Question

我在下面有一个示例列表。在我的主要内容中，我希望能够遍历queryResult并基于TotalNumberOfUsersInGrp值，打印第一组中前5个用户的名称，然后打印另一组中的下5个用户的名称。

我无法继续，因为您只能将foreach与集合一起使用。

我该怎么办？

        public class PlayerInformation
            {
                public string fullName { get; set; }
                public string rating { get; set; }     
            }

            class Program
            {
                static void Main(string[] args)
                {
                    Int32  TotalNumberOfUsersInGrp = 5;     
                    List<PlayerInformation> objGetPlayerInfor =  RankPlayers();
                    var queryResult = objGetPlayerInfor.OrderByDescending(q => q.rating);     

                    foreach (var item in queryResult)
                    {
                        foreach (var item2 in TotalNumberOfUsersInGrp)
                        {
                            //Todo...
                            //Print Group 1 as a header 
                            //Print the fullName of the first 5 players under the title group1
                            //Next Print Group 2 as a header
                            //Print the 5 next names under the group 2 header.
                        }
                    }
                }

                public static List<PlayerInformation> RankPlayers()
                {          
                    List<PlayerInformation> objPlayers = new List<PlayerInformation>();
                    objPlayers.Add( new PlayerInformation{fullName = "Tola", rating = "1001"});
                    objPlayers.Add( new PlayerInformation{fullName = "David", rating = "1002"});
                    objPlayers.Add( new PlayerInformation{fullName = "Bayo", rating = "1003"});
                    objPlayers.Add( new PlayerInformation{fullName = "Sumbo", rating = "1005"});
                    objPlayers.Add( new PlayerInformation{fullName = "Demola", rating = "1008"});
                    objPlayers.Add( new PlayerInformation{fullName = "Patrick", rating = "2001"});
                    objPlayers.Add( new PlayerInformation{fullName = "Folusho", rating = "2004"});
                    objPlayers.Add( new PlayerInformation{fullName = "Olawale", rating = "2006"});
                    objPlayers.Add( new PlayerInformation{fullName = "Johnson", rating = "2008"});
                    objPlayers.Add( new PlayerInformation{fullName = "Ibrahim", rating = "1006"});
                    return objPlayers.ToList();
                }
            }

Answer 1

你必须使用嵌套的foreach吗？第一个foreach输出所有玩家的结果（按比率下降）。如果你想一次打印5个玩家，你可以使用另一个玩家循环，或者在第一个foreach循环中打印5个玩家，如下所示：

    int playerIndex=0;
    int groupIndex=1;
    foreach (var item in queryResult)
    {
         if((playerIndex%TotalNumberOfUsersInGrp)==0){
               Console.WriteLine("group:" + groupIndex);
               groupIndex++;
         }
         Console.WriteLine("player:" + item.fullName);
         playerIndex++;
    }

使用嵌套的foreach对数据进行分组

1 个答案: