I'm looking to do a GroupBy and a Select in Linq, but the following doesn't compile:
foreach (string fooName in fooList.GroupBy(f => f.Name).Select(f => f.Name)) { ... } Why am I unable to use f => f.name in my Select clause? More importantly, is there any way around this?
GroupBy returns a sequence of IGrouping<TKey, TSource>, so the lambda parameter in the Select method is of type IGrouping<TKey, TSource>, not TSource. Instead you can do this:
foreach (string fooName in fooList.GroupBy(f => f.Name).Select(grouping => grouping.Key)) { ... } But anyway, there is a simpler way to achieve the same result:
foreach (string fooName in fooList.Select(f => f.Name).Distinct()) { ... } 
GroupBy groups the values into key value pairs, so you probably want
foreach (string fooName in fooList.GroupBy(f => f.Name).Select(f => f.Key)) { ... } 