How to update app.config in runtime and then read from it ?

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I've a application in which I want to update app.config. And then read from it. But it's not happening, I'm getting the prior value not the updated value. My code like this :

C#

class Program
    {
	static string str= ConfigurationManager.AppSettings["UserID"];	// it returns "hello"
        static string key = "UserID";
        static string value = NewValue();
        static string exeFileName = "ConsoleApplication.exe";
        static void Main(string[] args)
        {
                 Console.WriteLine(str);		
                 UpdateConfig(key, value, exeFileName);
                str= ConfigurationManager.AppSettings["UserID"];
		Console.WriteLine(str);
		// Doing other stuff
	}
	private static string NewValue()
	{
		return "HelloWorld";
	}
	private static void UpdateConfig(string key, string value, string exeFileName)
        {
            try
            {
                Configuration configFile = ConfigurationManager.OpenExeConfiguration(exeFileName);
                configFile.AppSettings.Settings[key].Value = value;
                configFile.Save();
            }
            catch (Exception ex)
            { 
                throw ex; 
            }
        }
	// Here some others functions
   }

Both time I'm printing "hello" not "HelloWorld".
Please Help me.
Thanks in advance.

Posted 25-Apr-13 16:51pm

Member 9330747

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*Karthik Harve* · Answer 1 · 2013-04-25T18:29:00

Hi,

try like this..

C#

// change the UpdateConfig function like below.
private static void UpdateConfig(string key, string value)
{
    try
    {
        Configuration configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        configFile.AppSettings.Settings[key].Value = value;
        configFile.Save();
    }
    catch (Exception ex)
    { 
        throw ex; 
    }
}

instead of exefilename, try by using ConfigurationUserLevel.None.

refer ConfigurationManager.OpenExeConfiguration Method (String) - MSDN[^]

hope it helps.

Bojjaiah · Answer 2 · 2013-04-25T19:19:00

hi try this,

C#

Key = txtKServerName.Text;
                    Value = txtVServerName.Text;
                   XmlNode appSettingsNode = xmlDoc.SelectSingleNode("configuration/appSettings");
            try
            {
                if (KeyExists(Key))
                {
                    MessageBox.Show("Key name:" + Key + "already exists in the configuration.");
                }
                else
                {
                    XmlNode newChild = appSettingsNode.FirstChild.Clone();
                    newChild.Attributes["key"].Value = Key;
                    newChild.Attributes["value"].Value = Value;
                    appSettingsNode.AppendChild(newChild);
                    xmlDoc.Save(AppDomain.CurrentDomain.BaseDirectory + "..\\..\\App.config");
                    xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
                    MessageBox.Show("Added Successfully ");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

StianSandberg · Answer 3 · 2013-04-25T19:40:00

Solution 3

This code will edit your app.config:

C#

var cfg = ConfigurationManager.OpenExeConfiguration(Assembly.GetExecutingAssembly().Location);
cfg.AppSettings.Settings.Add("test1", "test2");
cfg.Save();

Make sure you check tha correct config file when you look for changes. Not the one in your project, but the one in your bin folder ;)

Posted 25-Apr-13 19:40pm

StianSandberg

Comments

Member 9330747 26-Apr-13 4:22am

should i mention the config file path like ("..\\bin\\Debug\\app.config") ? if yes, how ? please reply.

StianSandberg 26-Apr-13 4:29am

no, it's not necessary. Assembly.GetExecutingAssembly().Location returns the absolute path to your .exe and by using that path, it will find the corresponding .config file.

How to update app.config in runtime and then read from it ?

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