static void TestConfigUtil()
{
string value1 = ConfigUtil.Settings["key1"];
Console.WriteLine($"key1 = {value1}");
Console.Write($"Please input value: ");
string str = Console.ReadLine();
ConfigUtil util = new ConfigUtil(ConfigType.EXE);
util.AddAppSetting("key1", str);
util.Save();
value1 = util.AppSettings["key1"];
Console.WriteLine($"key1 = {value1}");
value1 = ConfigUtil.Settings["key1"];
Console.WriteLine($"key1 = {value1}");
}