public static IOrderedQueryable <TEntity> OrderBySpecification <TEntity>(
this IQueryable <TEntity> query,
IOrderBySpecification <TEntity> orderBy)
where TEntity : class
{
Guard.Against <ArgumentNullException>(query == null, "query");
Guard.Against <ArgumentNullException>(orderBy == null, "orderBy");
return(orderBy.ApplyOrderBy(query));
}
public PagedElements <TEntity> GetPagedElements(
int pageIndex,
int pageSize,
ISpecification <TEntity> specification,
IOrderBySpecification <TEntity> orderBySpecification
)
{
// checking arguments for this query
Guard.Against <ArgumentException>(pageIndex < 0, "pageIndex");
Guard.Against <ArgumentException>(pageSize <= 0, "pageSize");
Guard.IsNotNull(orderBySpecification, "orderBySpecification");
Guard.IsNotNull(specification, "specification");
this.logger.Debug(
string.Format(
CultureInfo.InvariantCulture,
"Getting paged elements {0}, pageIndex: {1}, pageSize {2}, oderBy {3}",
typeof(TEntity).Name,
pageIndex,
pageSize,
orderBySpecification.ToString()));
// Create associated IObjectSet and perform query
var objectSet = this.Query();
IQueryable <TEntity> query = objectSet.Where(specification.IsSatisfiedBy());
int total = query.Count();
return(new PagedElements <TEntity>(
query
.OrderBySpecification(orderBySpecification)
.Skip(pageIndex * pageSize)
.Take(pageSize)
.ToList(),
total));
}
