ConfigurationManager AppSettings - How to modify and save

Question

It might sound too trival to ask and I do the same thing as suggested in articles  yet it doesn t work as expected  Hope someone can point me to the right direction   I would like to save the usersettings per AppSettings   Once the Winform is closed I trigger this   conf Configuration config               ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None    if  ConfigurationManager AppSettings  IntegrateWithPerforce      null      ConfigurationManager AppSettings  IntegrateWithPerforce                                                 e Payload IntegrateCheckBox ToString    else     config AppSettings Settings Add  IntegrateWithPerforce                                              e Payload IntegrateCheckBox ToString      config Save ConfigurationSaveMode Modified     So the first time when the entry doesnt exist yet  it would simply create it  otherwise it would modify the existing entry   However this doesn t save   1  What am I doing wrong   2  Where am I expecting the usersettings for App settings to be saved again  Is it in the Debug folder or in C  Documents and Settings USERNAME Local Settings Application Data folder

User · Answer

as the base question is about win forms here is the solution : ( I just changed the code by user1032413 to rflect windowsForms settings ) if it's a new key :

Configuration config = configurationManager.OpenExeConfiguration(Application.ExecutablePath); 
config.AppSettings.Settings.Add("Key","Value");
config.Save(ConfigurationSaveMode.Modified);

if the key already exists :

Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath); 
config.AppSettings.Settings["Key"].Value="Value";
config.Save(ConfigurationSaveMode.Modified);

User · Answer

Prefer  lt appSettings gt  to  lt customUserSetting gt  section   It is much easier to read AND write with  Web ConfigurationManager   ConfigurationSection  ConfigurationElement and ConfigurationElementCollection require you to derive custom classes and implement custom ConfigurationProperty properties   Way too much for mere everyday mortals IMO   Here is an example of reading and writing to web config   using System Web Configuration  using System Configuration   Configuration config   WebConfigurationManager OpenWebConfiguration       string oldValue   config AppSettings Settings  SomeKey   Value  config AppSettings Settings  SomeKey   Value    NewValue   config Save ConfigurationSaveMode Modified     Before    lt appSettings gt     lt add key  SomeKey  value  oldValue    gt   lt  appSettings gt    After    lt appSettings gt     lt add key  SomeKey  value  newValue    gt   lt  appSettings gt

User · Answer

I think the problem is that in the debug visual studio don t use the normal exeName   it use indtead  NameApplication  host exe  so the name of the config file is   NameApplication  host exe config   and not  NameApplication  exe config  and after the application close - it return to the back app config  so if you check the wrong file  or you check on the wrong time you will see that nothing changed

User · Answer

Perhaps you should look at adding a Settings File   e g  App Settings  Creating this file will allow you to do the following   string mysetting   App Default MySetting  App Default MySetting    my new setting     This means you can edit and then change items  where the items are strongly typed  and best of all    you don t have to touch any xml before you deploy    The result is a Application or User contextual setting   Have a look in the  add new item  menu for the setting file

User · Answer

On how to change values in appSettings section in your app config file   config AppSettings Settings Remove key   config AppSettings Settings Add key  value     does the job   Of course better practice is Settings class but it depends on what are you after

User · Answer

You can change it manually   private void UpdateConfigFile string appConfigPath  string key  string value         var appConfigContent   File ReadAllText appConfigPath        var searchedString      lt add key    key    value           var index   appConfigContent IndexOf searchedString    searchedString Length       var currentValue   appConfigContent Substring index  appConfigContent IndexOf       index  - index        var newContent   appConfigContent Replace    searchedString  currentValue         searchedString  newValue            File WriteAllText appConfigPath  newContent

User · Answer

Remember that ConfigurationManager uses only one app config - one that is in startup project   If you put some app config to a solution A and make a reference to it from another solution B then if you run B  app config from A will be ignored   So for example unit test project should have their own app config

User · Answer

Try adding this after your save call   ConfigurationManager RefreshSection   appSettings

User · Answer

I know I m late    But this how i do it   public static void AddOrUpdateAppSettings 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              For more information look at MSDN

[c#] ConfigurationManager.AppSettings - How to modify and save?

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