在 C# 中使用 while 循环搜索数组？

Question

我正在尝试使用 while 循环搜索数组，使用用户搜索输入，此时我已将一个单词电影标题列出到标准文本文件中，然后 while 循环继续搜索文件直到它找到了，然后在控制台上输出了。。但是我有个问题，操作符“==”不能应用于字符串变量？我将如何解决这个问题？非常感谢！圣诞快乐，这是我的代码：

        //Declare variables
        int iOneWordTitle= 0;
        string sSearch;

        //Declare array
        const int iFilm = 7;
        string[] sOneWordTitle = new string[iFilm];

        //Add heading to console
        Console.WriteLine("List of one word film titles");
        Console.WriteLine();

        //ask user what they want to search for
        Console.WriteLine("What film would you like to search for?");
        sSearch = Console.ReadLine();

        //Read the film names from the datafile
        using (StreamReader sr = new StreamReader("filmnames.txt"))
        {
            while (iOneWordTitle < iFilm)
            {
                sOneWordTitle[iOneWordTitle] = (sr.ReadLine());
                iOneWordTitle++;

                if (sSearch == sOneWordTitle)
                {
                    Console.WriteLine(sSearch + " was found at position " + iOneWordTitle);
                }

                else
                {
                    Console.WriteLine("The film was not found");
                }
            }

        }

Answer 1

1. 您可以使用File.ReadAllLines()轻松读取文本文件中的所有行，而不是使用StreamReader

2. 您还打印了 未找到胶片 7 次。如果您希望只打印一次，您可以保留一个 bool 变量来指示它未找到。

3. 您将文件中的标题数量预先配置为 7。如果文件中可以有更多标题怎么办？

所以，我想你可能想稍微改变一下你的代码：

        int iOneWordTitle = 0;
        string sSearch;

        //Add heading to console
        Console.WriteLine("List of one word film titles");
        Console.WriteLine();

        //ask user what they want to search for
        Console.WriteLine("What film would you like to search for?");
        sSearch = Console.ReadLine();

        //Read all titles from the text file
        string[] titles = File.ReadAllLines("filmnames.txt");

        //Search the array
        bool found = false;
        foreach (string title in titles)
        {
            if (title.Equals(sSearch))
            {
                Console.WriteLine(sSearch + " was found");
                found = true;
            }
        }

        //If the title wasn't found, print not found message
        if (!found)
            Console.WriteLine("The film was not found");

如果您仍想打印找到它的位置，您可以将 foreach 循环转换为常规循环：

        for (int iOneWordTitle = 0; iOneWordTitle < titles.Count(); iOneWordTitle++)
        {
            if (titles[iOneWordTitle].Equals(sSearch))
            {
                Console.WriteLine(sSearch + " was found at position " + iOneWordTitle);
                found = true;
            }
        }

Answer 2

应该是

if (sSearch == sOneWordTitle[iOneWordTitle])

而不是

if (sSearch == sOneWordTitle)

在您的版本中，您将字符串与字符串数组进行比较，而不是数组索引值。

我可能还会考虑你的变量名。

Answer 3

它必须是这样的：

if (sSearch == sOneWordTitle[iOneWordTitle])

不要在这里这样做：

 if (sSearch == sOneWordTitle)