Question

I am having some trouble trying to make a cast or make the right conversion.
I have a query of type IQueryable<T> T been a class:

var query = (from x in query
             group x by US.FirstName into g
             select g).Distinct();

I receive this error :

Cannot implicitly convert type System.Linq.IQueryable<System.Link.IGrouping<string,T>> to System.Linq.IQueryable<T>.>>

What I want to perform in fact is to return unique values of a query.

Answer 1

vQuery = vQuery.GroupBy(x => x.FirstName)
         .Select(g => g.First());

but this will be rather arbitrary : you should do an OrderBy or an OrderByDescending

.Select(g => g.OrderBy(x => x.WhatEverYouWant).First())

found with “your” syntax

vQuery = (from US in vQuery
 group US by US.FirstName into g
 select g.First())