Dictionary
     
       list = new Dictionary
      
       (); list.Add("d", 1); foreach (var item in list)             {
                   Console.WriteLine(item.Key + item.Value);             } //KeyValuePair
       
         foreach (KeyValuePair
        
          kv in list)             {
                   Console.WriteLine(kv.Key + kv.Value);             } //通过键的集合取 foreach (string key in list.Keys)             {
                   Console.WriteLine(key + list[key]);             } //直接取值 foreach (int val in list.Values)             {
                   Console.WriteLine(val);             } //非要采用for的方法也可             List
         
           test = new List
          
           (list.Keys); for (int i = 0; i < list.Count; i++) { Console.WriteLine(test[i] + list[test[i]]); }