关于参数，集合的演示

using System;
using System.Collections.Generic;
using System.Text;

namespace GrenListDemo
{
    public class GreListComparer<T>
    {
        public static void Compare(List<T> ListA, List<T> ListB, out List<T> AandBList, out List<T> AOnlyList, out List<T> BOnlyList)
        {
            AandBList = new List<T>();
            AOnlyList = new List<T>(ListA);
            BOnlyList = new List<T>(ListB);

            for (int i = 0; i < AOnlyList.Count; i++)
            {
                for (int j = 0; j < BOnlyList.Count; j++)
                {
                    if (AOnlyList[i].Equals(BOnlyList[j]))
                    {
                        AandBList.Add(AOnlyList[i]);
                        AOnlyList.RemoveAt(i--);
                        BOnlyList.RemoveAt(j--);
                        break;
                    }
                }
            }
        }

        public static void Compare2(List<T> ListA, List<T> ListB, ref List<T> AandBList, ref List<T> AOnlyList, ref List<T> BOnlyList)
        {
            AandBList = new List<T>();

            for (int i = 0; i < AOnlyList.Count; i++)
            {
                for (int j = 0; j < BOnlyList.Count; j++)
                {
                    if (AOnlyList[i].Equals(BOnlyList[j]))
                    {
                        AandBList.Add(AOnlyList[i]);
                        AOnlyList.RemoveAt(i--);
                        BOnlyList.RemoveAt(j--);
                        break;
                    }
                }
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            List<int> listA = new List<int>();
            listA.Add(1);
            listA.Add(2);
            listA.Add(3);
            List<int> listB = new List<int>();
            listB.Add(2);
            listB.Add(3);
            listB.Add(4);
            List<int> AORB;
            List<int> Aonly;
            List<int> Bonly;

            GreListComparer<int>.Compare(listA, listB,out AORB,out Aonly,out Bonly);

            Console.WriteLine(AORB.Count.ToString());
            Console.WriteLine(Aonly.Count.ToString());
            Console.WriteLine(Bonly.Count.ToString());


            List<int> listA2 = new List<int>();
            listA2.Add(1);
            listA2.Add(2);
            listA2.Add(3);
            List<int> listB2 = new List<int>();
            listB2.Add(2);
            listB2.Add(3);
            listB2.Add(4);
            List<int> AORB2=new List<int>();
            List<int> Aonly2 = new List<int>(listA2);
            List<int> Bonly2 = new List<int>(listB2);

            GreListComparer<int>.Compare2(listA2, listB2, ref AORB2, ref Aonly2, ref Bonly2);

            Console.WriteLine(AORB2.Count.ToString());
            Console.WriteLine(Aonly2.Count.ToString());
            Console.WriteLine(Bonly2.Count.ToString());

            List<string> listA3 = new List<string>();
            listA3.Add("pp");
            listA3.Add("xy");
            listA3.Add("xyz");
            List<string> listB3 = new List<string>();
            listB3.Add("xyz");
            listB3.Add("hj");
            listB3.Add("ff");
            List<string> AORB3 = new List<string>();
            List<string> Aonly3 = new List<string>(listA3);
            List<string> Bonly3 = new List<string>(listB3);

            GreListComparer<string>.Compare2(listA3, listB3, ref AORB3, ref Aonly3, ref Bonly3);

            Console.WriteLine(AORB3.Count.ToString());
            Console.WriteLine(Aonly3.Count.ToString());
            Console.WriteLine(Bonly3.Count.ToString());


            Console.ReadKey();
        }
    }
}