在Winform中动态读写app.config文件

https://blog.csdn.net/kingmax54212008/article/details/38987277?spm=1001.2101.3001.6650.7&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-7-38987277-blog-82746084.235%5Ev36%5Epc_relevant_default_base3&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-7-38987277-blog-82746084.235%5Ev36%5Epc_relevant_default_base3&utm_relevant_index=12

1、首先需要在项目中引用：System.Configuration

2、通过OpenExeConfiguration（）这个方法来对配置文件进行操作

若当前项目的配置文件如下：

<?xml version="1.0"?>
<configuration>
<appSettings>
<clear />
<add key="DataSource" value=".\SQL2005"/>
<add key="InitialCatalog" value="db"/>
<add key="UserId" value="sa"/>
<add key="Password" value="sa"/>
<add key="ConnectTimeout" value="1000"/>
</appSettings>
<startup>
<supportedRuntime version="v2.0.50727"/>
</startup>
</configuration>

需要对上面appSettings的键值作修改，如下代码所示：

string path = Application.StartupPath + "\\ASSEMLY.exe";
Configuration config = ConfigurationManager.OpenExeConfiguration(path);
config.AppSettings.Settings.Clear();
config.AppSettings.Settings.Add("DataSource", this.DataSource);
config.AppSettings.Settings.Add("InitialCatalog", this.InitialCatalog);
config.AppSettings.Settings.Add("UserId", this.UserId);
config.AppSettings.Settings.Add("Password", this.DePassword);
config.AppSettings.Settings.Add("ConnectTimeout", this.ConnectTimeout.ToString());
// 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("appSettings");

其中它是不能直接修改健值的，是在修改之前要删除该键值，然后重新添加

同是，上面的只是对AppSettings进行操作，其实也可以对ConnectionStrings、SectionGroups、Sections进行操作

读取所有的AppSettings的值

StringBuilder str = new StringBuilder();
str.Append("<table class='isTable'><tr><th></th><th>用户名</th><th>webservices地址</th><th>webservices方法名称</th></tr>");
AppSettingsReader reader =
new AppSettingsReader();

NameValueCollection appStgs =
ConfigurationManager.AppSettings;

string[] names =
ConfigurationManager.AppSettings.AllKeys;

String value = String.Empty;

for (int i = 0; i < appStgs.Count; i++)
{

string key = names[i];
if (key.IndexOf("WebSiteUser") >= 0)
{
value = (String)reader.GetValue(key, value.GetType());
string[] strValue = value.Split(',');
string webservices = strValue[0];
string method = strValue[1];
str.Append("<tr><td><a style='color:White;text-decoration: none;' href=\"/sdmin/EditWebSiteUser?key=" + key + "\"><img src='../../Content/icons/admin_edit.png' alt='' title='编辑'/></a></td><td>" + key.Replace("WebSiteUser", "") + "</td><td>" + webservices + "</td><td>" + method + "</td></tr>");
}

}
str.Append("</table>");
ViewData["ListWebSiteUser"] = str;
return View();

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>

（2）数据源配置节

（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);

            bool exist = 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 (config.ConnectionStrings.ConnectionStrings[newName] != null)
            {
                exist = true;
            }
            // 如果连接串已存在，首先删除它  
            if (exist)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
            }
            //新建一个连接字符串实例  
            ConnectionStringSettings mySettings =
                new ConnectionStringSettings(newName, newConString, newProviderName);
            // 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");
        }

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("system.serviceModel");
        }

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

                SettingElement element2 = clientSettingsSection.Settings.Get("DataService_EquipManagerWS_EquipManagerWS");
                if (element2 != null)
                {
                    clientSettingsSection.Settings.Remove(element2);
                    string oldValue = element2.Value.ValueXml.InnerXml;
                    element2.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP);
                    clientSettingsSection.Settings.Add(element2);
                }
            }
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("applicationSettings");
        }

        private static string GetNewIP(string oldValue, string serverIP)
        {
            string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";
            string replacement = string.Format("{0}", serverIP);
            string newvalue = Regex.Replace(oldValue, pattern, replacement);
            return newvalue;
        }

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