Validate content of csv file c#

Question

I have a requirement where user will be uploading a csv file in the below format which will contain around 1.8 to 2 million records

SITE_ID,HOUSE,STREET,CITY         


        

Answer 1

Here is another way to accomplish your needs using Cinchoo ETL - an open source file helper library.

First define a POCO class with DataAnnonations validation attributes as below

public class Site
{
    [Required(ErrorMessage = "SiteID can't be null")]
    public int SiteID { get; set; }
    [Required]
    public int House { get; set; }
    [Required]
    public string Street { get; set; }
    [Required]
    [RegularExpression("^[a-zA-Z][a-zA-Z ]*$")]
    public string City { get; set; }
    [Required(ErrorMessage = "State is required")]
    [RegularExpression("^[A-Z][A-Z]$", ErrorMessage = "Incorrect zip code.")]
    public string State { get; set; }
    [Required]
    [RegularExpression("^[0-9][0-9]*$")]
    public string Zip { get; set; }
    public int Apartment { get; set; }
}

then use this class with ChoCSVReader to load and check the validity of the file using Validate()/IsValid() method as below

using (var p = new ChoCSVReader("*** YOUR CSV FILE PATH ***")
    .WithFirstLineHeader(true)
    )
{
    Exception ex;
    Console.WriteLine("IsValid: " + p.IsValid(out ex));
}

Hope it helps.

Disclaimer: I'm the author of this library.