Group by Multiple Columns in LINQ C# Archives - Tech Insights Unveiling Tomorrow's Tech Today, Where Innovation Meets Insight Wed, 22 Nov 2023 07:35:55 +0000 en-US hourly 1 https://wordpress.org/?v=6.6.1 https://i0.wp.com/reactconf.org/wp-content/uploads/2023/11/cropped-reactconf.png?fit=32%2C32&ssl=1 Group by Multiple Columns in LINQ C# Archives - Tech Insights 32 32 230003556 Group by Multiple Columns in LINQ C# https://reactconf.org/how-to-group-by-multiple-columns-in-linq-csharp/ https://reactconf.org/how-to-group-by-multiple-columns-in-linq-csharp/#respond Wed, 22 Nov 2023 07:35:55 +0000 https://labpys.com/?p=2167 In this article, we will learn the Group y multiple Columns in LINQ C#. The ‘group by ‘method in LINQ to group data based on one or more columns. Here’s …

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In this article, we will learn the Group y multiple Columns in LINQ C#. The ‘group by ‘method in LINQ to group data based on one or more columns.

Here’s an example of how to Group by multiple columns using LINQ in C#.

Create an Asp.NET Core MVC or Web API Project

Assuming you have Visual Studio 2019 or Visual Studio 2022 installed, follow these steps to create a new ASP.NET Core Project

  • Open the visual studio (IDE).
  • Click on the “Create new project” option.
  • Choose “ASP.NET Core Web Application” from the list of available templates.
  • Click the Next button.
  • The configure a new project, specify the name and location of your project.
  • Click the “Next” button.
  • Then select .Net Core as the runtime and choose the version from the dropdown list at the top.
  • Make sure to uncheck the checkboxes for “Enable Docker Support” and “Configure for HTTPS” since we won’t be using authentication.
  • Click the “Create” button

Consider an example Employee class with properties like FirstName, LastName, City, and State. We’ll group employees based on their City and State.

Create a Model

namespace WEB_API_without_EF.Models
{
    public class Employees
    {
        public int ID { get; set; }
        public string Company { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        public string JobTitle { get; set; }
        public string Address { get; set;}

        public string City { get; set; }

        public string state { get; set; }

    }
}

Create a Controller


namespace WEB_API_without_EF.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmployeeController : ControllerBase
    {

        [HttpGet("GetgroupBy")]
        public IActionResult GetgroupBy()
        {
            List<Employees> employees = new List<Employees>
            {
                new Employees{FirstName="Anna", LastName="Bedecs", Company="Company A", City="Seattle",state="WA"},
                new Employees{FirstName="Antonio", LastName="Gratacos Solsona", Company="Company B", City="Boston",state="MA"},
                new Employees{FirstName="Thomas" ,LastName="Axen", Company="Company C", City="Seattle",state="WA"},
                new Employees{FirstName="Christina", LastName="Lee", Company="Company D", City="New York",state="NY"},
                new Employees{FirstName="Martin" ,LastName="O’Donnell", Company="Company E", City="Minneapolis",state="MN"},
                new Employees{FirstName="Francisco", LastName="Pérez-Olaeta", Company="Company F", City="Milwaukee",state="WI"},

            };

            var groupemployee = from emp in employees
                                group emp by new { emp.City, emp.state } into empgroup
                                select new
                                {
                                   Name =$"City : {empgroup.Key.City} State : {empgroup.Key.state}",
                                   employees= empgroup.ToList(),
                                };
            
      

            return Ok(groupemployee);

        }
}
}

Output:

Group by Multiple Columns in LINQ C#

See More :

Upload Multiple Files in Angular with ASP.NET Core Web API

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