Uses EF Core Power Tools by ErikEJ (see link in code) to creates a .DGML class diagram (and serves it up for saving) of most of the EntityFrameworkCore (EF Core 2) entities in the ASP.Net MVC project when you go to yourwebsite/dgml. This is useful because there is no Class Diagram support in .Net Core 2 yet and it is difficult to find any kind o…

DgmlController.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace CHANGEME.Api.Controllers
{	
	[Route("Dgml")]
	public class DgmlController : Controller
	{
		public CHANGEMEDbContext _context { get; }


		public DgmlController( CHANGEMEDbContext context)
		{            
		  _context = context;						
		}
        
		/// <summary>
		/// Creates a DGML class diagram of most of the entities in the project wher you go to localhost/dgml
		/// See https://github.com/ErikEJ/SqlCeToolbox/wiki/EF-Core-Power-Tools
		/// </summary>
		/// <returns>a DGML class diagram</returns>
		[HttpGet]
		public IActionResult Get()
		{

			System.IO.File.WriteAllText(Directory.GetCurrentDirectory() + "\\Entities.dgml",
				_context.AsDgml(), 
                                System.Text.Encoding.UTF8);

                         var file = System.IO.File.OpenRead(Directory.GetCurrentDirectory() + "\\Entities.dgml");
                         var response = File(file, "application/octet-stream", "Entities.dgml");
                         return response;
		}
    }
}

Very useful and perfectly working! Many thanks for sharing!