>  

　　<add key="COM1" value="COM1,9600,8,None,1,已启用" />

</appSettings> 

（2）数据源配置节

<connectionStrings>

　　<add name="kyd" connectionString="server=.;database=UFDATA_999_2017;user=sa;pwd=123"/>

</connectionStrings>

（3）自定义配置节

二、config文件读写

1、依据连接串名字connectionName返回数据连接字符串  

//依据连接串名字connectionName返回数据连接字符串  
        public static string GetConnectionStringsConfig(string connectionName)
        {
            //指定config文件读取
            string file = System.Windows.Forms.Application.ExecutablePath;
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            string connectionString =
                config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();
            return connectionString;
        }      

2、更新连接字符串  

///<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> 
        public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
        {
            //指定config文件读取
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
       
</span><span style="color: rgba(0, 0, 255, 1)">bool</span> exist = <span style="color: rgba(0, 0, 255, 1)">false</span>; <span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">记录该连接串是否已经存在  
        </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">如果要更改的连接串已经存在  </span>
        <span style="color: rgba(0, 0, 255, 1)">if</span> (config.ConnectionStrings.ConnectionStrings[newName] != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">)
        {
            exist </span>= <span style="color: rgba(0, 0, 255, 1)">true</span><span style="color: rgba(0, 0, 0, 1)">;
        }
        </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 如果连接串已存在，首先删除它  </span>
        <span style="color: rgba(0, 0, 255, 1)">if</span><span style="color: rgba(0, 0, 0, 1)"> (exist)
        {
            config.ConnectionStrings.ConnectionStrings.Remove(newName);
        }
        </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">新建一个连接字符串实例  </span>
        ConnectionStringSettings mySettings =
            <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> ConnectionStringSettings(newName, newConString, newProviderName);
        </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 将新的连接串添加到配置文件中.  </span>
           
   

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”);

}

3、返回*.exe.config文件中appSettings配置节的value项  

///<summary> 
        ///返回*.exe.config文件中appSettings配置节的value项  
        ///</summary> 
        ///<param name="strKey"></param> 
        ///<returns></returns> 
        public static string GetAppConfig(string strKey)
        {
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == strKey)
                {
                    return config.AppSettings.Settings[strKey].Value.ToString();
                }
            }
            return null;
        }      

4、在*.exe.config文件中appSettings配置节增加一对键值对  

///<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>  
        public static void UpdateAppConfig(string newKey, string newValue)
        {
            string file = System.Windows.Forms.Application.ExecutablePath;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            bool exist = false;
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == newKey)
                {
                    exist = true;
                }
            }
            if (exist)
            {
                config.AppSettings.Settings.Remove(newKey);
            }
            config.AppSettings.Settings.Add(newKey, newValue);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }      

5、修改IP地址

// 修改system.serviceModel下所有服务终结点的IP地址
        public static void UpdateServiceModelConfig(string configPath, string serverIP)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(configPath);
            ConfigurationSectionGroup sec = config.SectionGroups["system.serviceModel"];
            ServiceModelSectionGroup serviceModelSectionGroup = sec as ServiceModelSectionGroup;
            ClientSection clientSection = serviceModelSectionGroup.Client;
            foreach (ChannelEndpointElement item in clientSection.Endpoints)
            {
                string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
                string address = item.Address.ToString();
                string replacement = string.Format("{0}", serverIP);
                address = Regex.Replace(address, pattern, replacement);
                item.Address = new Uri(address);
            }
       
config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">system.serviceModel</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    }

    </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 修改applicationSettings中App.Properties.Settings中服务的IP地址</span>
    <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span> UpdateConfig(<span style="color: rgba(0, 0, 255, 1)">string</span> configPath, <span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)"> serverIP)
    {
        Configuration config </span>=<span style="color: rgba(0, 0, 0, 1)"> ConfigurationManager.OpenExeConfiguration(configPath);
        ConfigurationSectionGroup sec </span>= config.SectionGroups[<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">applicationSettings</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">];
        ConfigurationSection configSection </span>= sec.Sections[<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">DataService.Properties.Settings</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">];
        ClientSettingsSection clientSettingsSection </span>= configSection <span style="color: rgba(0, 0, 255, 1)">as</span><span style="color: rgba(0, 0, 0, 1)"> ClientSettingsSection;
        </span><span style="color: rgba(0, 0, 255, 1)">if</span> (clientSettingsSection != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">)
        {
            SettingElement element1 </span>= clientSettingsSection.Settings.Get(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">DataService_SystemManagerWS_SystemManagerWS</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
            </span><span style="color: rgba(0, 0, 255, 1)">if</span> (element1 != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">)
            {
                clientSettingsSection.Settings.Remove(element1);
                </span><span style="color: rgba(0, 0, 255, 1)">string</span> oldValue =<span style="color: rgba(0, 0, 0, 1)"> element1.Value.ValueXml.InnerXml;
                element1.Value.ValueXml.InnerXml </span>=<span style="color: rgba(0, 0, 0, 1)"> GetNewIP(oldValue, serverIP);
                clientSettingsSection.Settings.Add(element1);
            }

            SettingElement element2 </span>= clientSettingsSection.Settings.Get(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">DataService_EquipManagerWS_EquipManagerWS</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
            </span><span style="color: rgba(0, 0, 255, 1)">if</span> (element2 != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">)
            {
                clientSettingsSection.Settings.Remove(element2);
                </span><span style="color: rgba(0, 0, 255, 1)">string</span> oldValue =<span style="color: rgba(0, 0, 0, 1)"> element2.Value.ValueXml.InnerXml;
                element2.Value.ValueXml.InnerXml </span>=<span style="color: rgba(0, 0, 0, 1)"> GetNewIP(oldValue, serverIP);
                clientSettingsSection.Settings.Add(element2);
            }
        }
        config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">applicationSettings</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    }

    </span><span style="color: rgba(0, 0, 255, 1)">private</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">string</span> GetNewIP(<span style="color: rgba(0, 0, 255, 1)">string</span> oldValue, <span style="color: rgba(0, 0, 255, 1)">string</span><span style="color: rgba(0, 0, 0, 1)"> serverIP)
    {
        </span><span style="color: rgba(0, 0, 255, 1)">string</span> pattern = <span style="color: rgba(128, 0, 0, 1)">@"</span><span style="color: rgba(128, 0, 0, 1)">\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">;
        </span><span style="color: rgba(0, 0, 255, 1)">string</span> replacement = <span style="color: rgba(0, 0, 255, 1)">string</span>.Format(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">{0}</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">, serverIP);
        </span><span style="color: rgba(0, 0, 255, 1)">string</span> newvalue =<span style="color: rgba(0, 0, 0, 1)"> Regex.Replace(oldValue, pattern, replacement);
        </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> newvalue;
    }</span></pre>
           
   

修改IP地址

config 读写方法

using System.Configuration;
//省略其他代码
public SalesOrderData()
        {
            string str = "";
            str = ConfigurationManager.ConnectionStrings["kyd"].ToString();
            conn = new SqlConnection(str);
            cmd = conn.CreateCommand();
        }      

 实际应用：

1、获取配置节的值

button1 点击获取配置节<appSettings>指定key的value值

button2 点击获取配置节<connectionStrings>指定name的connectionString值

结果为：

2、修改配置节的值

button1 点击获取配置节<appSettings>指定key的value值

button2 点击修改配置节<connectionStrings>指定key的value值为文本框的值

button3 点击获取配置节<appSettings>指定key新的value值

结果为：

此时配置文件key1的value值为，获取key值仍为修改前的值

如何重置为修改前的值？

如何保存修改后的值？