/// <summary>
/// fetch part of the queryable data and build pagination data for view to render pagination links
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
/// <param name="page">current page number</param>
/// <param name="pageSize">item per page</param>
/// <param name="viewData">used for store pagination data, which for view to render pagination links</param>
/// <returns></returns>
public static IQueryable <T> Paginate <T>(this IQueryable <T> list, int page, int pageSize, ViewDataDictionary viewData)
{
viewData["_PaginationData"] = PaginationData.Build(
new PaginationOption
{
TotalCount = list.Count(),
Page = page,
PageSize = pageSize,
NextText = Strings.next,
PreviousText = Strings.previous
});
return(list.Skip((page - 1) * pageSize).Take(pageSize));
}
public static PaginationData Build(PaginationOption option)
{
PaginationData result = new PaginationData();
result.TotalCount = option.TotalCount;
result.CurrentPage = option.Page;
int page = option.Page;
result.TotalPages = (int)Math.Ceiling(option.TotalCount / (double)(option.PageSize ?? _pageSize));
result.PreviousLink = new PaginationLink {
Text = option.PreviousText ?? _previousText, Page = page - 1, IsLink = page != 1, HtmlClass = option.HtmlClass ?? _htmlClass
};
result.NextLink = new PaginationLink {
Text = option.NextText ?? _nextText, Page = page + 1, IsLink = page != result.TotalPages, HtmlClass = option.HtmlClass ?? _htmlClass
};
return(result);
}
/// <summary>
/// render pagination links (assume that there is PaginationData stored in ViewData)
/// </summary>
/// <param name="helper"></param>
/// <returns></returns>
public static string Paginate(this HtmlHelper helper)
{
string actionName = helper.ViewContext.RouteData.Values["action"].ToString();
PaginationData paginationData = helper.ViewData["_PaginationData"] as PaginationData;
if (paginationData == null)
{
return("no pagination data");
}
StringBuilder output = new StringBuilder();
output.Append(helper.NavigationTag(paginationData.PreviousLink, actionName));
output.Append(" ");
output.Append(helper.NavigationTag(paginationData.NextLink, actionName));
return(output.ToString());
}