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一、前言在项目中,我们习惯使用 ConfigurationManager 来读取一些常量。如链接数据库字符串、一些需配置的数据(微信、QQ、支付宝)等的配置。我们需要把这些数据记录在 app.config 或者 web.config 中。接下来我们具体看一下 ConfigurationManager : 二、介绍命名空间:System.Configuration 程序集: System.Configuration.dll 引用:在使用中,如果出现“ 当前上下文中不存在名称:ConfigurationManager ”,你就要检查有没有引用程序集和命名空间了。 ConfigurationManager类: 包含属性(AppSettings、ConnectionStrings )、方法(GetSection、OpenExeConfiguration、OpenExeConfiguration、OpenMachineConfiguration、OpenMappedExeConfiguration、OpenMappedExeConfiguration、OpenMappedMachineConfiguration、RefreshSection) 三、使用通过 AppSettings 来获取数据,简单使用案例: using System; using System.Configuration; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { ReadAllSettings(); ReadSetting("Setting1"); ReadSetting("NotValid"); AddUpdateAppSettings("NewSetting", "May 7, 2014"); AddUpdateAppSettings("Setting1", "May 8, 2014"); ReadAllSettings(); } static void ReadAllSettings() { try { var appSettings = ConfigurationManager.AppSettings; if (appSettings.Count == 0) { Console.WriteLine("AppSettings is empty."); } else { foreach (var key in appSettings.AllKeys) { Console.WriteLine("Key: {0} Value: {1}", key, appSettings[key]); } } } catch (ConfigurationErrorsException) { Console.WriteLine("Error reading app settings"); } } static void ReadSetting(string key) { try { var appSettings = ConfigurationManager.AppSettings; string result = appSettings[key] ?? "Not Found"; Console.WriteLine(result); } catch (ConfigurationErrorsException) { Console.WriteLine("Error reading app settings"); } } static void AddUpdateAppSettings(string key, string value) { try { var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); var settings = configFile.AppSettings.Settings; if (settings[key] == null) { settings.Add(key, value); } else { settings[key].Value = value; } configFile.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name); } catch (ConfigurationErrorsException) { Console.WriteLine("Error writing app settings"); } } } } 在文件 App.config 中配置: <?xml version="1.0" encoding="utf-8" ?> <configuration> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" /> </startup> <appSettings> <add key="Setting1" value="May 5,2018"/> <add key="Setting2" value="May 5,2017"/> </appSettings> </configuration> 2、通过使用 ConnectionStrings 来获取数据,使用案例 using System; using System.Configuration; using System.Data.SqlClient; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { ReadUsers(); } static void ReadUsers() { var connectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString; string queryString = "SELECT Id, Name FROM abpusers;"; using (var connection = new SqlConnection(connectionString)) { var command = new SqlCommand(queryString, connection); connection.Open(); using (var reader = command.ExecuteReader()) { while (reader.Read()) { Console.WriteLine(String.Format("{0}, {1}", reader[0], reader[1])); } } } } } } 在 App.config 中配置数据库链接字符串: <?xml version="1.0" encoding="utf-8" ?> <configuration> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" /> </startup> <appSettings> <add key="Setting1" value="May 5,2018"/> <add key="Setting2" value="May 5,2017"/> </appSettings> <connectionStrings> <add name="Default" connectionString="Server=127.0.0.1; Database=CityManage; Trusted_Connection=False; Uid=root; pwd=zxx123456;" providerName="System.Data.SqlClient" /> <add name="Abp.Redis.Cache" connectionString="localhost" /> </connectionStrings> </configuration> 简单小节,资源来源于:官网教程 |
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