public static IQueryable <TAny> Sort <TAny>(this IQueryable <TAny> list, string sortstring)
{
if (string.IsNullOrEmpty(sortstring))
{
return(list);
}
var sort = SortStruc <TAny> .CreateFrom(sortstring);
//see also BaseNHibernateLinqDao.Sort,here use ThenBy while there only use OrderBy,I think they are the same.
if (sort.Length > 0)
{
var orderedlist = sort[0].OrderByDirection == OrderByDirectionEnum.Asc
? list.OrderBy(sort[0].OrderByExpression)
: list.OrderByDescending(sort[0].OrderByExpression);
for (var i = 1; i < sort.Length; i++)
{
orderedlist = sort[i].OrderByDirection == OrderByDirectionEnum.Asc
? orderedlist.ThenBy(sort[i].OrderByExpression)
: orderedlist.ThenByDescending(sort[i].OrderByExpression);
}
return(orderedlist);
}
return(list);
}
/// <summary>
///
/// </summary>
/// <param name="sort">should be a comma delimetered string</param>
/// <returns></returns>
public static SortStruc <T>[] CreateFrom(string sort)
{
if (string.IsNullOrEmpty(sort))
{
return(null);
}
var sortStrucList = sort.Split(',');
var a = new SortStruc <T> [sortStrucList.Length];
var i = 0;
foreach (var sortStrucString in sortStrucList)
{
var sortStrucPair = sortStrucString.Split(' ');
var direction = sortStrucPair.Length == 1 ? "asc" : sortStrucPair[1].ToLower();
a[i++] = new SortStruc <T>
{
OrderByExpression =
System.Linq.Dynamic.DynamicExpression.ParseLambda <T, Object>(sortStrucPair[0]),
OrderByDirection =
direction == "asc"
? OrderByDirectionEnum.Asc
: OrderByDirectionEnum.Desc
};
}
return(a);
}
/// <summary>
/// currently use linqtoobject to do sorting,so all records will be loaded.
/// this is only for use when subquery-ordering is involved,which nhibernate dosen't surport .
/// </summary>
/// <typeparam name="TAny"></typeparam>
/// <param name="list"></param>
/// <param name="sortstring"></param>
/// <returns></returns>
public static IList <TAny> Sort <TAny>(this IList <TAny> list, string sortstring)
{
if (string.IsNullOrEmpty(sortstring))
{
return(list);
}
var sort = SortStruc <TAny> .CreateFrom(sortstring);
if (sort.Length > 0)
{
var orderedlist = sort[0].OrderByDirection == OrderByDirectionEnum.Asc
? list.OrderBy(sort[0].OrderByExpression.Compile())
: list.OrderByDescending(sort[0].OrderByExpression.Compile());
for (var i = 1; i < sort.Length; i++)
{
orderedlist = sort[i].OrderByDirection == OrderByDirectionEnum.Asc
? orderedlist.ThenBy(sort[i].OrderByExpression.Compile())
: orderedlist.ThenByDescending(sort[i].OrderByExpression.Compile());
}
return(orderedlist.ToList());
}
return(list);
}
