如何通过正确转换为SQL来使两个可以为空的日期之间的差异排序？

Question

我有字典

var OrderBy = new Dictionary<string, IQueryable<Something>>
{
    (...)

    { "DateDifference", OrderDirection == "asc" ?
                        query.OrderBy(x => x.Date1.Value.Date - x.Date2.Value.Date) :
                        query.OrderByDescending(x => x.Date1.Value.Date - x.Date2.Date)},
};

但是当它尝试在Something上进行评估时会出现异常，该日期中的任何一个等于null

有人知道怎么做吗？

Answer 1

好，我是黑客

var OrderBy = new Dictionary<string, IQueryable<Something>>
{
    (...)

    { "DateDifference", input.OrderDirection == "asc" 

                        ?

                        input.OrderBy(x => 
                        (x.Date1 == null ? new DateTime(0).Date : x.Date1.Value.Date)
                        -
                        (x.Date2 == null ? new DateTime(0).Date : x.Date2.Value.Date)) 

                        :

                        input.OrderByDescending(x => 
                        (x.Date1 == null ? new DateTime(0).Date : x.Date1.Value.Date)
                        -
                        (x.Date2 == null ? new DateTime(0).Date : x.Date2.Value.Date)) },
};