public static void DeleteAppSetting(this System.Configuration.Configuration config, string key)
{
Contract.Requires <ArgumentNullException>(config != null, "config is null.");
Contract.Requires <InvalidOperationException>(config.AppSettings != null, "config does not contain AppSettings.");
Contract.Requires <InvalidOperationException>(!config.IsAppSettingsReadOnly(), "AppSettings is read-only.");
Contract.Requires <InvalidOperationException>(!config.AppSettings.SectionInformation.IsLocked, "AppSettings section is locked.");
Contract.Requires <ArgumentException>(!String.IsNullOrEmpty(key), "key is null or empty.");
config.AppSettings.Settings.Remove(key);
config.Save();
}
public static void WriteAppSetting(this System.Configuration.Configuration config, string key, string value)
{
Contract.Requires <ArgumentNullException>(config != null, "config is null.");
Contract.Requires <InvalidOperationException>(config.AppSettings != null, "config does not contain AppSettings.");
Contract.Requires <InvalidOperationException>(!config.IsAppSettingsReadOnly(), "AppSettings is read-only.");
Contract.Requires <InvalidOperationException>(!config.AppSettings.SectionInformation.IsLocked, "AppSettings section is locked.");
Contract.Requires <ArgumentException>(!String.IsNullOrEmpty(key), "key is null or empty.");
Contract.Requires <ArgumentException>(!String.IsNullOrEmpty(value), "value is null or empty.");
if (config.AppSettings.Settings.AllKeys.Contains(key))
{
config.AppSettings.Settings[key].Value = value;
}
else
{
config.AppSettings.Settings.Add(new KeyValueConfigurationElement(key, value));
}
config.Save();
}
