一、先來分別介紹一下ArrayList，Hashtable，List<T>，Dictionary<K,V>
1.ArrayList動(dòng)態(tài)數(shù)組，保存值的時(shí)候比較好用
2.Hashtable以存儲(chǔ)鍵值對(duì)的方式存儲(chǔ)。value，和key
3.List<T> 和 Dictionary<K,V> 應(yīng)該是泛型吧，可以保存實(shí)體類
二、各種集合的遍歷方法演示
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(gè)Hashtable只能用foreache()方法//遍歷Keyforeach (Object obj in list.Keys){ Console.WriteLine((string)obj);}//遍歷Valueforeach (Object obj in list.Values){ SE se = (SE)obj; Console.WriteLine(se.Name);}//同時(shí)遍歷，DictionaryEntry一個(gè)結(jié)構(gòu)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(shí)不需要類型轉(zhuǎn)換 Console.WriteLine(list[i]);}//foreach遍歷foreach (SE obj in list){ //遍歷時(shí)不需要類型轉(zhuǎn)換 Console.WriteLine(obj);} 4.Dictionary<K,V>
//遍歷Valuesforeach (SE se in list.Values){ //遍歷時(shí)不需要類型轉(zhuǎn)換 Console.WriteLine(se);}//同時(shí)遍歷foreach (KeyValuePair<string, SE> en in list){ Console.WriteLine(en.Key); Console.WriteLine(en.Value.Name);}//KeyValuePair<TKey,TValue>是一個(gè)泛型結(jié)構(gòu) 
