Filter IDictionary(Of TK, TV) to an IDictionary(Of TK, TV) with linq

Question

Something very basic seems to be escaping me.

Dim foo As New Dictionary(Of String, String)
foo.Add("key", Nothing)
foo.Add("key2", "something")

I wish to get a IDictiorany(Of String, String) back, with only elements that have a non empty value. I thought this would do it:

foo.Where(Function(x) Not String.IsNullOrEmpty(x.Value))

But that ends up being the wrong type. Adding:

.ToDictionary(Function(x) x.Key)

Doesn't help any either. Any tips?

Answer 1

Ah... Answered my own question. Will leave this up just in case it is of any use to someone else.

Dim foo As Dictionary(Of String, String)
foo.Add("k1", Nothing)
foo.Add("k2", "something")

Dim IDictionary(Of String, String) res = foo _
    .Where(Function(x) Not String.IsNullOrEmpty(x.Value)) _
    .ToDictionary(Function(x) x.Key, Function(y) y.Value)