/// <summary>
/// Applies data processing (paging, sorting, filtering and aggregates) over IQueryable using Dynamic Linq.
/// </summary>
/// <typeparam name="T">The type of the IQueryable.</typeparam>
/// <param name="queryable">The IQueryable which should be processed.</param>
/// <param name="take">Specifies how many items to take. Configurable via the pageSize setting of the Kendo DataSource.</param>
/// <param name="skip">Specifies how many items to skip.</param>
/// <param name="sort">Specifies the current sort order.</param>
/// <param name="filter">Specifies the current filter.</param>
/// <param name="aggregates">Specifies the current aggregates.</param>
/// <param name="group">Specifies the current groups.</param>
/// <returns>A DataSourceResult object populated from the processed IQueryable.</returns>
public static DataSourceResult ToDataSourceResult <T>(this IQueryable <T> queryable, int take, int skip, IEnumerable <Sort> sort, Filter filter, IEnumerable <Aggregator> aggregates, IEnumerable <Group> group)
{
var errors = new List <object>();
// Filter the data first
queryable = Filter(queryable, filter, errors);
// Calculate the total number of records (needed for paging)
var total = queryable.Count();
// Calculate the aggregates
var aggregate = Aggregate(queryable, aggregates);
if (group != null && group.Any())
{
//if(sort == null) sort = GetDefaultSort(queryable.ElementType, sort);
if (sort == null)
{
sort = new List <Sort>();
}
foreach (var source in group.Reverse())
{
sort = sort.Append(new Sort
{
Field = source.Field,
Dir = source.Dir
});
}
}
// Sort the data
queryable = Sort(queryable, sort);
// Finally page the data
if (take > 0)
{
queryable = Page(queryable, take, skip);
}
var result = new DataSourceResult
{
Total = total,
Aggregates = aggregate
};
// Group By
if ((group != null) && group.Any())
{
var groupedQuery = queryable.ToList().GroupByMany(group);
result.Group = groupedQuery;
}
else
{
result.Data = queryable.ToList();
}
// Set errors if any
if (errors.Any())
{
result.Errors = errors;
}
return(result);
}
