如何在C#中读取和编辑.txt文件？

Question

例如,我有一个txt文件,内容如下:

12 345 45
2342 234 45 2 2 45345
234 546 34 3 45 65 765
12 23 434 34 56 76 5

我想在所有数字之间插入一个逗号,在每行的开头添加左括号,在每行的末尾添加右括号.所以在编辑之后它应该是:

{12, 345, 45}
{2342, 234, 45, 2, 2, 45345}
{234, 546, 34, 3, 45, 65, 765}
{12, 23, 434, 34, 56, 76, 5}

我该怎么做？

Answer 1

添加了一些LINQ以获得乐趣和利润(优化空间;)):

System.IO.File.WriteAllLines(
    "outfilename.txt",
    System.IO.File.ReadAllLines("infilename.txt").Select(line =>
        "{" +
        string.Join(", ",
            line.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)
        ) + "}"
    ).ToArray()
);

Answer 2

像这样:(未测试)

string filename = @"c:\yourfilename.txt";
StringBuilder result = new StringBuilder();

            if (System.IO.File.Exists(filename))
            {
                using (StreamReader streamReader = new StreamReader(filename))
                {
                    String line;
                    while ((line = streamReader.ReadLine()) != null)
                    {
                        string newLine = String.Concat("{", line, "}", Environment.NewLine);
                        newLine = newLine.Replace(" ", ", ");
                        result.Append(newLine);
                    }
                }
            }

using (FileStream fileStream = new FileStream(filename , fileMode, fileAccess))
            {
                StreamWriter streamWriter = new StreamWriter(fileStream);
                streamWriter.Write(result);
                streamWriter.Close();
                fileStream.Close();
            }

Answer 3

你应该首先处理逻辑,而不是直接要求人们为你提供.至于读/写文件,你去:

//write      
FileStream fs = new FileStream("file_name", FileMode.Create);
StreamWriter w = new StreamWriter(fs, Encoding.UTF8);
w.WriteLine("text_to_write");
w.Flush();
w.Close();
fs.Close();

//read
fs = new FileStream("file_name", FileMode.Open);
StreamReader r = new StreamReader(fs, Encoding.UTF8);
Console.WriteLine(r.ReadLine());
r.Close();
fs.Close();