Question

  public class Settings
    {
        public static readonly string fileName = "config.ini";
        private IConfigSource src
        {
            get
            {
                CreateIfNotExists();
                return new IniConfigSource(fileName);
            }
        }

       public void test1()
        {
            //var src = new IniConfigSource(fileName); ;
            src.Configs["DATA"].Set("baa", "haaaaee");
            src.Save();
        }

       public void test2()
        {
            var src2 = new IniConfigSource(fileName); ;
            src2.Configs["DATA"].Set("baa", "haaaaee");
            src2.Save();
        }

    public Stream CreateIfNotExists()
    {
        if (!File.Exists(fileName))
        {
            Stream file = File.Create(fileName);
            return file;
        }

        return null;
    }
}

why the test2() method works fine and test1() not works?

Answer 1

It doesn’t work because your “src” property creates a new IniConfigSource every single time it’s called. Your “test” is expecting it to be the same one across calls.

Store the result of your IniConfigSource in a private variable, and use that if it’s set.

    private IConfigSource _src;
    private IConfigSource src
    {
        get
        {
            if( _src == null )
                _src = new IniConfigSource(fileName);
            return _src;
        }
    }

I’m not going to get into why CreateIfNotExists is there at all, considering the Stream returned is never used and discarded to the GC.