c#的字典序

//Dictionary
System.Collections.DictionaryEntry dic=new System.Collections.DictionaryEntry("key1","value1"); 

Dictionary<int, string> fruit = new Dictionary<int, string>(); 

//加入重复键会引发异常
fruit.Add(, "苹果");
fruit.Add(, "桔子");
fruit.Add(, "香蕉");
fruit.Add(, "菠萝"); 

//因为引入了泛型，所以键取出后不需要进行Object到int的转换，值的集合也一样
foreach (int i in fruit.Keys)
{
Console.WriteLine("键是：{0} 值是：{1}",i,fruit);
}
//删除指定键，值
fruit.Remove();
//判断是否包含指定键
if (fruit.ContainsKey())
{
Console.WriteLine("包含此键");
}
//清除集合中所有对象
fruit.Clear();
}