How do I delete multiple rows in csv file by dates

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C#

private void button2_Click(object sender, EventArgs e)
      {
        DateTime start = new DateTime(01 / 25 / 2015);
        DateTime end = new DateTime(01 / 27 / 2015);
     
        var dates = new List<datetime>();
    
        for (var dt = start; dt <= end; dt = dt.AddDays(1))
        {
          dates.Add(dt);
    
          var oldLines = System.IO.File.ReadAllLines(txtFileName.Text);
          var newLines = oldLines.Where(line => 
          line.Contains(dates.ToString()));          
          System.IO.File.WriteAllLines(txtFileName.Text, newLines);
    
          newLines = oldLines.Select(line => new
    
            {
                Line = line,
                Words = line.Split(' ')
            })
             .Where(lineInfo => lineInfo.Words.Contains(dates.ToString()))
             .Select(lineInfo => lineInfo.Line);
         }
      }

After browsing the file from directory.
SAMPLE INPUT:

"EmployeeCode","Date","Time","Type"
"3434","01/22/2013","07:54","0"
"3023","01/23/2014","07:54","0"
"2897","01/24/2015","07:54","0"
"3734","01/25/2015","07:54","0"
"3168","01/26/2015","07:54","0"
"4863","01/26/2015","07:55","0"
"2513","01/27/2015","07:55","0"
"2582","01/27/2015","07:55","0"

OUTPUT:

"EmployeeCode","Date","Time","Type"
"3734","01/25/2015","07:54","0"
"3168","01/26/2015","07:54","0"
"4863","01/26/2015","07:55","0"
"2513","01/27/2015","07:55","0"
"2582","01/27/2015","07:55","0"

Suggestions, comments, sharing codes and ideas are highly appreciated.

What I have tried:

To pursue my goal of deleting multiple lines in csv file. My idea is to get the dates between two dates that are not include for deletion. But how can I iterate days between two dates and get there values to string and used to my code for evaluating the csv file that contains this field.

Posted 16-Jun-17 22:03pm

Member 13264296

Updated 30-Jun-17 10:58am

v4

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Comments

Maciej Los 17-Jun-17 4:18am

What is exact input? Seems, you want to split data by [" "] (space), but the example data you posted is delimited by comma [","].

Member 13264296 17-Jun-17 4:29am

It's fine, there's no problem by that issue, it will just overwritten with empty string. My problem is how can I iterate days between two dates including months,days and year, then the values will insert to this code .Contains("date values here").

Maciej Los 17-Jun-17 4:40am

Check my solution.

2 solutions

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RickZeeland · Answer 1 · 2017-06-16T22:25:00

I think your DateTime statement is wrong and should look like this:

C#

DateTime start = new DateTime(2015, 1, 25);
Console.WriteLine("Date = " + start);
Console.WriteLine("Date = " + start.ToShortDateString());

Will give:
Date = 1/25/2015 12:00:00 AM
Date = 1/25/2015

Updated Example:

C#

using System;
using System.Linq;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		DateTime start = new DateTime(2015, 1, 25);
		DateTime end = new DateTime(2015, 1, 27);
		
		var dates = new List<DateTime>();
		var oldLines = new List<string> { "01/25/2015", "01/26/2015", "01/27/2015", "01/28/2015" };
		var newLines = new List<string>();
		
		for (var dt = start; dt <= end; dt = dt.AddDays(1))
        {
        	dates.Add(dt);
		}
		
		foreach(var d in dates)
		{
			newLines.AddRange(oldLines.Where(line => line.Contains(d.ToShortDateString())));
		}
		
		Console.WriteLine(newLines.Count());
	}
}

Maciej Los · Answer 2 · 2017-06-16T22:38:00

~~Assuming that data are delimited by space...~~

Assuming that data are arounded by double quote and delimited by comma...

C#

string[] lines = {@"""EmployeeCode"",""Date"",""Time"",""Type""",
	@"""3434"",""01/22/2013"",""07:54"",""0""",
	@"""3023"",""01/23/2014"",""07:54"",""0""",
	@"""2897"",""01/24/2015"",""07:54"",""0""",
	@"""3734"",""01/25/2015"",""07:54"",""0""",
	@"""3168"",""01/26/2015"",""07:54"",""0""",
	@"""4863"",""01/26/2015"",""07:55"",""0""",
	@"""2513"",""01/27/2015"",""07:55"",""0""",
	@"""2582"",""01/27/2015"",""07:55"",""0"""};

DateTime dFm  = new DateTime(2015, 1, 25);
DateTime dTo  = new DateTime(2015, 1, 27);

var data = lines
	.Skip(1)
	.Select(x=> new
	{
		EmpCode = Int32.Parse(x.Split(new string[]{@""",""", @""""}, StringSplitOptions.RemoveEmptyEntries)[0]),
		Date = DateTime.ParseExact(
			string.Concat(x.Split(new string[]{@""",""", @""""}, StringSplitOptions.RemoveEmptyEntries)[1], " ",
				x.Split(new string[]{@""",""", @""""}, StringSplitOptions.RemoveEmptyEntries)[2]),
			"MM/dd/yyyy HH:mm", System.Globalization.CultureInfo.InvariantCulture),
		Type = x.Split(new string[]{@""",""", @""""}, StringSplitOptions.RemoveEmptyEntries)[3]
	})
	.Where(x=>x.Date>=dFm && x.Date<=dTo)
	.ToList();

Result:

3734 2015-01-25 07:54:00 0 
3168 2015-01-26 07:54:00 0 
4863 2015-01-26 07:55:00 0

Good luck!

How do I delete multiple rows in csv file by dates

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