Question

Following on from this question:

Linq-to-SQL ToDictionary()

I have a table called Domains, it has two columns:

DomainID int
DomainName varchar(250)

I want to return a Dictionary<int, string>. When I try either of the following LINQ to SQL code:

Dictionary<int, string> dict =     dbc     .Domains     .Select(d => new {d.DomainID, d.DomainName})     .AsEnumerable()     .ToDictionary<int, string>(k => k.DomainID, k => k.DomainName); 

or

Dictionary<int, string> dict =      (from d in dbc.Domains       select new { d.DomainID, d.DomainName })       .AsEnumerable()       .ToDictionary<int, string>(k => k.DomainID, k => k.DomainName); 

I get the following compile error:

Instance argument: cannot convert from 'System.Collections.Generic.IEnumerable<AnonymousType#1>' to 'System.Collections.Generic.IEnumerable<int>'

The scenario here seems the same as q245168 and should work, am I missing something obvious?

Cheers
Kev

Answer 1

Try removing the generic type arguments; the first is the source, not the key:

Dictionary<int, string> dict =  (from d in dbc.Domains   select new { d.DomainID, d.DomainName })   .AsEnumerable()   .ToDictionary(k => k.DomainID, k => k.DomainName); // <==== no angles 

Here, we are using generic type inference to supply the details.