查找數組中重復最多的項

string[] arr1 = {"廣州", "中國", "上海", "北京","中國"}; 
 
            Dictionary<string ,int> d = new Dictionary<string,int>(); 
 
            foreach (var item in arr1) 
            { 
                if (d.ContainsKey(item)) 
                { 
                   d[item]=d[item] + 1; 
                } 
                else 
                { 
                    d.Add(item, 1); 
                }                 
            } 
 
            string s = d.OrderByDescending(p=>p.Value).First().Key; 
 
            Console.WriteLine(s); 
            Console.ReadKey(); 

摘自 歐陽小燕