private void BuildUrl(long total, PaginationParams paginationParams, SortParams sortParams, IEnumerable <TData> data)
{
Uri baseUri = new Uri(paginationParams.Host);
Uri uri = new Uri(baseUri, paginationParams.Path);
var lastPage = (int)Math.Ceiling(total / (decimal)paginationParams.PerPage);
if (paginationParams.Page + 1 <= lastPage)
{
var queryNext = GetSortQueryParams(sortParams);
NextPageUrl = QueryHelpers.AddQueryString(uri.ToString(), queryNext);
}
if (paginationParams.Page - 1 >= 1)
{
var queryPrevious = GetSortQueryParams(sortParams);
PreviousPageUrl = QueryHelpers.AddQueryString(uri.ToString(), queryPrevious);
}
}
public Task BindModelAsync(ModelBindingContext bindingContext)
{
StringValues page;
bindingContext.HttpContext.Request.Query.TryGetValue("page", out page);
int?l_page = page.Count > 0 ? page[0].ToN <int>() : null;
StringValues perPage;
bindingContext.HttpContext.Request.Query.TryGetValue("perPage", out perPage);
PerPage?e_pageSize = perPage.Count > 0 ? perPage[0].ToEnum <PerPage>() : null;
string host = $"{bindingContext.HttpContext.Request.Scheme}://{bindingContext.HttpContext.Request.Host.Value}";
string path = bindingContext.HttpContext.Request.Path.Value;
var result = new PaginationParams()
{
Page = l_page ?? 0,
PerPage = e_pageSize ?? PerPage.p10,
Host = host,
Path = path
};
var validationResult = new PaginationParamsValidator().Validate(result);
if (validationResult.IsValid)
{
bindingContext.Result = ModelBindingResult.Success(result);
}
else
{
bindingContext.Result = ModelBindingResult.Failed();
throw new ValidationException(validationResult.Errors);
}
return(Task.CompletedTask);
}
public PaginatedResults(long total, PaginationParams paginationParams, SortParams sortParams, IEnumerable <TData> data)
{
BuildUrl(total, paginationParams, sortParams, data);
CalculateProperties(total, paginationParams);
Data = data.ToList();
}
