using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace System.Collections.Generic {
public interface IPagedList {
int TotalCount {
get;
set;
}
int CurrentPage {
get;
}
int NextPage {
get;
}
int LastPage {
get;
}
int TotalPages {
get;
set;
}
int PageIndex {
get;
set;
}
int PageSize {
get;
set;
}
bool HasPreviousPage {
get;
}
bool HasNextPage {
get;
}
bool IsCurrentPage(int pageNumber);
}
public class PagedList : List, IPagedList {
public PagedList(IQueryable source, int index, int pageSize) {
this.TotalCount = source.Count();
this.PageSize = pageSize;
this.PageIndex = index;
this.TotalPages = 1;
CalcPages();
this.AddRange(source.Skip(index * pageSize).Take(pageSize).ToList());
}
void CalcPages() {
if (PageSize > 0 && TotalCount > PageSize) {
TotalPages = TotalCount / PageSize;
if (TotalCount % PageSize > 0)
TotalPages++;
}
}
public int CurrentPage {
get {
return PageIndex + 1;
}
}
public int NextPage {
get {
return CurrentPage + 1;
}
}
public int LastPage {
get {
return CurrentPage - 1;
}
}
public int TotalCount {
get;
set;
}
public int TotalPages {
get;
set;
}
public int PageIndex {
get;
set;
}
public int PageSize {
get;
set;
}
public bool HasPreviousPage {
get {
return (PageIndex > 0);
}
}
public bool HasNextPage {
get {
return (PageIndex * PageSize) <= TotalCount;
}
}
public bool IsCurrentPage(int pageNumber) {
return pageNumber == CurrentPage;
}
}
public static class Pagination {
public static PagedList ToPagedList(this IQueryable source, int index, int pageSize) {
return new PagedList(source, index, pageSize);
}
public static PagedList ToPagedList(this IQueryable source, int index) {
return new PagedList(source, index, 10);
}
}
}