How to read from csv file using c#

Question

0.00/5 (No votes)

See more:

Hi,

I am developing mobile application using c#.net and want to read from csv file. I have written a code as below but still not getting the individual values.

C#

private void readtext()
        {
            var reader = new StreamReader(File.OpenRead("\\Application\\Master.csv"));
            var  listA = new List<String>();
            var  listB = new List<String>();
            var  listC = new List<String>();
            var  listD = new List<String>();
            string vara1, vara2, vara3, vara4;
            while (!reader.EndOfStream)
            {
                var line = reader.ReadLine();
                var values = line.Split(',');

                listA.Add(values[0]);
                listB.Add(values[1]);
                listC.Add(values[2]);
                listD.Add(values[3]);
            }
            var firstlistA = listA.ToArray();
            var firstlistB = listB.ToArray();
            var firstlistC = listC.ToArray();
            var firstlistD = listD.ToArray();
        }

Can anyone help me

Posted 14-May-12 0:07am

Saumyavemula

Updated 18-May-18 0:00am

Manas Bhardwaj

v3

Add a Solution

Comments

Manas Bhardwaj 14-May-12 6:11am

Depends more on the data you have in csv. Did you try to debug?

sjelen 14-May-12 6:11am

I don't see a problem here. Can you provide a sample of csv file? A bit more details on the problem?

Saumyavemula 14-May-12 6:41am

The problem is I am getting the value of firstlistA as 'String[9]' but I want the value which is in my CSV file

3 solutions

Solution 3

You can use LiNQ[^] to read delimited files:
Using LINQ to read delimited text files[^]
LINQ to CSV library[^]
tutorial-reading-a-text-file-using-linq[^]

Posted 14-May-12 1:24am

Maciej Los

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2012-05-14T00:19:00

With a couple of error checks in place, it works for me on a test CSV file:

C#

{
StreamReader reader = new StreamReader(File.OpenRead(@"D:\Temp\ContactsShort.csv"));
List<string> listA = new List<String>();
List<string> listB = new List<String>();
List<string> listC = new List<String>();
List<string> listD = new List<String>();
//string vara1, vara2, vara3, vara4;
while (!reader.EndOfStream)
    {
    string line = reader.ReadLine();
    if (!String.IsNullOrWhiteSpace(line))
        {
        string[] values = line.Split(',');
        if (values.Length >= 4)
            {
            listA.Add(values[0]);
            listB.Add(values[1]);
            listC.Add(values[2]);
            listD.Add(values[3]);
            }
        }
    }
string[] firstlistA = listA.ToArray();
string[] firstlistB = listB.ToArray();
string[] firstlistC = listC.ToArray();
string[] firstlistD = listD.ToArray();
}

So, I would start looking at your CSV file, and at the output you actually get.

BTW: Don't use var as a declaration all the time - it just shows you are too lazy to think about your datatypes. Particularly as Intellisense will fill out the right hand side for you in most case if you do the left...

Prasad_Kulkarni · Accepted Answer · 2012-05-14T00:21:00

Try this:

C#

Using System.IO;

StreamReader sr = new StreamReader(@"file.csv");
// for set encoding
// StreamReader sr = new StreamReader(@"file.csv", Encoding.GetEncoding(1250));

string strline = "";
string[] _values = null;
int x = 0;
while (!sr.EndOfStream)
{
    x++;
    strline = sr.ReadLine();
    _values = strline.Split(';');
    if (_values.Length >= 6 && _values[0].Trim().Length>0)
    {
      MessageBox.show(_values[1]);
    }
}
sr.Close();

also refer some threads:

A Fast CSV Reader[^]

Building a Simple CSV Parser in C#[^]
C#.NET- Reading CSV file[^]

How to read from csv file using c#

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0