private string CreateSpeakersResourceUri(
SpeakerResourceParameters speakersParam,
ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link("GetSpeakers",
new
{
pageNumber = speakersParam.PageNumber - 1,
pageSize = speakersParam.PageSize
}));
case ResourceUriType.NextPage:
return(Url.Link("GetSpeakers",
new
{
pageNumber = speakersParam.PageNumber + 1,
pageSize = speakersParam.PageSize
}));
case ResourceUriType.Current:
default:
return(Url.Link("GetSpeakers",
new
{
pageNumber = speakersParam.PageNumber,
pageSize = speakersParam.PageSize
}));
}
}
private IEnumerable <LinkDto> CreateLinksForSpeakers(
SpeakerResourceParameters speakersParam,
bool hasNext, bool hasPrevious)
{
var links = new List <LinkDto>();
// self
links.Add(
new LinkDto(CreateSpeakersResourceUri(
speakersParam, ResourceUriType.Current)
, "self", "GET"));
if (hasNext)
{
links.Add(
new LinkDto(CreateSpeakersResourceUri(
speakersParam, ResourceUriType.NextPage),
"nextPage", "GET"));
}
if (hasPrevious)
{
links.Add(
new LinkDto(CreateSpeakersResourceUri(
speakersParam, ResourceUriType.PreviousPage),
"previousPage", "GET"));
}
return(links);
}
public PagedList <Speaker> GetSpeakers(SpeakerResourceParameters speakerResourceParameters)
{
if (speakerResourceParameters == null)
{
throw new ArgumentNullException(nameof(speakerResourceParameters));
}
var collection = _context.Speakers as IQueryable <Speaker>;
return(PagedList <Speaker> .Create(collection,
speakerResourceParameters.PageNumber,
speakerResourceParameters.PageSize));
}
public IActionResult GetSpeakers([FromQuery] SpeakerResourceParameters speakersParam)
{
var speakersFromRepo = _speakerRepository.GetSpeakers(speakersParam);
//map from repo to DTO
var paginationMetadata = new
{
totalCount = speakersFromRepo.TotalCount,
pageSize = speakersFromRepo.PageSize,
currentPage = speakersFromRepo.CurrentPage,
totalPages = speakersFromRepo.TotalPages
};
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(paginationMetadata));
//response.Headers.Add("X-Paging-PageNo", pageNo.ToString());
//response.Headers.Add("X-Paging-PageSize", pageSize.ToString());
//response.Headers.Add("X-Paging-PageCount", pageCount.ToString());
//response.Headers.Add("X-Paging-TotalRecordCount", total.ToString());
var links = CreateLinksForSpeakers(speakersParam,
speakersFromRepo.HasNext,
speakersFromRepo.HasPrevious);
var shapedSpeakers = _mapper.Map <IEnumerable <SpeakerDto> >(speakersFromRepo)
.ShapeData();
var speakerWithLinks = shapedSpeakers.Select(speaker =>
{
var speakerAsDictionary = speaker as IDictionary <string, object>;
var speakerLinks = CreateLinksForSpeaker((int)speakerAsDictionary["Id"]);
speakerAsDictionary.Add("links", speakerLinks);
return(speakerAsDictionary);
});
var linkedResource = new
{
value = speakerWithLinks,
links
};
return(Ok(linkedResource));
}