public QueryOptions(
ISearchOptions searchOptions,
IEnumerable <ISortOptions> sortOptions,
IPaginationOptions paginationOptions)
{
SearchOptions = searchOptions;
SortOptions = sortOptions;
PaginationOptions = paginationOptions;
}
public static IPagedResult <TModel> GetPage <TModel>(this IQueryable <TModel> query,
IPaginationOptions paginationOptions)
{
var page = paginationOptions?.Page ?? 1;
var totalCount = query.Count();
var size = paginationOptions?.Size ?? totalCount;
var result = query.Skip((page - 1) * size).Take(size).ToList();
return(new PagedResult <TModel>(result, totalCount));
}
public static Uri GetPreviousPageUri <TParameters>(this IPaginationOptions <TParameters> pagination, Uri baseUri) where TParameters : class, IPagingParameters, ISortingParameters, new()
{
var previousPage = pagination.PreviousPage();
if (previousPage != null)
{
var ub = new UriBuilder(baseUri)
{
Query = QueryStringParser <TParameters> .Parse(previousPage).ToString()
};
return(ub.Uri);
}
return(baseUri);
}
public static Uri GetNextPageUri <TParameters>(this IPaginationOptions <TParameters> pagination, Uri baseUri) where TParameters : class, IPagingParameters, ISortingParameters, new()
{
var nextPage = pagination.NextPage();
if (nextPage != null)
{
var ub = new UriBuilder(baseUri)
{
Query = QueryStringParser <TParameters> .ToQueryString(nextPage)
};
return(ub.Uri);
}
return(baseUri);
}
public static Uri GetPageUri <TParameters>(this IPaginationOptions <TParameters> pagination, int page, Uri baseUri) where TParameters : class, IPagingParameters, ISortingParameters, new()
{
var parameters = pagination.ForPage(page);
if (parameters != null)
{
var ub = new UriBuilder(baseUri)
{
Query = QueryStringParser <TParameters> .ToQueryString(parameters)
};
return(ub.Uri);
}
return(baseUri);
}
public static IQueryable <TModel> ApplyOptions <TModel>(
this IQueryable <TModel> query,
IPaginationOptions options,
int maxItemsPerPage,
out IPaginationOptions appliedOptions)
where TModel : IQueryModel
{
if (options == null)
{
appliedOptions = null;
return(query.Take(maxItemsPerPage));
}
appliedOptions =
new PaginationOptions
{
ItemsPerPage = Math.Max(
Math.Min(options.ItemsPerPage, maxItemsPerPage), 1),
Page = Math.Max(options.Page, 1)
};
return(query.ApplyOptions(appliedOptions));
}
public static string SearchifyMvcSearchPreviousPage <TParameters>(this UrlHelper urlHelper, IPaginationOptions <TParameters> paginationOptions) where TParameters : Parameters, new()
{
var uri = paginationOptions.GetPreviousPageUri(new Uri($"http://tempuri.org{urlHelper.Action()}"));
return(uri.GetComponents(UriComponents.PathAndQuery, UriFormat.Unescaped));
}
private static IQueryable <TModel> ApplyOptions <TModel>(
this IQueryable <TModel> query, IPaginationOptions options)
where TModel : IQueryModel =>
query
.Skip((options.Page - 1) * options.ItemsPerPage)
.Take(options.ItemsPerPage);
