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Hectorepg
Asked: 2022-09-15 11:16:35 +0800 CST 2022-09-15 11:16:35 +0800 CST

Iterate day by day

  • 772

I am trying to iterate in a range of dates, I get everything correct if I enter from a month below to the current one:

Example from 08-1-2022 to 09-14-2022, for that use the following code:

    DateTime Fecini = new DateTime(2022, 8, 1);
    DateTime FecFinal = new DateTime(2022, 9, 14);
    System.TimeSpan dif = FecFinal - Fecini;
    DateTime FecSec;//fecha seleccionad en el bucle
    for (int n = 0; n <=dif.Days; n++)
    {
        FecSec = Fecini.AddDays(n);
        Console.WriteLine(FecSec);
    }

It prints correctly, but what I want is for it to be from today to last month (09-14-2022 to 08-01-2022), I use the following code but the problem is that it does not stop on the 1st of the month August, continues and continues to print more dates.

I hope you can support me with it or support me where my mistake is to correct it.

        DateTime Fecini = new DateTime(2022, 9, 14);
        DateTime FecFinal = new DateTime(2022, 8, 1);
        System.TimeSpan dif = Fecini - FecFinal;
        DateTime FecSec;
        for (int n = 0; n <= dif.Days; n--)
        {
            FecSec = Fecini.AddDays(n);
            Console.WriteLine(FecSec);
        }
c#

2 Answers

  1. Best Answer

    Sometimes you forget that a for can iterate over elements other than an integer. It seems more readable to me to do it as follows:

    DateTime Fecini = new DateTime(2022, 8, 1);
DateTime FecFinal = new DateTime(2022, 9, 14);

for (DateTime f = Fecini ; f <= FecFinal ; f = f.AddDays(1))
{
   Console.WriteLine(f.ToString());
}

    In reverse order:

    for (DateTime f = FecFinal; f >= Fecini; f = f.AddDays(-1))
{
   Console.WriteLine(f.ToString());
}
    • 1

  2. Try like this:

    I was telling you negatives, that's why the condition was never met n <= dif.Daysand nit was always going to be less

        for (int n = 0; n <= dif.Days; n++)//Aquí se incrementa la n
    {
        FecSec = Fecini.AddDays(-n);// y aquí se decrementa n
        Console.WriteLine(FecSec);
    }
    • 0