VB.net Linq Expression from ListItemCollection to List(Of Guid)

Question

I want to do something like this:

Dim selectedCourses As List(Of Guid) = From item In chkListCourses.Items Where item.Selected = True Select item.Value

but I get the error:

Unable to cast object of type 'WhereSelectEnumerableIterator2[System.Object,System.Object]' to type 'System.Collections.Generic.List1[System.Guid]'.

The value of item is a string representation of a Guid.

I'd also like the syntax for a Lambda expression.

Answer 1

You have to change your code to this:

Dim selectedCourses As List(Of Guid) = (From item In chkListCourses.Items Where item.Selected = True Select New Guid(item.Value)).ToList(Of Guid)