Question

我正在处理这个问题，无法让我的输出文件显示输入文件中按字母顺序排列的整个字符串。

我的输入文件是:(三行之间没有间距）

eafcd

FGHIJ

LK

输出文件是:(三行之间没有间距）

FGHIJ

LK

我认为问题出现在我的字母顺序排列方法中，但我似乎无法弄清楚为什么某些字符没有出现在输出文件中。

感谢您的帮助！

使用System; 使用System.IO;

命名空间TestFileIO { class fileFileIO { private static string foo;

    static void Main(string[] args)
    {
        StreamWriter writer = null;

        writer = new StreamWriter(@"C:\Files\OutputWrite2.txt");
        Console.SetOut(writer);

        Console.SetIn(new StreamReader(@"C:\Files\InputRead2.txt"));
        string letters = Console.ReadLine();

        foo = alphabetize(letters);

        string line = foo;
        while ((line = Console.ReadLine()) != null)
        {
            string newLine = line; 
            Console.WriteLine(newLine);
        }
        writer.Close();

        StreamWriter standardOutput = new StreamWriter(Console.OpenStandardOutput());
        standardOutput.AutoFlush = true;
        Console.SetOut(standardOutput);

        Console.WriteLine("Alphabetized all characters in requested file and wrote to output file.");

    }
    public static string alphabetize(string letters)
    {
        char[] line = letters.ToCharArray();
        Array.Sort<char>(line);
        return new string(line);
    }
}

}

Answer 1

while ((line = Console.ReadLine()) != null)
    {
        string newLine = line; 
        Console.WriteLine(newLine);
    }

while条件中的Console.ReadLine（）正在覆盖'line'变量的内容。这就是你错过输入文件第一行

的原因

以下代码应满足您的要求。

        static void Main(string[] args)
    {
        StreamWriter writer = null;

        writer = new StreamWriter(@"D:\OutputWrite2.txt");
        Console.SetOut(writer);

        Console.SetIn(new StreamReader(@"D:\InputRead2.txt"));
        string letters = Console.ReadLine();
        while (letters != null)
        {
            var foo = alphabetize(letters);
            string line = foo;
            string newLine = line;
            Console.WriteLine(newLine);
            letters = Console.ReadLine();
        }
        writer.Close();

        StreamWriter standardOutput = new StreamWriter(Console.OpenStandardOutput());
        standardOutput.AutoFlush = true;
        Console.SetOut(standardOutput);

        Console.WriteLine("Alphabetized all characters in requested file and wrote to output file.");

    }
    public static string alphabetize(string letters)
    {
        char[] line = letters.ToCharArray();
        Array.Sort<char>(line);
        return new string(line);
    }

将字符串转换为数组，按字母顺序排列，然后转换回字符串

1 个答案: