using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;
using System.Runtime.Serialization;
using System.Web.Script.Serialization;
using System.Collections;

namespace ConsoleApplication6
{


    public class C
    {
        public List<A> list;
    }
    public class A:IEqualityComparer<A>
    {
        public string ID;
        public B Data;

        public bool Equals(A x, A y)
        {
            if (x.Data.subjectCode.Equals(y.Data.subjectCode)
                && x.Data.subjectName.Equals(y.Data.subjectName)
                && x.Data.subjectType.Equals(y.Data.subjectType)
                && x.Data.componentFormat.Equals(y.Data.componentFormat))
            {
                return true;
            }
            return false;
        }

        public int GetHashCode(A obj)
        {
            return obj.ToString().GetHashCode();
        }
    }
    public class B
    {
        public string subjectCode;
        public string subjectName;
        public string subjectType;
        public string componentFormat;
    }
    class Program
    {
        static void Main(string[] args)
        {


            string str = "{\"list\":[{\"ID\":1,\"Data\":{\"subjectCode\":\"1\",\"subjectName\":\"1\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}},{\"ID\":2,\"Data\":{\"subjectCode\":\"2\",\"subjectName\":\"2\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}},{\"ID\":4,\"Data\":{\"subjectCode\":\"1\",\"subjectName\":\"1\",\"subjectType\":\"1\",\"componentFormat\":\"2\"}}]}";
            JavaScriptSerializer jsonSerialize = new JavaScriptSerializer();
            C a= jsonSerialize.Deserialize<C>(str);

            List<A> list= a.list;
            var listB = list.Distinct();


            //找到非重复的项
            foreach (var item in listB)
            {
                Console.WriteLine(item.ID);
            }
            
        }
    }
}