读取多个文本文件并将内容存储到数组中

Question

我写了一个c#程序，从5个文本文件中读取数据，并根据给定的关键字统计它们

        string[] word_1 = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D1_H1.txt").Split(' ');
        string[] word_2 = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D2_H1.txt").Split(' ');
        string[] word_3 = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D3_H2.txt").Split(' ');
        string[] word_4 = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D4_H2.txt").Split(' ');
        string[] word_5 = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D5_H2.txt").Split(' ');
        string[] given_doc = File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\Given_doc.txt").Split(' ');

这就是我从文本文件中读取的方式，在阅读完之后我使用 for 循环和 if 循环来计算软管文件中的每个单词

for (int i = 0; i < word_1.Length; i++)

        {

            string s = word_1[i];


                if ("Red".Equals(word_1[i]))
                {
                    //Console.WriteLine(word[i]);

                    h1_r++;
                }
                if ("Green".Equals(word_1[i]))
                {
                    h1_g++;
                }
                if ("Blue".Equals(word_1[i]))
                {
                    h1_b++;
                }

        }

这是我用来从一个文件中获取计数的循环，它工作正常，我做了 5 次这个过程来读取所有文件，我的问题是我如何使用一个 for 循环读取这 5 个文件并将它们存储在一个数组（每个关键字的计数）

提前致谢！！

Answer 1

LINQ 查询是您最简单的解决方案：

var filenames = new[] { "D1_H1.txt", "D2_H1.txt", "D3_H2.txt" };
var words = new[] { "Red", "Green", "Blue" };
var counters = 
  filenames.Select(filename => Path.Combine(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment", filename))
           .SelectMany(filepath => File.ReadAllLines(filepath))
           .SelectMany(line => line.Split(new[] { ' ' }))
           .Where(word => words.Contains(word))
           .GroupBy(word => word, (key, values) => new
              {
                 Word = key,
                 Count = values.Count()
              })
           .ToDictionary(g => g.Word, g => g.Count);

然后您在所有文件中都有单词计数器字典：

int redCount = counters["Red"];

如果你想为每个文件存储计数器，你可以使用稍微修改的查询：

var filenames = new[] { "D1_H1.txt", "D2_H1.txt", "D3_H2.txt" };
var words = new[] { "Red", "Green", "Blue" };
var counters =
  filenames.Select(filename => Path.Combine(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment", filename))
           .Select(filepath => new
           {
              Filepath = filepath,
              Count = File.ReadAllLines(filepath)
                          .SelectMany(line => line.Split(new[] { ' ' }))
                          .Where(word => words.Contains(word))
                          .GroupBy(word => word, (key, values) => new
                           {
                              Word = key,
                              Count = values.Count()
                           })
                          .ToDictionary(g => g.Word, g => g.Count)
            })
            .ToDictionary(g => g.Filepath, g => g.Count);

然后相应地使用它：

int redCount = counters[@"C:\Users\(...)\D1_H1.txt"]["Red"];

Answer 2

复制粘贴代码一般不好。它会导致代码违反 Don't Repeat Yourself (DRY) 规则。重构你的代码：

const string path = @"C:\Users\Niyomal N\Desktop\Assignment\Assignment";
string[] files = new string[] { "D1_H1.txt", "D2_H1.txt", "D3_H1.txt", ... };

foreach (string file in files) {
    string fullPath = Path.Combine(path, file);
    //TODO: count words of file `fullPath`
}

将单词计数存储在数组中并不是最佳选择，因为您必须针对文件中遇到的每个单词遍历数组。 改用具有恒定查找时间的字典。这要快得多。

var wordCount = new Dictionary<string, int>();

然后你可以像这样计算单词：

int count;
if (wordCount.TryGetValue(word, out count)) {
    wordCount[word] = count + 1;
} else {
    wordCount[word] = 1;
}

---

更新

你可以测试这样的关键字

var keywords = new HashSet<string> { "Red", "Green", "Blue" };

string word = "Green";
if (keywords.Contains(word)) {
    ...
}

HasSet 和字典一样快。

注意单词大小写。 HashSets 默认区分大小写。如果必须全部找到“red”、“Red”和“RED”，请像这样初始化HashSet：

var keywords = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase)
    { "Red", "Green", "Blue" };

Answer 3

List<KeyValuePair<string, string>> completeList = new List<KeyValuePair<string, string>>();

            completeList.AddRange("D1_H1.txt",File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D1_H1.txt").Split(' '));
            completeList.AddRange("D1_H2.txt", File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D2_H1.txt").Split(' '));
            completeList.AddRange("D1_H3.txt", File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D3_H2.txt").Split(' '));
            completeList.AddRange("D1_H4.txt", File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D4_H2.txt").Split(' '));
            completeList.AddRange("D1_H5.txt", File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\D5_H2.txt").Split(' '));
            completeList.AddRange("D1_H6.txt", File.ReadAllText(@"C:\Users\Niyomal N\Desktop\Assignment\Assignment\Given_doc.txt").Split(' '));


            var result = completeList.GroupBy(r => r.Key).Select(r => new {File = r.Key, Red = r.Count(s => s.Value == "red"), Green = r.Count(s => s.Value == "green"), Blue = r.Count(s => s.Value == "blue") });
            foreach (var itm in result)
            {
                Console.WriteLine(itm.File);
                Console.WriteLine(itm.Red);
                Console.WriteLine(itm.Green);
                Console.WriteLine(itm.Blue);

            }