Read and write the text file

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Hi ,

Please provide me advise on below task.

C# Program to Execute given text file into output text file

Input.txt

Col1 Col2
Id1 Val1
Id2 Val2
Id3 Val3
1d1 Val4
Id4 Val5
Id2 Val6
Idn

ouput.txt

Col1 Col2
Id1 Val1;val4
Id2 Val2;val6
Id3 Val3
Id4 Val5

Posted 27-Nov-14 23:35pm

vishnukamath

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CHill60 28-Nov-14 5:46am

We don't do your homework for you. How would you learn if we did? Give a try, it's not hard, then come back if you have a specific problem

3 solutions

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Marcin Kozub · Answer 1 · 2014-11-27T23:49:00

Hi,

Try this:

C#

// For store input data;
var data = new Dictionary<string, List<string>>();

// Load data from file
using (var streamReader = new StreamReader(@"D:\input.txt"))
{
    while(!streamReader.EndOfStream)
    {
        var line = streamReader.ReadLine();
        var items = line.Split(" ".ToCharArray());
        var id = items[0];
        var value = items[1];
        if (!data.ContainsKey(id))
        {
            data.Add(id, new List<string>());
        }
        data[id].Add(value);
    }
}

// Sava file
using (var streamWriter = new StreamWriter(@"D:\output.txt"))
{
    foreach (var key in data.Keys)
    {
        var values = string.Join(";", data[key]);
        streamWriter.WriteLine(string.Format("{0} {1}", key, values));
    }
}

Some links for education:
http://msdn.microsoft.com/en-us/library/vstudio/system.io.streamreader%28v=vs.90%29[^]
http://msdn.microsoft.com/en-us/library/vstudio/system.io.streamwriter%28v=vs.90%29[^]
http://msdn.microsoft.com/en-us/library/vstudio/xfhwa508%28v=vs.100%29.aspx[^]
http://msdn.microsoft.com/en-us/library/system.collections%28v=vs.110%29.aspx[^]

Cheers!

Er. Dinesh Sharma · Answer 2 · 2014-11-28T00:10:00

Hi Please try this

C#

string[] lines = System.IO.File.ReadAllLines(@"E:\Test\Input.txt");

            var r = from x in lines.Select(x => x.Split('\t')).OrderBy(x=>x[0])
                    group x by x[0] into p
                    select p;
            string Value = string.Empty;
            string Key = string.Empty;
            
            using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"E:\Test\Output.txt"))
            {
            foreach (var n in r)
            {
                Console.WriteLine(n.Key);
                Key = n.Key;
                foreach (var l in n)
                {
                    Value = Value + l[1] + ";";
                }
                file.WriteLine(Key + " " + Value);

                Value = "";
            }
            }

vishnukamath · Answer 3 · 2014-11-28T04:24:00

Hi ,

I found one solution . Please find the below code.

C#

string[] lines = System.IO.File.ReadAllLines(@"input.txt");
            string fnString = "", keyStr = "";
            ArrayList arLst = new ArrayList();
            arLst.Add("Col1 Col2");
            for (int i = 1; i < lines.Count(); i++)
            {
                fnString = ""; keyStr = "";
                if (lines[i].Trim() != "")
                {
                    string[] arrRow = lines[i].Split(' ');
                    for (int j = 1; j < lines.Count(); j++)
                    {
                        if (lines[j].Trim() != "")
                        {
                            string[] arrRow1 = lines[j].Split(' ');
                            keyStr = arrRow[0];
                            if (arrRow[0].Equals(arrRow1[0]))
                            {
                                fnString += arrRow1[1] + ";";
                                lines[j] = "";
                            }
                        }
                    }
                    if (fnString.EndsWith(";"))
                        fnString = fnString.Substring(0, fnString.Length - 1);
                    arLst.Add(keyStr + ' ' + fnString);
                }
            }
            using (var streamWriter = new StreamWriter(@"output.txt"))
            {
                for (int i = 0; i < arLst.Count; i++)
                {
                    streamWriter.WriteLine(arLst[i]);
                }
                streamWriter.Close();
            }

Read and write the text file

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