private string GetPageLink(IAuthorParameters parameters, int pageNumber)
{
return(Url.Link(
"GetAuthors",
new
{
pageNumber,
fields = parameters.Fields,
pageSize = parameters.PageSize,
mainCategory = parameters.MainCategory,
searchQuery = parameters.SearchQuery
}));
}
private string GetPaginationData(PagedList <AuthorDto> pagedList, IAuthorParameters parameters, int totalCount)
{
var totalPages = Math.Ceiling(totalCount / (double)parameters.PageSize);
var previousPageLink =
parameters.PageNumber == 1 ? null : GetPageLink(parameters, parameters.PageNumber - 1);
var nextPageLink = totalPages > parameters.PageNumber
? GetPageLink(parameters, parameters.PageNumber + 1)
: null;
var paginationMetadata = new
{
pageSize = pagedList.PageSize,
pageNumber = pagedList.CurrentPage,
totalPages,
totalCount,
previousPageLink,
nextPageLink
};
return(JsonConvert.SerializeObject(paginationMetadata));
}
public IEnumerable <Author> GetAuthors(IAuthorParameters authorParameters, out int totalCount)
{
if (authorParameters == null)
{
throw new ArgumentNullException(
nameof(authorParameters),
"Filtering parameters should be passed to avoid data overload.");
}
if (authorParameters.PageNumber < 1 || authorParameters.PageSize < 1)
{
throw new ArgumentException("Invalid page information passed");
}
var authors = _context.Authors.AsQueryable();
if (!string.IsNullOrWhiteSpace(authorParameters.MainCategory))
{
var mainCategory = authorParameters.MainCategory.Trim();
authors = authors.Where(author => author.MainCategory.Equals(mainCategory));
}
if (!string.IsNullOrWhiteSpace(authorParameters.SearchQuery))
{
var searchQuery = authorParameters.SearchQuery.Trim();
authors = authors.Where(
author => author.FirstName.Contains(searchQuery) ||
author.LastName.Contains(searchQuery) ||
author.MainCategory.Contains(searchQuery));
}
totalCount = authors.Count();
var skipCount = (authorParameters.PageNumber - 1) * authorParameters.PageSize;
authors = authors.Skip(skipCount).Take(authorParameters.PageSize);
return(authors.ToList());
}
