关于c＃：如何访问List＆lt; int＆gt;

How would one access a List<int> as a List<T> object?

本问题已经有最佳答案，请猛点这里访问。

对于这个新问题，我深表歉意，但我很难理解如何访问一个通用列表中的int列表，然后将所有这些信息显示到一个列表视图(winform)中。这是我到目前为止所拥有的…

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}
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} }

};

PopulateListView(students);

GetAverageGrade();

}

public void GetAverageGrade()
{
foreach (Student s in students)
{
double avg = s.Scores.Average();

}

}

public void PopulateListView(List<Student> list)
{

listView1.SuspendLayout();

for (int i = 0; i < list.Count; i++)
{

// create a list view item
var lvi = new ListViewItem(list[i].ToListViewItem());
// assign class reference to lvi Tag for later use
lvi.Tag = list[i];
// add to list view
listView1.Items.Add(lvi);

//This adjust the width of 1st column to fit data.
listView1.AutoResizeColumn(0, ColumnHeaderAutoResizeStyle.ColumnContent);
listView1.ResumeLayout();
}

}
}

到目前为止，我已经能够用名字和学生ID填充listView的前三列，但最后一列中我要做的就是"systems.collections.generic…"等。

任何帮助都会非常感谢，谢谢。

您可能正在使用返回类名的Scores.ToString()方法。你可以试试：用string.Join(",", Scores)代替。这将包含用,分隔的所有值。

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public string[] ToListViewItem()
{
return new string[] {
First,
Last,
ID.ToString(),
string.Join(",", Scores)
};
}