How do I use Linq ToDictionary to return a dictionary with multiple values in the dictionary items?

You could first group all your result by name and then call to dictionnary with the group key as key I don't know how to code it in VB but what it would look like in C Dictionary> dict = orders . GroupBy(x => x. Name) .

ToDictionary(gr => gr. Key,gr=>gr.ToList() ).

You could first group all your result by name and then call to dictionnary with the group key as key I don't know how to code it in VB but what it would look like in C# Dictionary> dict = orders . GroupBy(x => x. Name) .

ToDictionary(gr => gr. Key,gr=>gr.ToList() ).

Dim f = d. GroupBy(Function(x) x. PoolName).

ToDictionary(Function(t) t. Key, Function(g) g.ToList()) - I'll give it a go! – digiguru Jan 26 '10 at 21:28 This worked like a dream, thanks – digiguru Jan 26 '10 at 23:12.

Instead of ToDictionary, you want ToLookup. A lookup will store a list of values for each key, so the key is no longer required to be unique. The lookup returned from this method is immutable though.

The idea is to have multiple items for each key, so the intention is to have it as unique. Is a Lookup Enumerable? – digiguru Jan 26 '10 at 23:10 Yes, it as enumeration over groupsas mentioned in the documentation: msdn.microsoft.Com/en-us/library/bb460184.

Aspx It does exactly what the accepted solution does, but is a built in function: orders. ToLookup(x => x.Name, x => x); – Chris Jan 26 '10 at 23:51.

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