需要使用DateTime转换的lambda表达式OrderBy

Question

我正在尝试创建一个lambda表达式(Linq,C#3.5),它可以对数据类型为String但实际上包含可解析的DateTime的值执行OrderBy.

例如,典型值可能是"5/12/2009","1/14/2008"等.

下面的OrderBy子句可以正确地进行排序(就像字符串数据一样),但实际上我想将这些值视为DateTimes,并按日期执行排序.(sortColumn类似于"dateCreated".)

List<MyObject> orderedList = unorderedList.OrderBy(p => p.Details.Find(s => s.Name == sortColumn).Value).ToList();

有没有办法转换谓词中的值来执行此操作？任何帮助赞赏!

Answer 1

相当粗糙和低效:

List<MyObject> orderedList = unorderedList.OrderBy(p => DateTime.Parse(p.Details.Find(s => s.Name == sortColumn).Value)).ToList();

减少查找/解析的次数:

List<MyObject> orderedList =
    (from extracted in (from p in unorderedList
                        select new { Item = p, Date = DateTime.Parse(p.Details.Find(s => s.Name == sortColumn).Value })
     orderby extracted.Date
     select extracted.Item)
    .ToList();