c# - 我需要帮助在 C# 中显示文本文件中的单词(字符串)

Question

我需要帮助在控制台应用程序中显示文本文件中的单词。例如，我的输入字符串是“the”，代码将读取文本文件并输出包含“the”的单词，例如“The”和“father”。我已经准备好代码，但它输出的是整个句子，包括单词而不是单词本身。代码如下所示:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace QuizTakeHome
{
    class Program
    {
        static void Main(string[] args)
        {
            string line;
            int counter = 0;

            Console.WriteLine("Enter a word to search for: ");
            string userText = Console.ReadLine();

            string file = "Gettysburg.txt";
            StreamReader myFile = new StreamReader(file);

            int found = 0;

            while ((line = myFile.ReadLine()) != null)
            {
                counter++;
                int index = line.IndexOf(userText, StringComparison.CurrentCultureIgnoreCase);
                if (index != -1)
                {
                    //Since we want the word that this entry is, we need to find the space in front of this word
                    string sWordFound = string.Empty;
                    string subLine = line.Substring(0, index);
                    int iWordStart = subLine.LastIndexOf(' ');
                    if (iWordStart == -1)
                    {
                        //If there is no space in front of this word, then this entry begins at the start of the line
                        iWordStart = 0;
                    }

                    //We also need to find the space after this word
                    subLine = line.Substring(index);
                    int iTempIndex = subLine.LastIndexOf(' ');
                    int iWordLength = -1;
                    if (iTempIndex == -1)
                    {    //If there is no space after this word, then this entry goes to the end of the line.
                        sWordFound = line.Substring(iWordStart);
                    }
                    else
                    {
                        iWordLength = iTempIndex + index - iWordStart;
                        sWordFound = line.Substring(iWordStart, iWordLength);

                    }

                    Console.WriteLine("Found {1} on the sentence: {1} on line number: {0}", counter, sWordFound, line);
                    found++;
                }
            }
            Console.WriteLine("A total of {0} occurences found", found);
        }
    }
   }

输出如下:

有人可以帮忙吗？

Answer 1

你可以从你的句子中创建标记并检查每个标记:

found = 0;
String[] tokens = line.Split(new char[] {' '});
foreach (String token in tokens) {
    if (token.IndexOf(userText, StringComparison.OrdinalIgnoreCase) != -1) {
        Console.WriteLine(token); // Do your stuff here
        found++; //increment to know how many times you found the word in the current line
    }
}
counter += found; //counter will contains all occurences in lines

此代码段使用您的代码(变量)。要创建我们的标记，我们必须拆分当前行，为此我们使用了 String.Split

我认为这是没有正则表达式函数的最佳方式。希望对您有所帮助。