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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：
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<?xml version="1.0"?>
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<configuration>
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<appSettings>
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<clear />
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<add key="DataSource" value=".SQL2005"/>
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<!-- 数据库服务地址-->
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<add key="InitialCatalog" value="db"/>
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<!-- 数据库名称-->
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<add key="UserId" value="sa"/>
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<!-- 用户名-->
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<add key="Password" value="sa"/>
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<!-- 这个密码是加密之后的-->
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<add key="ConnectTimeout" value="1000"/>
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</appSettings>
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<startup>
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<supportedRuntime version="v2.0.50727"/>
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</startup>
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</configuration>
需要对上面appSettings的键值作修改，如下代码所示：
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string path = Application.StartupPath + "\ASSEMLY.exe";
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Configuration config = ConfigurationManager.OpenExeConfiguration(path);
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config.AppSettings.Settings.Clear();
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config.AppSettings.Settings.Add("DataSource", this.DataSource);
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config.AppSettings.Settings.Add("InitialCatalog", this.InitialCatalog);
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config.AppSettings.Settings.Add("UserId", this.UserId);
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config.AppSettings.Settings.Add("Password", this.DePassword);
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config.AppSettings.Settings.Add("ConnectTimeout", this.ConnectTimeout.ToString());
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// 保存对配置文件所作的更改
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config.Save(ConfigurationSaveMode.Modified);
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// 强制重新载入配置文件的ConnectionStrings配置节
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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();
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); 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 = @"bd{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 = @"bd{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
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？
