How to fix "Register the constraint type with 'Microsoft.AspNetCore.Routing.RouteOptions.ConstraintMap"?

Question

Hello!

I know this question has several posts with multiple answers but in my case I haven't found the solution.

• I'm building a Web Api with NET 8
• My Web Api has swagger
• I'm using Dependency Injection, Service layer, UnityOfWork and Repository pattern
• I'm not using CORS in this moment

So the stack trace pattern to get the data it looks like this:

_myService.GetUsers() => _unityOfWork.UsersRepository.GetAll() => _context.Users.ToList()

In my case, I have only 3 controllers performing simple CRUD operations

In every class I have something like this:

[Produces("application/json")]
[Route("api/[controller]/[action]")]
[ApiController]
public class UsersController : ControllerBase
{     
	private readonly IUserService _userService;     
	private readonly IUserTypeService _userTypeService;     
	private readonly IMapper _mapper;     

	/*Constructor with injections*/
	public UsersController(IUserService userService, 
						   IUserTypeService userTypeService, 
						   IMapper mapper) 
	{     
		_userService = userService;     
		_mapper = mapper;     
		_userTypeService = userTypeService; 
	}

    [HttpPost] 
    public IActionResult TestAction([FromBody] UserRegisterDto registeredUserDto) 
    {     
          /*---Some code snippet here ---*/
    }
}

Swagger is displaying my Controllers and Endpoints as expected

But it doesn't matter what actions I execute, it throws the same error for all the actions; some of them are HttpGet, HttpPost, HttpPatch, etc.

Body request:

Note: All the properties are string types in the backend class (UserRegisterDto.cs)

{   
  "username": "string",   
  "name": "string",   
  "password": "string",   
  "role": "string" 
}

This is my Program.cs file

using Microsoft.AspNetCore.Builder; 
using Microsoft.AspNetCore.Hosting; 
using Microsoft.Extensions.Configuration; 
using Microsoft.Extensions.DependencyInjection; 
using Microsoft.Extensions.Hosting; 
using System; using System.Reflection; 
using Sat.Recruitment.Infrastructure.Extensions; 
using Microsoft.AspNetCore.Mvc;  

var builder = WebApplication.CreateBuilder(args);
    builder.Services.AddOptions(builder.Configuration); 
	builder.Services.AddDbContexts(builder.Configuration); 			
	builder.Services.AddServices(builder.Configuration); 
	builder.Services.AddSingleton(builder.Configuration); builder.Services.AddSwagger($"	
								{Assembly.GetExecutingAssembly().GetName().Name}.xml"); 
	
	builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies()); 	
	builder.Services.AddControllers(options => {     	
			options.CacheProfiles.Add("Default30seconds", new CacheProfile { Duration = 30 
			}); }).AddNewtonsoftJson();  

var app = builder.Build();  // Configure the HTTP request pipeline. 

if (app.Environment.IsDevelopment()) 
{     
	app.UseDeveloperExceptionPage();     
	app.UseSwagger();     
	app.UseSwaggerUI(); 
}  

app.UseHttpsRedirection();   
app.UseRouting(); 
app.UseAuthentication(); 
app.UseAuthorization();  
app.UseEndpoints(endpoints => { _ = endpoints.MapControllers(); });  
app.Run();

I don't know what exactly I have to fix. I already checked my dependencies and it seems everything it's ok. I have a breakpoint in the UserController constructor but it's not reached by the request.

Dependencies file

Does anyone have any idea what is happening?

Regards!

-David from México

Answer 1

In one of your route constraints, you defined a parameter type as :string. This is not valid see

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/routing?view=aspnetcore-3.1#route-constraint-reference