c# - 添加数组元素

Question

我有一个十元素整数数组。我想按组对元素求和，例如，我想将元素 0 的值与元素 1 的值相加，然后是元素 2 的值，然后是元素 3 的值，依此类推直到元素 9，然后添加元素 1 的值与 2,3 的值，一直到 9，直到将每组 2 个值相加并存储在变量中。然后我想重复这个过程，每组 3 人，每组 4 人，每组 5 人，一直到每组 10 人。每个结果总数都存储在一个单独的变量中。到目前为止，我唯一能弄清楚如何去做的方法是:-

int i = 0;
int p = 1;
int q = 2;
int r = 3;

while (i < NumArray.Length - 3)
{
    while (p < NumArray.Length - 2)
    {
        while (q < NumArray.Length-1)
        {
            while (r < NumArray.Length)
            {
                foursRet += NumArray[i] + NumArray[p] + NumArray[q]+ NumArray[r];
                r++; 
            }
            q++;
            r = q + 1;
        }
        p++;
        q = p + 1;
        r = q + 1;
    }
    i++;
    p = i + 1;
    q = i + 2;
    r = i + 3;
}

上面是一个 4 组求和的例子。我想知道是否有人可以友好地向我展示一种更简洁、更优雅的方式来实现我想要的。非常感谢。

Answer 1

因为有了 LINQ*，一切都变得更好了:

using System; // Output is below
using System.Linq;
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var inputArray = Enumerable.Range(0, 10).ToArray();

            var grouped =
                from Buckets in Enumerable.Range(1, inputArray.Length)
                from IndexInBucket in Enumerable.Range(0, inputArray.Length / Buckets)
                let StartPosInOriginalArray = IndexInBucket * Buckets
                select new
                {
                    BucketSize = Buckets,
                    BucketIndex = StartPosInOriginalArray,
                    Sum = inputArray.Skip(StartPosInOriginalArray).Take(Buckets).Sum()
                };

            foreach (var group in grouped)
            {
                Debug.Print(group.ToString());
            }

            Console.ReadKey();
        }
    }
} // SCROLL FOR OUTPUT

{ BucketSize = 1, BucketIndex = 0, Sum = 1 }
{ BucketSize = 1, BucketIndex = 1, Sum = 2 }
{ BucketSize = 1, BucketIndex = 2, Sum = 3 }
{ BucketSize = 1, BucketIndex = 3, Sum = 4 }
{ BucketSize = 1, BucketIndex = 4, Sum = 5 }
{ BucketSize = 1, BucketIndex = 5, Sum = 6 }
{ BucketSize = 1, BucketIndex = 6, Sum = 7 }
{ BucketSize = 1, BucketIndex = 7, Sum = 8 }
{ BucketSize = 1, BucketIndex = 8, Sum = 9 }
{ BucketSize = 1, BucketIndex = 9, Sum = 10 }
{ BucketSize = 2, BucketIndex = 0, Sum = 3 }
{ BucketSize = 2, BucketIndex = 2, Sum = 7 }
{ BucketSize = 2, BucketIndex = 4, Sum = 11 }
{ BucketSize = 2, BucketIndex = 6, Sum = 15 }
{ BucketSize = 2, BucketIndex = 8, Sum = 19 }
{ BucketSize = 3, BucketIndex = 0, Sum = 6 }
{ BucketSize = 3, BucketIndex = 3, Sum = 15 }
{ BucketSize = 3, BucketIndex = 6, Sum = 24 }
{ BucketSize = 4, BucketIndex = 0, Sum = 10 }
{ BucketSize = 4, BucketIndex = 4, Sum = 26 }
{ BucketSize = 5, BucketIndex = 0, Sum = 15 }
{ BucketSize = 5, BucketIndex = 5, Sum = 40 }
{ BucketSize = 6, BucketIndex = 0, Sum = 21 }
{ BucketSize = 7, BucketIndex = 0, Sum = 28 }
{ BucketSize = 8, BucketIndex = 0, Sum = 36 }
{ BucketSize = 9, BucketIndex = 0, Sum = 45 }
{ BucketSize = 10, BucketIndex = 0, Sum = 55 }

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^{*LINQ 并非一切都更好}