Question

I have two lists …

List<ObjectA> listA
List<ObjectB> listB

Both have a int property ID, that is unique…

I´d like to get all objects from listA that have listA[x].ID = listB[x].ID, using LINQ…

Thanks

Answer 1

You need to use the .Join(...) function.

In query syntax, it would look something like this:

var result = from a in listA
             join b in listB on a.ID equals b.ID
             select new { /* properties you want */ };

In standard C# syntax, it would look something like this:

var result = listA.Join(listB, a => a.ID, b => b.ID, (a, b) => new { /* properties you want */ });