Question

I have two list collection of objects as in a format:

list1{
       new Object1{ State= "AL" , Value = 3.123}
       new Object2{ State= "CO", Value = 2.111}
       }

list2{
       new Object1{State="AL", Value=2.123}
       new Object2{State="CO", Value=3.111}
     }

I need to compare these two lists and generate another list like the following:

list3{
      new Object1{State="AL", Value= (3.123 + 2.123)}
      new Object2{ State="CO", Value =(2.111 + 3.111) }
     }

Can somebody tell me how can i do this?

Answer 1

Andre’s answer will certainly work. You can generalize this to the concept of grouping and support an arbitrary number of IEnumerables to merge

List<MyEntity> source1 = ...;
List<MyEntity> source2 = ...;
IEnumerable<MyEntity> source3 = ...;

var mergedList = (from item in source1.Contact(source2).Concat(source3)
                  group item by item.Name into g
                  select new MyEntity { Name = g.Key, Value = g.Sum(e => e.Value) })
                  .ToList();