http://www.cnblogs.com/net064/p/5534697.html

 foreach修改字典报集合已修改可能无：

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

         采用for的方法也可

            List<string> test = new List<string>(list.Keys);

 

            for (int i = 0; i < list.Count; i++)

            {

                Console.WriteLine(test[i] + list[test[i]]);

            }