计算KeyValuePair中的值总和

问题描述

我团队的KeyValuePair具有以下值
         私有静态List< KeyValuePair< string，int>> d = new List< KeyValuePair< string，int>>>();

I team i have KeyValuePair with below values
           private static List<KeyValuePair<string, int>> d = new List<KeyValuePair<string, int>>();

       静态void Main(string [] args)
        {
            d.Add(new KeyValuePair< string，int>("joe"，100));
            d.Add(new KeyValuePair< string，int>("joe"，200));
            d.Add(new KeyValuePair< string，int>("jim"，100));
            var result = d.Where(x => x.Key =="joe");
                                       foreach(结果为var q)
                                    Console.WriteLine(q.Value  );
                                       Console.ReadLine();
        }

         static void Main(string[] args)
         {
              d.Add(new KeyValuePair<string, int>("joe", 100));
              d.Add(new KeyValuePair<string, int>("joe", 200));
              d.Add(new KeyValuePair<string, int>("jim", 100));
              var result = d.Where(x => x.Key == "joe");
             foreach(var q in result)
                 Console.WriteLine(q.Value   );
             Console.ReadLine();
         }

何时我将上述keyvaluepair传递为输入，它应该返回另一个resut键值对(例如
)中的项的总和乔300
吉姆100

when  i pass above keyvaluepair as input, it should return a sum of items items in another resut key value pair like
joe, 300
jim,100

有帮助吗?

推荐答案

KeyValuePairs实际上并不是要以这种方式使用.使用Tuple或您自己的定制类会更好.

KeyValuePairs really are not meant to be used in this way. You would be better off using a Tuple or your own custom-made class.

但是，如果您坚持使用KeyValuePairs，这是一种可行的方法.

But if you insist on using KeyValuePairs, here is one way that might work.

      static void Main(string[] args)
      {
         d.Add(new KeyValuePair<string, int>("joe", 100));
         d.Add(new KeyValuePair<string, int>("joe", 200));
         d.Add(new KeyValuePair<string, int>("jim", 100));

         List<KeyValuePair<string, int>> sums = new List<KeyValuePair<string, int>>();
         foreach(KeyValuePair<string, int> pair in d)
         {
            if(sums.FindIndex(x => x.Key == pair.Key) < 0)
            {
               int total = d.Where(x => x.Key == pair.Key).Sum(x => x.Value);
               sums.Add(new KeyValuePair<string, int>(pair.Key, total));
            }
         }

         foreach (var q in sums)
            Console.WriteLine("{0} {1}", q.Key, q.Value);
         Console.ReadLine();
      }

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