Can the following be done in LINQ as a one-liner, without using a for-loop?
IEnumerable<MyObj> MyList = EF.GetList(etc);
foreach (var row in MyList)
{
row.uploadedAt = MyUtils.ConvertToLocalTime(row.uploadedAtUTC, clientTimezone);
}
//return MyList, which now has both dates in LocalTime and UTC
In addition to given answers, there's List<T> method (reference) that mimics foreach loop:
EF.GetList(etc).ToList()
.ForEach(row => row.uploadedAt = MyUtils.ConvertToLocalTime(row.uploadedAtUTC, clientTimezone));
But I don't see any advantage of simplifying things, that are already simple enough.
IMO, too much simplification leads to maintanance horror and reduces readability :)
ForEach. It's a method of the List<T> class.Reassign the list, ideally without mutating anything. This would be more consistent with the functional programming mindset of LINQ.
IEnumerable<MyObj> myList1 = EF.GetList(etc);
IEnumerable<MyObj> myList2 = myList1.Select( x =>
new MyObj
{
uploadedAt = MyUtils.ConvertToLocalTime(x.uploadedAtUTC, x.clientTimezone),
anyOtherFields = x.anyOtherFields
}
).ToList();
If constructing a MyObj is complicated and/or you really need to mutate it, you can also do this:
IEnumerable<MyObj> myList = EF.GetList(etc);
myList = myList.Select( x => {
x.uploadedAt = MyUtils.ConvertToLocalTime(x.uploadedAtUTC, x.clientTimezone);
return x;
}).ToList();
But if you're going to do it that way, you may as well use the for loop.
foreachseems to the cleanest way. Btw, there is no magic inLinq, it's still using looping under the hoodForEach, which does exactly what it seems to do :) Also there is asynchronous versionForEachAsyncForEachin LINQ? I am aware of no such method.MyList.ToList().ForEach(x=>...)