c# - 如何跟踪文本文件中的字数

Question

我正在尝试计算文本文件中每个单词的出现次数(不区分大小写)并将单词及其计数存储在列表中。

这是我要存储在列表中的每个单词的对象类，

public class WordItem
{
    public string Word { get; set; }
    public int Count { get; set; }
}

和我的代码函数来解析文本文件

public List<WordItem> FindWordCount()
{
    //I've successfully parsed the text file into a list
    //of words and stripped punctuation up to this point
    //and stored them in List<string> wordlist.

    List<string> wordlist;
    List<WordEntry> entries = new List<WordEntry>();

    foreach (string word in wordlist)
    {
        WordItem temp = new WordItem();
        temp.Word = word;
        temp.Count = 1;
        entries.Add(temp);
    }
}

如何编辑我的字数统计功能以防止列表中出现重复的字词，并在每次我再次找到该字词时增加计数值？

Answer 1

我会使用带有不区分大小写的字符串比较器的 Dictionary:

public IEnumerable<WordItem> FindWordCount(IEnumerable<string> wordlist)
{
    var wordCount = new Dictionary<string, int>(StringComparer.CurrentCultureIgnoreCase);
    foreach (string word in wordlist)
    {
        int count = 0;
        bool contained = wordCount.TryGetValue(word, out count);
        count++;
        wordCount[word] = count;
    }
    foreach (var kv in wordCount)
        yield return new WordItem { Word = kv.Key, Count = kv.Value };
}

你可以这样使用它:

var wordList = new string[] { "A", "a", "b", "C", "a", "b" };
var wordCounts = FindWordCount(wordList).ToList();