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Signum Framework Tutorials Part 2 – Southwind Logic

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15 Nov 2012LGPL325 min read 31.2K   1K   22  
In this part, we will focus on writing business logic, LINQ queries and explain inheritance
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Signum.Utilities
{
    /// <summary>
    /// 1-based index
    /// </summary>
    public class Page<T> 
    {
        public int StartElementIndex
        {
            get { return (ElementsPerPage * (CurrentPage - 1)) + 1; }
        }

        public int EndElementIndex
        {
            get { return StartElementIndex + Elements.Count; }
        }

        public int TotalElements { get; private set; }

        public int TotalPages
        {
            get { return (TotalElements + ElementsPerPage - 1) / ElementsPerPage; } //Round up
        }

        public int CurrentPage { get; private set; }
        public int ElementsPerPage { get; private set; }

        public List<T> Elements { get; private set; }

        public Page(int totalElements, int currentPage, int elementsPerPage, List<T> elements)
        {
            this.TotalElements = totalElements;
            this.CurrentPage = currentPage;
            this.ElementsPerPage = elementsPerPage;
            this.Elements = elements;
        }
    }

    public static class PageExtensions
    {
        public static Page<T> Paginate<T>(this IQueryable<T> source, int elementsPerPage, int currentPage)
        {
            var list = source.Skip((currentPage - 1) * elementsPerPage).Take(elementsPerPage).ToList();
            var count = source.Count();

            return new Page<T>(count, currentPage, elementsPerPage, list);
        }

        public static Page<T> Paginate<T>(this IEnumerable<T> source, int elementsPerPage, int currentPage)
        {
            var list = source.Skip((currentPage - 1) * elementsPerPage).Take(elementsPerPage).ToList();
            var count = source.Count();

            return new Page<T>(count, currentPage, elementsPerPage, list);
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)


Written By
Software Developer (Senior) Signum Software
Spain Spain
I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.

www.signumframework.com

I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...

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