如何将一个类型在FOREACH中使用

    //让类能在FOREACH循环中使用
    public class students  
    {
        int i = -1;

        student[] stus  ;
        public students() {
            stus = new student[2]{ new student("xx"),new student("wsenmin") };
        }
        public IEnumerator GetEnumerator()
        {
            return (IEnumerator)this; 
        } 
        public object Current
        {
            get{
                return  stus[i];
            }
        
        } 
        public bool MoveNext()
        {
            i++;
            return (i < stus.Length);
        }
        public void Reset() {
            i = -1;
        }
    }

GetEnumerator 将类转化为IEnumerator

Current 返回当前值

MoveNext 设置当前索引

Reset 重置索引

            students stus = new students();
            foreach (student item in stus)
            {
                Console.WriteLine(item.Name);
            }
            stus.Reset();
            foreach (student item in stus)
            {
                Console.WriteLine(item.Name);
            }