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Joining in EF Core

Joining allows you to combine data from multiple tables based on related fields using LINQ in EF Core.

Key Topics

Basic Join

Example

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        using (var context = new MyDbContext())
        {
            var result = context.Employees
                .Join(context.Departments,
                      e => e.DepartmentId,
                      d => d.Id,
                      (e, d) => new { e.Name, DepartmentName = d.Name })
                .ToList();

            foreach (var item in result)
            {
                Console.WriteLine("Name: " + item.Name + ", Department: " + item.DepartmentName);
            }
        }
    }
}

Explanation: This example demonstrates how to join the Employees and Departments tables using LINQ.

Key Takeaways

  • Use the Join() method to combine data from related tables.
  • Return a custom object containing combined fields from the joined tables.
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