w, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class ClientVendor {
        public int VendorCompanyId{get;set;}
        public int ClientCompanyId{get;set;}
    }
    
     public class Employee {
        public int CompanyId{get;set;}
        public int Id{get;set;}
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            var employeeIds = new int[]{2,9};
            var vendorCompanyId = 2;
            
            var ClientVendors = new List<ClientVendor>{
                new ClientVendor{
                    VendorCompanyId =2,
                    ClientCompanyId =1
                }
            };
            
             var Employees = new List<Employee>{
                new Employee{
                    CompanyId =1,
                    Id =2
                },
                      new Employee{
                    CompanyId =1,
                    Id =10
                },
                   new Employee{
                    CompanyId =1,
                    Id =23
                },
                   new Employee{
                    CompanyId =2,
                    Id =9
                }
                 
            };
            
               var clientEmployeeQuery =
                from clientVenor in ClientVendors
                    .Where(item => item.VendorCompanyId == vendorCompanyId)

join employee in Employees
                on clientVenor.ClientCompanyId equals employee.CompanyId
                into employeeJoin

from employee in employeeJoin
                select employee;

var vendorEmployeeQuery = Employees
                .Where(item => item.CompanyId == vendorCompanyId);

clientEmployeeQuery
                .ToList()
                .ForEach(item =>Console.WriteLine(item.Id));
            Console.WriteLine("-----------------------------------");
            
            clientEmployeeQuery
                .Union(vendorEmployeeQuery)
                .ToList()
                .ForEach(item =>Console.WriteLine(item.Id));
             Console.WriteLine("-----------------------------------");
            
            Console.WriteLine( clientEmployeeQuery
                .Union(vendorEmployeeQuery)
                .All(item => employeeIds.Contains(item.Id)));
            
             Console.WriteLine("-----------------------------------");
            
            Console.WriteLine( clientEmployeeQuery
                .Union(vendorEmployeeQuery)
                .Any(item => !employeeIds.Contains(item.Id)));
        }
    }
}

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