如何将 List<int> 作为 List<T> 对象访问？

Question

为 newb 问题道歉，但我很难思考如何访问通用列表中的整数列表，然后将所有这些信息显示到列表视图 (winform) 中。这是我到目前为止...

    }

    List<Student> students;

    public class Student

    {

        public string First { get; set; }

        public string Last { get; set; }

        public List<int> Scores { get; set; }

        public int ID { get; set; }

        public string[] ToListViewItem()

        {

            return new string[] {

                First,

                Last,

                ID.ToString(),

                Scores.ToString()

            };

        }

    }

    protected override void OnLoad(EventArgs e)

    {

        base.OnLoad(e);

        students = new List<Student>

        {

        new Student {First="Svetlana", Last="Omelchenko", ID=111, Scores= new List<int> {97, 92, 81, 60}},

        new Student {First="Claire", Last="O’Donnell", ID=112, Scores= new List<int> {75, 84, 91, 39}},

        new Student {First="Sven", Last="Mortensen", ID=113, Scores= new List<int> {88, 94, 65, 91}},

        new Student {First="Cesar", Last="Garcia", ID=114, Scores= new List<int> {97, 89, 85, 82}},

        new Student {First="Debra", Last="Garcia", ID=115, Scores= new List<int> {35, 72, 91, 70}},

        new Student {First="Fadi", Last="Fakhouri", ID=116, Scores= new List<int> {99, 86, 90, 94}},

        new Student {First="Hanying", Last="Feng", ID=117, Scores= new List<int> {93, 92, 80, 87}},

        new Student {First="Hugo", Last="Garcia", ID=118, Scores= new List<int> {92, 90, 83, 78}},

        new Student {First="Lance", Last="Tucker", ID=119, Scores= new List<int> {68, 79, 88, 92}},

        new Student {First="Terry", Last="Adams", ID=120, Scores= new List<int> {99, 82, 81, 79}},

        new Student {First="Eugene", Last="Zabokritski", ID=121, Scores= new List<int> {96, 85, 91, 60}},

        new Student {First="Michael", Last="Tucker", ID=122, Scores= new List<int> {94, 92, 91, 91} }

    };

到目前为止，我能够让我的列表视图的前三列填充姓名和学生 ID，但我在最后一列中得到的只是“Systems.Collections.Generic...”等。

Answer 1

您可能正在使用Scores.ToString()返回类名的方法。你可以试试：string.Join(", ", Scores)相反。这将连接所有以,.分隔的值。public string[] ToListViewItem(){&nbsp; &nbsp; return new string[] {&nbsp; &nbsp; &nbsp; &nbsp; First,&nbsp; &nbsp; &nbsp; &nbsp; Last,&nbsp; &nbsp; &nbsp; &nbsp; ID.ToString(),&nbsp; &nbsp; &nbsp; &nbsp; string.Join(", ", Scores)&nbsp; &nbsp; };}

Answer 2

这就是Scores.ToString()返回。如果要显示有用的信息，则需要编写使用您的List<int>并返回有用信息的代码。从查看开始string.Join()。