/// <summary>
/// 分页集合
/// </summary>
/// <param name="expression"></param>
/// <param name="sorts"></param>
/// <param name="page"></param>
/// <param name="resultsPerPage"></param>
/// <param name="isTotal"></param>
/// <param name="total"></param>
/// <returns></returns>
public IEnumerable <T> GetPage(Expression <Func <T, bool> > expression, Sorting <T>[] sorts, int page, int resultsPerPage, bool isTotal, ref int total)
{
if (sorts == null || sorts.Count() == 0)
{
throw new ArgumentNullException("排序字段不能为空");
}
var predicates = expression.ToPredicateGroup();
if (isTotal)
{
total = _context.Count <T>(predicates);
}
return(_context.GetPage <T>(predicates, sorts.ToSortable(), page, resultsPerPage));
}