app.config
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Configuration; namespace SettingExample { public partial class Form1 : Form { string g_setting1, g_setting2, g_setting3 = ""; public Form1() { InitializeComponent(); Setting(); MessageBox.Show("Setting1: "+g_setting1+"\nSetting2: "+g_setting2+"\nSetting3: "+g_setting3); } void Setting() { System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); if (config.AppSettings.Settings["Setting1"] == null) { config.AppSettings.Settings.Add("Setting1", "default1"); } if (config.AppSettings.Settings["Setting2"] == null) { config.AppSettings.Settings.Add("Setting2", "default2"); } if (config.AppSettings.Settings["Setting3"] == null) { config.AppSettings.Settings.Add("Setting3", "default3"); } config.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection("appSettings"); g_setting1 = config.AppSettings.Settings["Setting1"].Value; g_setting2 = config.AppSettings.Settings["Setting2"].Value; g_setting3 = config.AppSettings.Settings["Setting3"].Value; } } }
App.config
<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> </configSections> <startup> <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /> </startup> <appSettings> <add key="Setting1" value="default1" /> <add key="Setting2" value="default2" /> <add key="Setting3" value="default3" /> </appSettings> </configuration>