using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Collections; /// <summary>
/// Page helper, default page size = 10
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="entity"></typeparam>
public class LinqPageHelper<T, entity> where T : IEnumerable<entity>
{
T _collection;
int _pageCount;
int _pageSize;
public static readonly int defaultPageSize = ; /// <summary>
/// Capacity of a single page
/// </summary>
public int PageSize
{
get { return _pageSize; }
set
{
_pageSize = value;
onPageSizeChanged();
}
} /// <summary>
/// Total page count
/// </summary>
public int PageCount
{
get
{
return _pageCount;
}
set
{
_pageCount = value;
}
} /// <summary>
/// Total count
/// </summary>
public int Count
{
get { return _collection.Count(); }
} private LinqPageHelper()
{
} public LinqPageHelper(T t)
: this(t, defaultPageSize)
{ } public LinqPageHelper(T t, int pageSize)
{
_collection = t;
_pageSize = pageSize;
onPageSizeChanged();
} private void onPageSizeChanged()
{
_pageCount = (_collection.Count() - + _pageSize) / _pageSize;
} public IEnumerable<entity> Take(int currentPage)
{
if (currentPage <= || currentPage > PageCount)
{
return null;
} var query =
_collection.Take(_pageSize * currentPage).Skip(_pageSize * (currentPage - ));
return query;
} public bool IsLastPage(int currentPage)
{
return currentPage == _pageCount;
}
}
eg.
LinqPageHelper<IEnumerable<DataEntity>, DataEntity> helper =
new LinqPageHelper<IEnumerable<DataEntity>, DataEntity>(list);
helper.PageSize = pageSize;
var result = helper.Take(currentPage);