在C＃中使用while循环搜索数组？

Question

我正在尝试使用while循环使用用户搜索输入来搜索数组，这是在我将一个单词电影标题列出到标准文本文件中的那一刻起，然后while循环一直在搜索文件直到找到为止，然后它在控制台上输出。。但是我有一个问题，运算符“ ==”无法应用于字符串变量？ 我该如何解决？ 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

它应该是

if (sSearch == sOneWordTitle[iOneWordTitle])

代替

if (sSearch == sOneWordTitle)

在您的版本中，您正在将字符串与字符串数组而不是数组索引值进行比较。

我可能还会考虑您的变量名。

Answer 2

它必须是这样的：

if (sSearch == sOneWordTitle[iOneWordTitle])

而不是在这里这样做：

 if (sSearch == sOneWordTitle)

Answer 3

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

2. 您还在打印找不到 7次底片 。 如果您只希望打印一次，则可以保留一个bool变量以指示未找到它。

3. 您已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，该怎么办？

因此，我认为您可能需要稍微更改代码：

        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");

如果仍然要打印找到它的位置，则可以将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;
            }
        }