从 .txt 文件读取双打并将它们复制到新的 .txt 文件 (Streamreader/Streamwriter)

Question

static void Main(string[] args)
    {
        Console.Write("Enter the name of the file to open: ");
        string input = Console.ReadLine();
        Console.Write("Enter the name of the output file: ");
        string output = Console.ReadLine();
        var InFile = new StreamReader(input);
        int TotalD = 0;
        StreamWriter OutFile = new StreamWriter(output);
        Console.WriteLine();
        try
        {
            using (InFile)
            {
                double DInput = 0;
                while (DInput == double.Parse(InFile.ReadLine()))
                {
                    while (!InFile.EndOfStream)
                    {
                        DInput = double.Parse(InFile.ReadLine());
                        double DOutput = DInput * 2;
                        InFile.Close();

                        using (OutFile)
                        {
                            OutFile.WriteLine(DOutput);
                        }

                    }
                    InFile.Close();

                }
            }
            using (StreamReader r = new StreamReader(input))
            {
                TotalD = 0; 
                while (r.ReadLine() != null) { TotalD++; }

            }
        }
        catch (IOException Except)
        {
            Console.WriteLine(Except.Message);
        }
        Console.WriteLine("There were {0} doubles copied to {1}.", TotalD, output);
        Console.WriteLine();
        Console.Write("Press <enter> to exit the program: ");
        Console.Read();
    }

好的，所以我之前问过这个问题，但问题是我不知道 input.txt 文件必须手动编写，而不是像以前那样生成。当前版本也可以在没有错误消息的情况下运行。现在唯一的问题是 output.txt 完全空白。任何帮助将不胜感激！

这个项目的想法是阅读 input.txt:

的双打

1.5
2.3
3
4.7
5

并将它们写入 output.txt 仅次 2:

3.0
4.6
6
9.4
10

Answer 1

 string input = @"C:\temp\testinput.txt";
 string output = @"C:\temp\testoutput.txt";
 using (var reader = new StreamReader(input))
 {
     using (var writer = new StreamWriter(output))
     {
         var line = reader.ReadLine();
         while (line != null)
         {
             var value = float.Parse(line);
             var result = value * 2;
             writer.WriteLine(result);
             line = reader.ReadLine();
         }
     }                
 }

将输出格式化为您想要的格式。

从 .txt 文件读取双打并将它们复制到新的 .txt 文件 (Streamreader/Streamwriter)

Reading doubles from a .txt file and copying them to a new .txt file (Streamreader/Streamwriter)

c#

streamwriter

streamreader