对字典集合进行排序 [英] Sorting on dictionary collection

问题描述

如何对字典值集合进行排序，如值为4 5/8

 6 3/4 
 9 3/4 
 11 1 / 4 
 15 1/4 
 8 1/2 
 11 7/8 
 14 3/4 
 16 
 19 5/8 
 13 1/2 
 7 
 15 
 23 3/4 
 7 3/4 
 11 3/8 
 12 1/2 
 7 1/8 
 16 1/16 
 12 
 9 
 5 1/2 

提前致谢。

解决方案

这些不是字典条目：字典是一个特定的集合，它有一个Key（必须是唯一的）和一个Value（不需要be）。



字典通常不是排序的：它作为哈希表工作，因此按键或值排序会降低访问速度。但是有一个SortedDictionary类按键排序，但检索比标准Dictionary慢，因为它存储为列表，而不是哈希表。



但是，如果您有一个包含分数字符串值的列表，并且您想要对其进行排序，则需要先将它们转换为数值：

  private   void  myButton_Click（ object  sender，EventArgs e） 
 {
 List< string> fractions =  new  List< string>（）{
   6 3/4，  9 3/4，  11 1/4，  15 1/4，  8 1/2，
   11 7/8，  14 3/4，  16，  19 5/8，  13 1/2，  7}; 
 List< string> sortedFractions = fractions.OrderBy（f = >  ToValue（f））。ToList（）; 
  foreach （ string  s  in  sortedFractions）
 {
 Console.WriteLine（s）; 
} 
} 
 私有 静态  double  ToValue（ string  fraction）
 {
  double  result =  0 。 0 ; 
  string  [] parts = fraction.Split（ new   char  [] {' '}，StringSplitOptions.RemoveEmptyEntries）; 
  if （parts.Length >   0 ）
 {
 result =  double  .Parse（parts [ 0 ]）; 
  if （parts.Length >   1 ）
 {
 parts = parts [ 1 ]。分割（ new   char  [] {'  /'}，StringSplitOptions.RemoveEmptyEntries）; 
  if （parts.Length ==  2 ）
 result + =  double  .Parse（parts [ 0 ]）/  double  .Parse（parts [ 1 ]）; 
} 
} 
 返回结果; 
} 
 

您好，



请参阅以下链接。它可能对您有所帮助..



http：// www。 dotnetperls.com/sort-dictionary [ ^ ]

How to sort dictionary values collection like values are 4 5/8

6  3/4
9  3/4
11 1/4
15 1/4
8  1/2
11 7/8
14 3/4
16
19 5/8
13 1/2
7
15
23 3/4
7  3/4
11 3/8
12 1/2
7  1/8
16 1/16
12
9
5  1/2

Thanks in advance .

解决方案

Those aren't Dictionary entries: a Dictionary is a specific collection that has a Key (which must be unique) and a Value (which doesn't have to be).

Dictionaries are not normally sorted: it works as a Hash Table, so sorting by key or value would slow down access. There is however a SortedDictionary class that does sort by Key, but retrieval is slower than a standard Dictionary as it is stored as a list, rather than a Hash Table.

If, however, you have a list containing string values of fractions, and you want to sort that, you need to convert them to a numeric value first:

private void myButton_Click(object sender, EventArgs e)
    {
    List<string> fractions = new List<string>() {
            "6 3/4", "9 3/4", "11 1/4", "15 1/4", "8 1/2",
            "11 7/8","14 3/4","16","19 5/8","13 1/2","7"};
    List<string> sortedFractions = fractions.OrderBy(f => ToValue(f)).ToList();
    foreach (string s in sortedFractions)
        {
        Console.WriteLine(s);
        }
    }
private static double ToValue(string fraction)
    {
    double result = 0.0;
    string[] parts = fraction.Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);
    if (parts.Length > 0)
        {
        result = double.Parse(parts[0]);
        if (parts.Length > 1)
            {
            parts = parts[1].Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
            if (parts.Length == 2)
            result += double.Parse(parts[0]) / double.Parse(parts[1]);
            }
        }
    return result;
    }

Hi,

Please see the below link. It might be helpful to you..

http://www.dotnetperls.com/sort-dictionary[^]

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