父类获取子类属性

 public partial class WebForm1 : System.Web.UI.Page
    {


        protected void Page_Load(object sender, EventArgs e)
        {

            B obj = new B();
            obj.str1 = "a";
            obj.str2 = "b";
            Response.Write(obj.DoSomethine());

        }

    }


    class A
    {
        public string DoSomethine()
        {
            string str = "";
            FieldInfo[] fs=  this.GetType().GetFields();
            foreach (FieldInfo f in fs)
            {
                if (f.GetCustomAttributes(typeof(MyAtt),true).Length > 0)
                {
                    if (f.FieldType == typeof(string))
                    {
                        str += f.GetValue(this).ToString();
                    }
                }
            }
            return str;
        }
    }
    class B:A
    {
        [MyAtt]
        public string str1;
     
        public string str2;
    }
    class MyAtt : Attribute
    {
       
    }