希望这会有所帮助。我不确定这是解决您的问题的最佳方法，但它应该可以帮助您熟悉一些选项/看看为什么这里的一些人反对它。如果您让我们更多地了解您正在尝试做的事情，我们可以更好地建议替代方法。
using System;
using System.Collections.Generic;
using System.Linq;
namespace StackOverflow.Demos
{
class Program
{
const string OutputFormat = "{0}: {1}";
public static void Main(string[] args)
{
new Program();
Console.WriteLine("Done");
Console.ReadKey();
}
public Program()
{
SortedDictionary<string, int> dic = new SortedDictionary<string, int>();
dic.Add("a", 1);
dic.Add("b", 2);
dic.Add("d", 2);
dic.Add("c", 1);
dic.Add("e", 1);
dic.Add("f", 3);
dic.Add("g", 4);
dic.Add("h", 2);
dic.Add("i", 2);
OutputByKeyAsc(dic);
OutputByKeyDesc(dic);
OutputByValueFrequency(dic);
}
void OutputByKeyAsc(SortedDictionary<string, int> dic)
{
Console.WriteLine("OutputByKeyAsc");
foreach (string key in dic.Keys)
{
Console.WriteLine(string.Format(OutputFormat, key, dic[key]));
}
}
void OutputByKeyDesc(SortedDictionary<string, int> dic)
{
Console.WriteLine("OutputByKeyDesc");
foreach (string key in dic.Keys.Reverse())
{
Console.WriteLine(string.Format(OutputFormat, key, dic[key]));
}
}
void OutputByValueFrequency(SortedDictionary<string, int> dic)
{
Console.WriteLine("OutputByValueFrequency");
IEnumerable<KeyValuePair<int,int>> values =
(
from sortedItem
in
(
from entry
in dic
group entry
by entry.Value
into result
select new KeyValuePair<int,int>(result.Key , result.Count())
)
orderby sortedItem.Value descending
select sortedItem
).ToArray();
foreach (KeyValuePair<int, int> value in values)
{
foreach (KeyValuePair<string, int> item in dic.Where<KeyValuePair<string, int>>(item => item.Value == value.Key))
{
Console.WriteLine(string.Format(OutputFormat, item.Key, string.Format(OutputFormat, item.Value, value.Value)));
}
}
}
}
}
祝你好运/希望到目前为止你喜欢 c#。
编辑
根据您问题中的新信息，这是我尝试更简洁的解决方案：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace StackOverflow.Demos
{
class Program
{
const string OutputFormat = "{0}: {1}";
public static void Main(string[] args)
{
new Program("Another great story and another great adventure.");
Console.WriteLine("Done");
Console.ReadKey();
}
public Program(string userInput)
{
//break string into words
IEnumerable<IGrouping<string, int>> words = Regex.Split(userInput, @"\W+").GroupBy(word => word.ToLowerInvariant(), word => 1); //nb converting word to lower case to avoid case sensitive comparisons in grouping - I can keep the original value(s) by replacing "word => 1" with "word => word" if needed
Console.WriteLine("\nWords in alphabetic order");
foreach (IGrouping<string, int> wordInfo in words.OrderBy(word => word.Key))
{
Console.WriteLine(string.Format(OutputFormat, wordInfo.Key,wordInfo.Count()));
}
Console.WriteLine("\nWords in descending alphabetic order");
foreach (IGrouping<string, int> wordInfo in words.OrderByDescending(word => word.Key))
{
Console.WriteLine(string.Format(OutputFormat, wordInfo.Key, wordInfo.Count()));
}
Console.WriteLine("\nWords by frequency (desc)");
foreach (IGrouping<string, int> wordInfo in words.OrderByDescending(word => word.Count()))
{
Console.WriteLine(string.Format(OutputFormat, wordInfo.Key, wordInfo.Count()));
}
}
}
}
编辑
以下是类中的功能和程序中保留的输出的相同代码：
使用系统；
使用 System.Collections.Generic；
使用 System.Linq；
使用 System.Text.RegularExpressions;
namespace StackOverflow.Demos
{
class Program
{
const string OutputFormat = "{0}: {1}";
public static void Main(string[] args)
{
new Program("Another great story and another great adventure.");
Console.WriteLine("Done");
Console.ReadKey();
}
public Program(string userInput)
{
WordCounter myWordCounter = new WordCounter(userInput);
Console.WriteLine("\n**Alphabetical**");
foreach (KeyValuePair<string, int> wordInfo in myWordCounter.GetWordCountByWordAlphabeticalDesc())
{
Console.WriteLine(string.Format(OutputFormat,wordInfo.Key, wordInfo.Value));
}
Console.WriteLine("\n**Alphabetical Desc**");
foreach (KeyValuePair<string, int> wordInfo in myWordCounter.GetWordCountByWordAlphabeticalDesc())
{
Console.WriteLine(string.Format(OutputFormat, wordInfo.Key, wordInfo.Value));
}
Console.WriteLine("\n**Frequency Desc**");
foreach (KeyValuePair<string, int> wordInfo in myWordCounter.GetWordCountByFrequency())
{
Console.WriteLine(string.Format(OutputFormat, wordInfo.Key, wordInfo.Value));
}
}
}
public class WordCounter
{
string sentance;
IEnumerable<IGrouping<string, int>> words;
public WordCounter(string sentance)
{
this.sentance = sentance;
GetWords();
}
void GetWords()
{
this.words = Regex.Split(this.sentance, @"\W+").GroupBy(word => word.ToLowerInvariant(), word => 1);
}
public IEnumerable<KeyValuePair<string, int>> GetWordCountByWordAlphabetical()
{
return this.words.OrderBy(word => word.Key).Select(wordInfo => new KeyValuePair<string,int>(wordInfo.Key, wordInfo.Count()));
}
public IEnumerable<KeyValuePair<string, int>> GetWordCountByWordAlphabeticalDesc()
{
return this.words.OrderByDescending(word => word.Key).Select(wordInfo => new KeyValuePair<string, int>(wordInfo.Key, wordInfo.Count()));
}
public IEnumerable<KeyValuePair<string, int>> GetWordCountByFrequency()
{
return this.words.OrderByDescending(word => word.Count()).Select(wordInfo => new KeyValuePair<string, int>(wordInfo.Key, wordInfo.Count()));
}
}
}