C# Web API INNER JOIN and RETURN Query value

Question

EF Model Image References

I was planned to read data from database and then using INNER JOIN in C# WebApi contr

Answer 1

As per the Model given above, you should change your query as something like:

public class JoinController: ApiController
{
DepartmentServicesEntities DSE = new DepartmentServicesEntities();
[Route("Api")]

    [HttpGet]
    public object JoinStatement()
    {
        using (DSE)
        {
            var result = (from e in DSE.employee join d 
            in DSE.department on e.department_id equals d.department_id 
            select new {
            FirstName = e.FirstName, 
            LastName = e.LastName, 
            Gender = e.Gender, 
            Salary = Salary, 
            Department_id = e.Department_id, 
            Department_Name = d.Department_Name
            }).ToList();
        // TODO utilize the above result
        }
    }
}

There is only one issue with the above code as the result will always be an Anonymous Type object. So, it is advisable to use a Data Transfer Object(DTO) whenever you have a case of multi-entity join result for proper mapping.