Question

I’m trying to grab all users joined with Company

var users = CreateObject<User>();
var companies = CreateObject<Company>();

var companyUsers = users
    .Where(u => u.IsEmployee)
    .Join(companies, u => u.UserId, c => c.UserId, (u, c) => u.UserId)
    .ToList();

Problem: I’m trying to return companyUsers which is of type List and my method’s return type is List that this code is in but I get the error that List cannot be converted to List when I do a return companyUsers for this method.

I figured it’s just a syntax error in that LINQ is trying to return a different type due to a syntax issue in my query that I cannot see.

Answer 1

basically it’s saying I can’t assign the returned LINQ type to my companyUsers and company users is a List<User>

You are not selecting a user, you are selecting a user ID in your query. The output then is a List<X>, where X is the type of UserId (I presume it’s an int or some other basic type).

To fix this issue to get a List<User>, change your join to produce a different output.

.Join(companies, u => u.UserId, c => c.UserId, (u, c) => u)
.ToList();