如何在 C# 中对二维数组进行排序

问题描述

我已经阅读了很多关于对二维数组进行排序的帖子，但我仍然无法掌握它，所以我想知道是否有人可以给我一些建议...

I've read lots of posts about sorting a 2D array but I still can't master it so I was wondering if anyone can offer me some advice...

我有一个列出字母和数量的数组(我正在对一段文本进行频率分析).我已将此数据读入一个矩形数组，需要先按最高频率对其进行排序.到目前为止，这是我的代码:

I have an aray which lists letters and quantity (I'm doing a frequency anaysis on a piece of text). I've read this data into a rectangle array and need to order it by highest frequency first. Here's my code so far:

    //create 2D array to contain ascii code and quantities
    int[,] letterFrequency = new int[26, 2];

    //fill in 2D array with ascaii code and quantities
    while (asciiNo <= 90)
     {

       while ((encryptedText.Length - 1) > counter)
      {
                if (asciiNo == (int)encryptedText[index])
               {
                      letterCount++;
               }
                counter++;
                index++;
      }

    letterFrequency[(storeCount), (0)] = (char)(storeCount+66);
    letterFrequency[(storeCount), (1)] = letterCount;
    storeCount++;
    counter=0;
    index=0;
    letterCount = 0;
    asciiNo++;
    }

推荐答案

您正在使用 2D 数组来表示 2 个单独的向量 - 符号和计数.相反，使用 2 个单独的数组.Array.Sort 有一个重载，它接受 2 个数组，并对 一个 数组进行排序，但将更改应用于两者，实现您想要的.

You are using a 2D array to represent 2 separate vectors - the symbols and the counts. Instead, use 2 separate arrays. Array.Sort has an overload that takes 2 arrays, and sorts on one array, but applies the changes to both, achieving what you want.

这也将允许您对字符使用 char[] 而不是 int[]:

This would also allow you to use a char[] for the characters rather than int[]:

char[] symbols = ...
int[] counts = ...
...load the data...
Array.Sort(counts, symbols);
// all done!

此时点，计数已排序，并且符号仍将逐个索引与它们相关的计数匹配.

At thispoint, the counts have been ordered, and the symbols will still match index-by-index with the count they relate to.

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