/// <summary>
/// Initializes a new instance of the <see cref="T:RSql4Net.Models.Paging.Page`1" /> class.
/// </summary>
/// <param name="content">Content.</param>
/// <param name="irSqlPageable">Pageable.</param>
/// <param name="total">Total.</param>
public RSqlPage(List <T> content, IRSqlPageable <T> irSqlPageable = null, long?total = null)
{
Content = content ?? new List <T>();
if (total == null)
{
TotalElements = Content.Count;
}
else
{
TotalElements = total.Value < Content.Count ? Content.Count : total.Value;
}
HasContent = Content.Count > 0;
if (HasContent)
{
NumberOfElements = Content.Count;
}
if (irSqlPageable == null)
{
return;
}
Number = irSqlPageable.PageNumber();
HasPrevious = irSqlPageable.PageNumber() > 0;
HasNext = TotalElements > NumberOfElements + (Number * irSqlPageable.PageSize());
var mod = (int)TotalElements % irSqlPageable.PageSize();
var quo = (int)TotalElements - mod;
TotalPages = (quo / irSqlPageable.PageSize()) + (mod > 0 ? 1 : 0);
}
/// <summary>
///
/// </summary>
/// <param name="obj"></param>
/// <param name="query"></param>
/// <param name="pageable"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public static IRSqlPage <T> Page <T>(this IQueryable <T> obj,
IRSqlPageable <T> pageable,
IRSqlQuery <T> query = null) where T : class
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (pageable == null)
{
throw new ArgumentNullException(nameof(pageable));
}
var where = query == null?RSqlQueryExpressionHelper.True <T>() : query.Value();
var count = obj.Count(where);
IOrderedQueryable <T> sorted = null;
if (pageable.Sort() != null)
{
var sort = pageable.Sort();
sorted = sort.IsDescending ? obj.OrderByDescending(sort.Value) : obj.OrderBy(sort.Value);
sort = sort.Next;
while (sort != null)
{
sorted = sort.IsDescending ? sorted.ThenByDescending(sort.Value) : sorted.ThenBy(sort.Value);
sort = sort.Next;
}
}
var offset = pageable.PageNumber() * pageable.PageSize();
var limit = pageable.PageSize();
var result = (sorted ?? obj).Where(where)
.Skip(offset)
.Take(limit)
.ToList();
return(new RSqlPage <T>(result, pageable, count));
}