Displaying page numbers

Question

I'd like to mimic how this paging works:

Notice how the current page will always show two pages on either side? This seems like it would be a lot of conditional code when you factor in the case that you may be on page 4 and there is no gap between 1 and 3 or if you are on page 1 it will show more than two numbers to the right.

Can somebody get me off to the right start?

Answer 1

Here's sample output from console program with logic you are looking for:

Program.exe 1

1 2 3...100

Program.exe 2

1 2 3 4...100

Program.exe 5

1...3 4 5 6 7...100

using System;

class Program
{
    static void Main(string[] args)
    {
        // usage program.exe page#
        // page# between 1 and 100
        int minPage = 1;
        int maxPage = 100;
        int currentPage = int.Parse(args[0]);

        // output nice pagination
        // always have a group of 5

        int minRange = Math.Max(minPage, currentPage-2);
        int maxRange = Math.Min(maxPage, currentPage+2);

        if (minRange != minPage)
        {
            Console.Write(minPage);
            Console.Write("...");
        }

        for (int i = minRange; i <= maxRange; i++)
        {
            Console.Write(i);
            if (i != maxRange) Console.Write(" ");
        }

        if (maxRange != maxPage)
        {
            Console.Write("...");
            Console.Write(maxPage);
        }
    }
}