Question

hi I have the following code and would like to only make each union if a condition is true.
I Know I could write a select of if else but wanted to know if there is a slicker Linq way!?

        //join the list into one and sort by seqnumber
      SegmentList = Alist.Cast<BaseSegment>()
     .Union(BList.Cast<BaseSegment>()).Union(CList.Cast<BaseSegment>())
     .OrderBy(item => item.SegSeqNumber).ToList();

So given the above if ATest =true how do I only iclude Alist like wise if BTest && CTest are true how do I include only BList and Clist

Thanks

Answer 1

To do it in a LINQ style way with your checkboxes, something like:

SegmentList = Alist.Where(i => checkbox1.IsChecked).Cast<BaseSegment>()
.Union(BList.Where(i => checkbox2.IsChecked).Cast<BaseSegment>())
.Union(CList.Where(i => checkbox3.IsChecked).Cast<BaseSegment>())
.OrderBy(item => item.SegSeqNumber).ToList();

would work. But I don’t think it is either very understandable or efficient.