C# read a csv file into an array

I would really like it if someone helped. Also this code is going to be performed by a bot when a certain phrase is given as input by the user. You have a file with columnar data with numbers and its commma separated. Implement logic to archive the data in such a way that you would save the most size. There should be no data loss. Everything that is archived must be able to be extracted eventually. You could squeeze a little more space out of it if you then compress it into a zip file.

See this post on the C Helper site:. Compress and decompress directories in C. How to: Compress and extract files. Hello sir, can you help me about that. You should be able to use this example to red the CSV data into an array. Then use a loop to loop through the rows of the array and call your method for the values in the rows.

It will probably look something like this:. Hello Sir, Greetings! Can you help me on that? This example shows how you can read a CSV file into an array. The example below shows how to download a file from the internet. Download files from the web in C. This example should do that. Just change the delimiter from a comma to a semi-colon in this statement:. Sir I want to display my CSV file data in the console column wise, as to when I code a certain column name it should display only those column values in the C console, please help.

You should be able to use this example to read the data into an array. Then you can loop through the array and display the data in the console window. You can search the header row for the column that you want to display. After you know its index, you can display only that column if you like.

Or if you want to avoid loading all of the data, process the first row to find the named column. Then process each row and only display the required column. Hi Rod! Thank you for sharing this useful snippet of code. It saved a lot of hours of code for me.

I had adopted the code to read data from CSV, load into 2D array and with the manipulation of array to populate a specific column from an excel spreadsheet. The code:. I am using the LoadCsv method to read a csv file into a 2 dimensional array.

In another method I am creating a workbook that is loading a worksheet data from an excel file. I want to fill a column from that worksheet second method with specific data from 2 different columns from the csv file. The worksheet that is loaded from the.

Therefore I am creating ranges to capture each table. And after I use the above mentioned nested loop to populate the column that I need. The issue is that is only populating a cell and it should populate 4 The ItemNo column that is in both files is has 4 records to be populated in the worksheet. My guess is that I am not setting the right indexes to iterate through. The code in the inner loop only looks at specific columns. If I were to display these array values intro a dropdown instead of the data grid, how to go about it?

In C you would use a ComboBox to make a dropdown list. Add one to your form at design time. Suppose you call it cboValues. Notice that the cboValues. Add statement is using all rows and column number 0.

If you want to change the column number, just change the 0 to that number. Sorry, found the missing part. You need to download the example to see all of the details. For your example, you probably need to use LoadCsv [filename] where [filename] is the name of your file. Hi Sir, I am fairly new to C. For your example, how to write data from a 2D String Array to a csv file? Any help or advice greatly appreciated. C Helper. Skip to content. Split ','. Rows[r - 1].

This entry was posted in files , strings and tagged C , C programming , comma-separated-value , comma-separated-value file , csv file , example , example program , files , read csv file , read file , strings , Windows Forms programming. Bookmark the permalink. November 15, at am. Rod Stephens says:. November 15, at pm. The problem is in the code that displays the values. Thanks for pointing this out! Cartoons says:. March 26, at pm. Adrian says:. November 26, at am. Habeeb says:.

November 19, at am. Below is a sample code: using Microsoft. ReadLine ; while! Alexey says:. July 8, at am. RodStephens says:. I never said this could read a 50 MB file. Sandhya R says:. December 4, at am. December 6, at pm. December 7, at am. Sir, as a beginner i find your code to be complex. This is my code, it prints the numbers in a particular column from. ReadLine ; how can i alter this code to convert the string in each column to a number and store them all in a 2D array.

Sorry but, yes, some of the examples assume you have some previous experience. January 12, at am. RemoveEmptyEntries ; Should remove any lines that are completely empty.

All in all, quite a bit of extra work. January 15, at am. This example reads the values as strings. You can either: 1. Write another method that converts the array of strings into an array of integers 2. January 16, at am. DWalker07 says:. January 28, at am. March 2, at am. Great Blog!!!! March 2, at pm.

Joe Pallagi says:. December 9, at am. December 9, at pm. December 28, at pm. December 29, at am. December 29, at pm. December 30, at pm. December 31, at am. January 1, at pm. January 10, at pm. Please how can you show a 3 dimensional array in a DataGridView. January 11, at pm. See this post: Display master-detail data in a DataGrid in C. January 13, at pm. January 15, at pm. Or I still think you could use master-detail in a DataGrid. January 18, at am. January 19, at am. There are two basic approaches: arrays or lists.

For arrays you need to initialize each of the entries separately. Sorry but both approaches are kind of confusing. Really appreciated.

Good man. January 19, at pm. You could also write code to verify that values are within an allowed range. February 14, at am. February 14, at pm. February 15, at am. February 15, at pm. I am referring to the combox example. You should try to follow the suggestions in the reply: Decide what kind of database you want to use. March 31, at am. Add food[0] ; foods. Add food[1] ; foods. Name, food[ii]. March 31, at pm.

April 1, at am. Many thanks, I have already implemented what you suggested but the result is still the same. April 1, at pm. April 5, at am. Hello sir, Please how do I send the output to an excel file? April 5, at pm. April 20, at pm. April 21, at pm. April 23, at pm. April 24, at am. April 26, at pm. Please how do create a class diagram from the Food project. April 27, at am. May 1, at am. Thank you for your immense help. May 1, at pm.

CSVs etc all manipulations of. May 2, at am. You could put that method in the Food class or not. May 6, at pm. May 7, at pm.

May 10, at am. You can download it here: Visual Studio Community. May 11, at am. How your code wrapper works will depend on what you want to wrap. May 12, at am. May 13, at am. May 14, at pm. May 19, at am. May 20, at am. May 22, at pm. May 24, at am. Probably you should assume both will work and then decide based on the features that you want. May 31, at am. I really appreciate. You have been very helpful. Omar says:. June 4, at am. June 15, at pm. Hi, I there is numbers like 10, There are several ways you can handle this.

Use some other delimiter such as a tab instead of a comma. Remove the commas from the numbers. Enclose the values that contain commas with quotes.

Excel does that if you save a file into a CSV file. Then you need to parse the file properly. June 14, at pm. Please how do i do a shallow copy of a class with only some members?

MailingAaddress Now the two Person objects share this address so changes to one also change the other. June 16, at am. June 17, at am. July 3, at am. The TextFieldParser is defined in Microsoft. FileIO library. ReadLine ; Example Code: using System. IO; using System. Split ';' ; listA. Add values[0] ; listB.

And there are so many dialects with different quoting or escaping rules in practice that you can't really talk of a standard even if in theory there is a RFC. For all of the answers that simply split the string on the delimiter character, this is not the best way to go. There are more rules to the CSV format that this will not cover. It is best to use a 3rd party parser. More info- dotnetcoretutorials. Add a comment. Active Oldest Votes. You can do it like this: using System.

Split ';' ; listA. Add values[0] ; listB. Improve this answer. Michael M. Thanks for this, I had forgotten how to split lines in a csv file dumb me! It's over 3 years later and this question is still helping someone.

I feel bad that you didn't get an accept on this. Does not handle field values with commas, etc. Should use a using clause here, or at the very least manually Close the reader as it's an IDisposible resource. This also will not properly parse a CSV written like column1;"Special ; char in string";column3 - tools. Show 6 more comments.

Below is a sample code: using Microsoft. ReadLine ; while! Habeeb Habeeb 6, 1 1 gold badge 27 27 silver badges 30 30 bronze badges. I like this option the best. I don't have to worry about escape characters since the class is a CSV parser and not something being built manually. In case anyone runs into this and is wondering, you'll need to include the reference to Microsoft. VisualBasic framework assembly as it is not typically referenced by default.

I wish I had remembered this from my VB6 days, would have saved me a lot of time over the years. This has A LOT of value. This solution is a homerun. Why only in VB dll? Show 1 more comment.

ReadAllLines "test. Split ','. ToArray ;. Jonas NET 1. Clay Shannon-B. Crow Raven. I also want to point out that csv's can be quoted So using string. Split isn't a viable option. I am getting: 'System. Array' does not contain a definition for 'Split' and no extension method 'Split' accepting a first argument of type 'System. Array' could be found are you missing a using directive or an assembly reference? You are getting System. Array doesnt contain a definition because lines is an IEnumerable string [] so line is basically a string array that has one element.

ToArray ; — Zein Sleiman. Show 4 more comments. Andrew Truckle 15k 13 13 gold badges 52 52 silver badges bronze badges. This is the best answer! Robust library that's easy to drop in and roll with. The CsvHelper library is fantastic. Super quick and easy to use. If you are looking for a library that can deal with every aspect of the csv format including quoted strings, use this one. Thx, really nice library, easy to use and very robust.

How does the performance compare to Microsoft. TextFieldParser cf. Habeeb's answer? Split ';' ; column1. Add splits[0] ; column2. WriteLine "Column 1:" ; foreach var element in column1 Console. WriteLine "Column 2:" ; foreach var element in column2 Console. WriteLine element ; N. Does not account for ; being a part of the value, example "value with ; inside it". CSV surround values containing special characters with with double quotes to say it is a literal string. ChickenFeet: sure, that's the reason of the caption : "Very simple example".

Anyway I can add a note about that ; — digEmAll. No worries, I noticed a lot of other answers here also do not account for it : — ChickenFeet. Split sr.

ReadLine , ",? Paul Paul 34k 9 9 gold badges 84 84 silver badges bronze badges. If you're in a business situation and need to get cracking use this.

This parser is available in the Nuget gallery as LumenWorks. IO, in case you don't want to register for CodeProject to download it. ReadAllText filename. Skip headerRows. How do you access the rows and columns in the csv variable?

Does not handle commas within columns.