ref使用

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TestInterface
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            xx dd = new xx();
            List<int> listInt = new List<int>();
            ITestDemo it = new xx();
            listInt.Add(11);
            it.sss(ref listInt);
            var xx = from a in listInt
                     group a by a % 2 into w
                     select new
                     {
                         aa = 1,
                         bb = w.Key.ToString()
                     };
            var xx1 = from b in listInt
                      let iseven = b % 2 == 0 ? true : false
                      where iseven
                      select b;
            MessageBox.Show(listInt.ToString());
        }
    }
    public interface ITestDemo
    {
        void sss(ref List<int> listInt);
    }
    public class xx : ITestDemo
    {
        public void sss(ref List<int> listInt1)
        {
            List<int> listInt = new List<int>();
            listInt.Add(1);
            listInt.Add(2);
            listInt.Add(3);
            listInt.Add(4);
            listInt.Add(5);
            //listInt.Add("文字");
            //listInt.Add("1111");
            listInt1.AddRange(listInt);
            listInt1[0] = 22;
        }
    }
}

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