C# app.config file

Question

this is my code...

    Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
    AppSettingsSection configSection = config.AppSettings;

    try
    {
        if (configSection != null)
        {
            if (configSection.IsReadOnly() == false && configSection.SectionInformation.IsLocked == false)
            {
                configSection.Settings["DailyFilName"].Value = "NewValue";
                config.Save();
            }
        }
    }
    catch (ConfigurationException ex)
    {
        MessageBox.Show(ex.Message, "Configuration Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }

But its not update my config file :(

We are not compilers to read your code and understand how it will compile/run. Little more explanation would help you and us ;-) — Shoban
– Shoban, Commented Nov 23, 2010 at 10:15
Exception or some more info would be helpful indeed. Wildguess, did you misspell 'DailyFilName'? — Herman Cordes
– Herman Cordes, Commented Nov 23, 2010 at 10:16

Daniel Perez · Accepted Answer · 2010-11-23 10:18:02Z

1

you should use this :

configSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Modified);

take a look at the ConfigurationSaveMode enum for more options

answered Nov 23, 2010 at 10:18

Daniel Perez

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1 Comment

Daniel Perez Over a year ago

also, just noticed the name of the settings is not written correctly "DailyFilName". perhaps a typo here?

Bill the Lizard · Accepted Answer · 2011-03-22 17:00:23Z

1

Here is a solution from the article How to change App.config file run time using C#

 // Open App.Config of executable

 System.Configuration.Configuration config = 
 ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

 // Add an Application Setting.

 config.AppSettings.Settings.Remove("LastDateFeesChecked");

 config.AppSettings.Settings.Add("LastDateFeesChecked",    
 DateTime.Now.ToShortDateString());

 // Save the configuration file.

 config.Save(ConfigurationSaveMode.Modified);

 // Force a reload of a changed section.

ConfigurationManager.RefreshSection("appSettings");

edited Mar 22, 2011 at 17:00

Bill the Lizard

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answered Nov 23, 2010 at 10:20

Singleton

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1 Comment

Pekka Over a year ago

Verbatim unattributed copy from chiragrdarji.wordpress.com/2008/09/25/…

stack72 · Accepted Answer · 2010-11-23 10:18:21Z

0

replace config.Save();

to be

config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");

answered Nov 23, 2010 at 10:18

stack72

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Comments

SubniC · Accepted Answer · 2010-11-23 10:20:35Z

0

I think the problem could be you don't have your configuration parameters as "user-scoped"

answered Nov 23, 2010 at 10:20

SubniC

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