这是我想出的解决方案的示例
using System;
using System.Linq;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
int[] arr = new int[] { 1, 2, 2, 3, 3, 3, 4, 4, 4, 4 };
var countlist = arr.Aggregate(new Dictionary<int,int>(), (D,i) => {
D[i] = D.ContainsKey(i) ? (D[i] + 1) : 1;
return D;
})
.AsQueryable()
.OrderByDescending(x => x.Value)
.Select(x => x.Key)
.ToList();
// print the element which appears with the second
// highest frequency in arr
Console.WriteLine(countlist[2]); // should print 3
}
}
至少,我想弄清楚如何
int[] arr = new int[] { 1, 2, 2, 3, 3, 3, 4, 4, 4, 4 };
var lookup = arr.ToLookup(t => t);
var result = lookup.OrderByDescending(t => t.Count());
Console.WriteLine(result.ElementAt(1).Key);
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