private string CreateProductsResourceUri(ProductDtoParameter parameters, ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link(nameof(GetProducts), new
{
CategoryID = parameters.CategoryID,
OrderBy = parameters.OrderBy,
PageNumber = parameters.PageNumber - 1,
PageSize = parameters.PageSize
}));
case ResourceUriType.NextPage:
return(Url.Link(nameof(GetProducts), new
{
CategoryID = parameters.CategoryID,
OrderBy = parameters.OrderBy,
PageNumber = parameters.PageNumber + 1,
PageSize = parameters.PageSize
}));
default:
return(Url.Link(nameof(GetProducts), new
{
CategoryID = parameters.CategoryID,
OrderBy = parameters.OrderBy,
PageNumber = parameters.PageNumber,
PageSize = parameters.PageSize
}));
}
}
public async Task <ActionResult <IEnumerable <ProductDto> > > GetProducts([FromQuery] ProductDtoParameter parameter)
{
var queryProduct = productRepository.GetQueryableProducts().Where(p => p.OnSale && !p.IsDeleted);
if (!string.IsNullOrWhiteSpace(parameter.CategoryID))
{
queryProduct = queryProduct.Where(p => p.CategoryID.Equals(parameter.CategoryID));
}
switch (parameter.OrderBy)
{
case OrderType.None:
queryProduct = queryProduct.OrderBy(p => p.OrderbyId);
break;
case OrderType.Recommend:
queryProduct = queryProduct.Where(p => p.Recommend > 0)
.OrderBy(p => p.Recommend);
break;
case OrderType.TopSales:
queryProduct = queryProduct.OrderByDescending(p => p.SoldCount);
break;
default: throw new IndexOutOfRangeException();
}
var pagedProduct = await PagedList <Product> .Create(queryProduct, parameter.PageNumber, parameter.PageSize);
var previousPageLink = pagedProduct.HasPrevious
? CreateProductsResourceUri(parameter, ResourceUriType.PreviousPage)
: null;
var nextPageLink = pagedProduct.HasNext
? CreateProductsResourceUri(parameter, ResourceUriType.NextPage)
: null;
var paginationMetadata = new
{
totalCount = pagedProduct.TotalCount,
pageSize = pagedProduct.PageSize,
currentPage = pagedProduct.CurrentPage,
totalPages = pagedProduct.TotalPages,
previousPageLink,
nextPageLink
};
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(paginationMetadata, new JsonSerializerOptions
{
Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
}));
var productDtos = mapper.Map <IEnumerable <ProductDto> >(pagedProduct);
return(Ok(productDtos));
}
