C#集合与接口(二)IEnumerable<T>接口

//字符中迭代
    public class ListBoxTest: IEnumerable<String>
    {
        private string[] strings;
        private int ctr = 0;
        //可枚举的类可以返回枚举
        public IEnumerator<string> GetEnumerator()
        {
            foreach (string s in strings)
            {
                yield return s;//返回可枚举对象
            }
        }
        public ListBoxTest(params string[] initStrings)
        {
            strings = new string[initStrings.Length];
            foreach(string s  in initStrings)
            {
                strings[ctr++] = s;
                
            }

        }
        public void Add(string s){
            strings[ctr] = s;
            ctr++;
         }
        public string this[int index]{

             get{
              
                if(index < 0) || (index > strings.Length)
                {
                    throw new IndexOutOfRangeException();
                }
               return strings[index]

             }
            set
            {
                strings[index] =value;
            }
        }
        public int GetStringCount(){
            return ctr;
        }
    }
  

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