如何在 C# 中拆分字符串并存储在数组中以及如何在特定字符串后添加新行

Question

`I want to read the info1.txt file and want to write in another text file info2.txt in this manner,

Id      Name     Address      DOB      Phone
1       abcd      efg      1/16/2021  987654323
2       hijkl     mno      2/16/2021  678987652

This is info1.txt

Id:1
Name:abcd
Address:efg
DOB:1/16/2021 3:31:22 PM
Phone:987654323

Id:2
Name:hijkl
Address:mno
DOB:2/16/2021 3:31:22 PM
Phone:678987652

And the info2.txt would be like above table format that I mentioned,also want to remove " 3:31:22 PM"

My Code

        static void Main(string[] args)
        {
            FileStream fsRead = new FileStream("E:\\Assignment\\info1.txt", FileMode.Open, FileAccess.Read);
            StreamReader srObj = new StreamReader(fsRead);
            FileStream fsWrite = new FileStream("E:\\Assignment\\info2.txt", FileMode.Create, FileAccess.Write);
            StreamWriter swObj = new StreamWriter(fsWrite);
           

            while (srObj.Peek() > 0)
            {
                string str;
                string[] strArray;
                
                str = srObj.ReadLine();
                str = str.Replace(" 3:31:22 PM", "");
                strArray = str.Split(':');

                
                    if (strArray.Length > 1)
                    {
                         swObj.Write(strArray[1]);
                         swObj.Write(" ");
                   
                     }
               }
swObj.Close();
                fsWrite.Close();
            srObj.Close();
            fsRead.Close();
           Console.ReadKey();
        }

Answer 1

I would parse the file into a list of dictionaries where each dictionary's keys are the columns.

First split the file lines into an array of strings. You can use File.ReadAllLines for that. Then send the array to this function that parses the lines.

public static List<Dictionary<string, string>> Parse(string [] lines)
{
    List<Dictionary<string, string>> data = new List<Dictionary<string, string>>();
    Dictionary<string, string> temp = new Dictionary<string, string>();
    foreach (var line in lines) {
        var parts = line.Split(new[] { ':' }, 2);
        if (parts.Length == 2) {
            temp[parts[0]] = parts[1];
        }
        else {
            if (temp.Count > 0) data.Add(temp);
            temp = new Dictionary<string, string>();
        }
    }
    if (temp.Count > 0) data.Add(temp);
    return data;
}

Then, make a function to write the list to a file.

public static void PrintTable(List<Dictionary<string, string>> users, TextWriter stream)
{
    if (users.Count == 0) return;
    
    // Print the header line
    foreach(var pair in users[0]) {
        stream.Write("{0,-12}", pair.Key);
    }
    stream.WriteLine();
    
    foreach (var user in users) {
        foreach(var pair in user) {
            // Special handling for DOB
            if (pair.Key == "DOB") stream.Write("{0,-12}", pair.Value.Split(' ')[0]);
            else stream.Write("{0,-12}", pair.Value);
        }
        stream.WriteLine();
    }
}