ArrayList，Hashtable，List<T>，Dictionary<K,V>

1.ArrayList  

            ArrayList list = new ArrayList();
//for遍歷
            for (int i = 0; i < list.Count; i++)
            {
                SE se=(SE)list[i];
               Console.WriteLine(se.Name);
            }
//foreach遍歷
          foreach(Object obj in list)
          {
              SE se=(SE)list[i];
              Console.WriteLine(se.Name);      
           }

2.Hashtable

Hashtable  list=new Hashtable();

//Hashtable不能用索引訪問，所以遍歷一個Hashtable只能用foreache()方法

//遍歷Key
foreach(Object obj in list.Keys)
{
  Console.WriteLine((string)obj);
}
//遍歷Value
foreach(Object obj in list.Values)
{
  SE se=(SE)obj;
  Console.WriteLine(se.Name);
}
//同時遍歷，DictionaryEntry一個結構
foreach(DictionaryEntry en in list){
  Console.WriteLine(se.Keys);
  COnsole.WriteLine(((SE)en.Value).Name);
}

3.List<T>

          
//for遍歷
            for (int i = 0; i < list.Count; i++)
            {
                //遍歷時不需要類型轉換
               Console.WriteLine(list[i]);
            }
//foreach遍歷
          foreach(SE obj in list)
          {
                //遍歷時不需要類型轉換
              Console.WriteLine(obj);      
           }
//

4.Dictionary<K,V>

//遍歷Values
foreach(SE se in list.Values)
{
     //遍歷時不需要類型轉換
     Console.WriteLine(se);
}

//同時遍歷
foreach(KeyValuePair<string,SE> en in list)
{
  Console.WriteLine(en.Key);
  Console.WriteLine(en.Value.Name);
}
//KeyValuePair<TKey,TValue>是一個泛型結構