The type of one of the expression in the join clause is incorrect.Type inference failed in the call to GroupJoin In C#
Hi, I just tested on grouping two collections using GroupJoin approach in LINQ to XML. In the example, the two collections are Customers and Companies. In which, companies served as grouping for the customers. In simple terms, identify a customer of which company he or she belongs. The code below produced an error The type of one of the expression in the join clause is incorrect.Type inference failed in the call to GroupJoin. XElement companiesAndCustomers = new XElement( "CompaniesAndCustomers" , from company in companies join customer in customers on company equals customer.CompanyName into groupCompany select new XElement( "Company" , new XAttribute( "CompanyName" , company.CompanyName), new XAttribute( "Country" , company.Country), from subCustomer in groupCompany select new XElement( "Customer" , subCustomer.LastN