Question

求大神求救：未能找到类型或命名空间名称“ArrayList”(是否缺少 using 指令或程序集引用?)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication10

{
public class NameListEventArgs : EventArgs
{
public string Name { get; set; }
public int Count { get; set; }
public NameListEventArgs(string name, int count)
{
Name = name;
Count = count;
}
public delegate void NameListEventHandler(object source, NameListEventArgs args);
public class NameList
{
ArrayList list;
public event NameListEventHandler nameListEvent;
public NameList()
{
list = new ArrayList();
}
public void Add(string Name)
{
list.Add(Name);
if (nameListEvent != null)
{
nameListEvent(this, new NameListEventArgs(Name, list.Count));
}
}
}
这个是接下来的代码，不知道什么总是报错，我照着书里打的

Answer 1

using System.Collection;

追问

这样改了还是不行

追答

using System.Collections;

少打了一个s

追问

好厉害，可以了，麻烦再帮我看看好吗

被遮住的代码是StudentGrade [] grades = {new StudentGrade ("张三",99),new StudentGrade ("李四",68),new StudentGrade ("王五",89),new StudentGrade ("姚六",76)};    还是没办法通过