using System;

using System.Linq;

using System.Reflection;

​

public class Program

{

    public static void Main()

    {

        TestObject test = new TestObject();

        Console.WriteLine(test.testfld1.GetFieldAttr().Text);

        Console.WriteLine(test.testfld2.GetFieldAttr().Text);

        Console.WriteLine(test.testfld3.GetFieldAttr().Text);

    }

}

public static class Extensions

{

    public static FieldAttr GetFieldAttr(this object source)

    {

        var test = typeof (TestObject);

​

        var type = test.GetFields()

            .FirstOrDefault(x => x.FieldType == source.GetType());

​

        if (type != null)

        {

            var attribute = type.GetCustomAttribute<FieldAttr>();

​

            return attribute;

        }

​

        return null;

    }

}

​

​

public class TestObject

    {

        // Declare fields

        [FieldAttr("prop_testfld1")]

        public FLDtype1 testfld1 = new FLDtype1();

​

        [FieldAttr("prop_testfld2")]

        public FLDtype2 testfld2 = new FLDtype2();

​

        [FieldAttr("prop_testfld3")]

        public FLDtype1 testfld3 = new FLDtype1();

    }

public class FLDtype1

    {

        public string Value { get; set; }

    }

​

    public class FLDtype2

    {

        public Guid Value { get; set; }

    }

​

    public sealed class FieldAttr : System.Attribute

    {

        private string _txt;

​

        public FieldAttr(string txt)

        {

            this._txt = txt;

        }

​

        public string Text { get { return this._txt; } }

    }