今天在云和学院复习了以前的知识，又学习了ArrayList和HashTable
ArrayList实例：
ArrayList arr = new ArrayList();
int i = 123;
string str = "宋连城";
float f = 1.23f;
decimal d = 2.13m;
double dou = 22.16;
arr.Add(i);
arr.Add(str);
arr.Add(f);
arr.Add(d);
arr.Add(dou);
arr.Remove(dou);
arr.RemoveAt(2);
for (int j = 0; j < arr.Count; j++)
{
Console.WriteLine(arr[j]);
}
Console.ReadKey();
HashTable实例：
Hashtable hash = new Hashtable();
string id = "272012321029";
string name = "宋丽";
string id1 = "272012321028";
string name1 = "婷婷";
hash.Add(id,name);
hash.Add(id1,name1);
foreach (DictionaryEntry item in hash)
{
Console.WriteLine(item.Key);
Console.WriteLine(item.Value);
}
int[] array = {12,45,23,89 };
foreach (var item in array)
{
Console.WriteLine(item);
}
Console.ReadKey();
foreach语法：
List<int> list = new List<int>();
for (int i = 1; i < 100; i++)
{
list.Add(i);
}
foreach (var item in list)
{
Console.WriteLine(item);
}
Console.ReadKey();
Dictionary
Dictionary <TKey,TValue>
Dictionary实例：
Dictionary<int, string> dic = new Dictionary<int, string>();
dic.Add(1,"范冰冰");
dic.Add(2,"周韦彤");
dic.Add(3,"范玮琪");
dic.Add(4,"蔡国庆");
dic.Add(5, "孙俪");
foreach (var item in dic)
{
Console.WriteLine(item.Key);
Console.WriteLine(item.Value);
}
Console.ReadKey();
原文：http://www.cnblogs.com/songfang/p/4106635.html