如何在c中声明像php array_count_值这样的函数?

int[] array = new[] { 1, 1, 2, 3, 3, 5 };
var counts = array.GroupBy(x => x)
                  .Select(g => new { Value = g.Key, Count = g.Count() });
foreach(var count in counts) {
    Console.WriteLine("[{0}] => {1}", count.Value, count.Count);
}

或者,你可以得到 Dictionary<int, int> 就像这样:

int[] array = new[] { 1, 1, 2, 3, 3, 5 };
var counts = array.GroupBy(x => x)
                  .ToDictionary(g => g.Key, g => g.Count());

编辑

对不起,我发现我之前的回答不对。您需要计算每种类型的唯一值。

可以使用字典存储值类型:

object[] myArray = { 1, 1, 2, 3, 3, 5 };
Dictionary<object, int> valueCount = new Dictionary<object, int>();
foreach (object obj in myArray)
{
    if (valueCount.ContainsKey(obj))
        valueCount[obj]++;
    else
        valueCount[obj] = 1;
}

如果你想数数除整数以外的数,试试这个

public static Dictionary<dynamic, int> Count(dynamic[] array) 
  {

   Dictionary<dynamic, int> counts = new Dictionary<dynamic, int>();

   foreach(var item in array) {

    if (!counts.ContainsKey(item)) {
     counts.Add(item, 1);
    } else {
     counts[item]++;
    }


   }

  return counts;    
  }