Question

I am developing an application in .NET Framework using C#, in my application I have the necessity of getting a value from an XML file. I have written the following code, to get the value when the key is provided by searching for the key in the XML file.

        XmlDocument appSettingsDoc = new XmlDocument();
        appSettingsDoc.Load(Assembly.GetExecutingAssembly().Location + ".config");
        XmlNode node = appSettingsDoc.SelectSingleNode("//appSettings");
        XmlElement value = (XmlElement)node.SelectSingleNode(string.Format("//add[@key='{0}']", key));
        return (value.GetAttribute("value"));

But I am unable to get the key name when the value is given, for example, if the file contains

                    `<add key="keyname" value="keyvalue" />`

and if I provide “keyvalue” I want to get “keyname”. I know that I am reading from the appconfig file and there is an other way also(i.e using configurationmanager) but I want to read it using XML.
Please help me out.

Thanks,

Bibhu

Answer 1

try using this method

   private static string readConfig(string value)
    {
        System.Configuration.Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(System.Windows.Forms.Application.ExecutablePath);
        System.Configuration.AppSettingsSection ass = config.AppSettings;
        foreach (System.Configuration.KeyValueConfigurationElement item in ass.Settings)
        {
            if (item.Value == value)
                return item.Key;
        }
        return null;
    }