public PageDefinition(IPagerFilter pagerFilter, int itemCount)
{
ItemCount = itemCount;
PageSize = Calculate.ValidPageSize(pagerFilter.PageSize);
PageIndex = Calculate.ValidPageIndex(pagerFilter.PageIndex, pagerFilter.PageSize, itemCount);
PageCount = Calculate.TotalPageCount(itemCount, PageSize);
SkipIndex = Calculate.SkipIndex(pagerFilter.PageIndex, pagerFilter.PageSize);
}
/// <summary>
/// Converts IEnumerable to a Page
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="pagerFilter"><see cref="IPagerFilter"/></param>
/// <returns></returns>
public static Page <T> ToPage <T>(this IEnumerable <T> source, IPagerFilter pagerFilter)
{
Validator.Validate(pagerFilter);
var pd = new PageDefinition(pagerFilter, source.Count());
return(pd.ItemCount < 1
? Page <T> .FromEnumerable(source, pd)
: Page <T> .FromEnumerable(source.Skip(pd.SkipIndex).Take(pd.PageSize), pd));
}
/// <summary>
/// Converts IQueryable to a Page
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="pagerFilter"><see cref="IPagerFilter"/></param>
/// <param name="itemCount">Total item count of IQueryable</param>
/// <param name="prePaged">Is the IQueryable already prepaged. If so the IQueryable will not be paged anymore.</param>
/// <returns></returns>
public static Page <T> ToPage <T>(this IQueryable <T> source, IPagerFilter pagerFilter, int itemCount, bool prePaged = false)
{
Validator.Validate(pagerFilter);
var pd = new PageDefinition(pagerFilter, itemCount);
return(prePaged || pd.ItemCount < 1
? Page <T> .FromEnumerable(source, pd)
: Page <T> .FromEnumerable(source.Skip(pd.SkipIndex).Take(pd.PageSize), pd));
}
internal static void Validate(IPagerFilter pagerFilter)
{
if (pagerFilter.PageIndex < 1)
{
throw new ArgumentOutOfRangeException("IPagerFilter.PageIndex", "Can not be less then zero or zero.");
}
if (pagerFilter.PageSize < 1)
{
throw new ArgumentOutOfRangeException("IPagerFilter.PageSize", "Can not be less then zero or zero.");
}
}
/// <summary>
/// Converts asynchronous IEnumerable to a Page
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="pagerFilter"><see cref="IPagerFilter"/></param>
/// <param name="itemCount">Total item count of IEnumerable</param>
/// <param name="prePaged">Is the IEnumerable already prepaged. If so the IEnumerable will not be paged anymore.</param>
/// <returns></returns>
public static async Task <Page <T> > ToPageAsync <T>(this IEnumerable <T> source, IPagerFilter pagerFilter, int itemCount, bool prePaged = false)
{
Validator.Validate(pagerFilter);
var pd = new PageDefinition(pagerFilter, itemCount);
return(prePaged || pd.ItemCount < 1
? await Task.Run(() => Page <T> .FromEnumerable(source, pd)).ConfigureAwait(false)
: await Task.Run(() => Page <T> .FromEnumerable(source.Skip(pd.SkipIndex).Take(pd.PageSize), pd)).ConfigureAwait(false));
}
