App Config change value

Question

This is my App Config   lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt appSettings gt       lt add key  lang  value  English   gt     lt  appSettings gt   lt  configuration gt    With this code I make the change  lang    Russian   private void Main FormClosing object sender  FormClosingEventArgs e         System Configuration ConfigurationManager AppSettings Set  lang   lang       But it not change  What I m doing wrong

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Thanks Jahmic for the answer  Worked properly for me   another useful code snippet that read the values and return a string   public static string ReadSetting string key                System Configuration Configuration cfg   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None           System Configuration AppSettingsSection appSettings    System Configuration AppSettingsSection cfg GetSection  appSettings            return appSettings Settings key  Value

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That worked for me in WPF application   string configPath   Path Combine System Environment CurrentDirectory   YourApplication exe    Configuration config   ConfigurationManager OpenExeConfiguration configPath   config AppSettings Settings  currentLanguage   Value    En   config Save

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For a  NET 4 0 console application  none of these worked for me   So I modified Kevn Aenmey s answer as below and it worked   private static void UpdateSetting string key  string value        Configuration configuration   ConfigurationManager          OpenExeConfiguration Assembly GetExecutingAssembly   Location       configuration AppSettings Settings key  Value   value      configuration Save         ConfigurationManager RefreshSection  appSettings        Only the first line is different  constructed upon the actual executing assembly

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To update entries other than appsettings  simply use XmlDocument    public static void UpdateAppConfig string tagName  string attributeName  string value        var doc   new XmlDocument        doc Load AppDomain CurrentDomain SetupInformation ConfigurationFile       var tags   doc GetElementsByTagName tagName       foreach  XmlNode item in tags                var attribute   item Attributes attributeName           if   ReferenceEquals null  attribute               attribute Value   value            doc Save AppDomain CurrentDomain SetupInformation ConfigurationFile       This is how you call it    Utility UpdateAppConfig  endpoint    address    http   localhost 19092 NotificationSvc Notification svc     Utility UpdateAppConfig  network    host    abc com au      This method can be improved to cater for appSettings values as well

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AppSettings Set does not persist the changes to your configuration file   It just changes it in memory   If you put a breakpoint on System Configuration ConfigurationManager AppSettings Set  lang   lang    and add a watch for System Configuration ConfigurationManager AppSettings 0  you will see it change from  English  to  Russian  when that line of code runs   The following code  used in a console application  will persist the change   class Program       static void Main string   args                UpdateSetting  lang    Russian               private static void UpdateSetting string key  string value                Configuration configuration   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None           configuration AppSettings Settings key  Value   value          configuration Save             ConfigurationManager RefreshSection  appSettings              From this post  http   vbcity com forums t 152772 aspx     One major point to note with the above is that if you are running this from the debugger  within Visual Studio  then the app config file will be overwritten each time you build  The best way to test this is to build your application and then navigate to the output directory and launch your executable from there  Within the output directory you will also find a file named YourApplicationName exe config which is your configuration file  Open this in Notepad to see that the changes have in fact been saved

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private static string GetSetting string key                return ConfigurationManager AppSettings key              private static void SetSetting string key  string value                Configuration configuration               ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None           configuration AppSettings Settings key  Value   value          configuration Save ConfigurationSaveMode Full  true           ConfigurationManager RefreshSection  appSettings

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when use  ConfigurationUserLevel None  your code is right run when you click in nameyourapp exe in debug folder    but when your do developing app on visual stdio not right run   because  vshost exe  is run   following parameter solve this problem    Application ExecutablePath   try this    Tested in VS 2012 Express For Desktop    Configuration config   ConfigurationManager OpenExeConfiguration Application ExecutablePath   config AppSettings Settings  PortName   Value    com3   config Save ConfigurationSaveMode Minimal     my english not good   i am sorry

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In addition to the answer by fenix2222  which worked for me  I had to modify the last line to    config Save ConfigurationSaveMode Modified     Without this  the new value was still being written to the config file but the old value was retrieved when debugging

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You cannot use AppSettings static object for this  Try this  string appPath   System IO Path GetDirectoryName Reflection Assembly GetExecutingAssembly   Location             string configFile   System IO Path Combine appPath   App config    ExeConfigurationFileMap configFileMap   new ExeConfigurationFileMap             configFileMap ExeConfigFilename   configFile            System Configuration Configuration config   ConfigurationManager OpenMappedExeConfiguration configFileMap  ConfigurationUserLevel None    config AppSettings Settings  YourThing   Value    New Value    config Save

[c#] App.Config change value

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