List.Jion

Posted 2020-09-28 刘顺利

private void simpleButton1_Click(object sender, EventArgs e)
        {
            IList<Channel> list = new List<Channel>();
            Channel item = new Channel();
            item.ID = 1;
            item.ChannelName = "1";
            list.Add(item);

            item = new Channel();
            item.ID = 2;
            item.ChannelName = "2";
            list.Add(item);

            IList<Channel1> list1 = new List<Channel1>();
            Channel1 item1 = new Channel1();
            item1.ID = 1;
            item1.ChannelName1 = "11";
            list1.Add(item1);

            item1 = new Channel1();
            item1.ID = 22;
            item1.ChannelName1 = "22";
            list1.Add(item1);

            var result = from left1 in list
                         join right1 in list1 on left1.ID equals right1.ID into temp
                         select new
                         {
                             ID = left1.ID,
                             ChannelName = left1.ChannelName,
                             ChannelName1 = temp.Select(t => t.ChannelName1).FirstOrDefault()
                         };

            var result1 = list.Join(list1, T1 => T1.ID, T2 => T2.ID, (T1, T2) => new {
                Name = T1.ChannelName,
                ID = T1.ID,
                NickName = T2.ChannelName1
            });

            this.gridControl1.DataSource = result1;
        }
    }
    public class Channel
    {
        private int _ID = 0;
        private string _ChannelName = "";
        /// <summary>
        /// 
        /// </summary>
        public int ID
        {
            set { this._ID = value; }
            get { return this._ID; }
        }
        /// <summary>
        /// 
        /// </summary>
        public string ChannelName
        {
            set { this._ChannelName = value; }
            get { return this._ChannelName; }
        }
        public Channel() { }
        public Channel(int _ID, string _ChannelName)
        {
            this.ID = _ID;
            this.ChannelName = _ChannelName;
        }
    }

    public class Channel1
    {
        private int _ID = 0;
        private string _ChannelName1 = "";
        /// <summary>
        /// 
        /// </summary>
        public int ID
        {
            set { this._ID = value; }
            get { return this._ID; }
        }
        /// <summary>
        /// 
        /// </summary>
        public string ChannelName1
        {
            set { this._ChannelName1 = value; }
            get { return this._ChannelName1; }
        }
        public Channel1() { }
        public Channel1(int _ID, string _ChannelName1)
        {
            this.ID = _ID;
            this.ChannelName1 = _ChannelName1;
        }
    }