When methods have the name ...Async the exception "System.InvalidOperationException: No route matches the supplied values" occurs

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Steps to reproduce:

  • Create a new Web API project
  • Create a UsersController with the following code

.

[ApiController]
[Route("[controller]")]
public class UsersController : ControllerBase
{
    [HttpGet("{id:int}", Name = nameof(GetUserByIdAsync))]
    public async Task<ActionResult<object>> GetUserByIdAsync([FromRoute] int id)
    {
        object user = null;

        return Ok(user);
    }

    [HttpPost]
    public async Task<ActionResult<object>> CreateUserAsync()
    {
        object user = null;

        return CreatedAtAction(nameof(GetUserByIdAsync), new { id = 1 }, user);
    }
}

System.InvalidOperationException: No route matches the supplied values.

  • Rename both methods by removing the Async from the method names, the methods should look like

    [HttpGet("{id:int}", Name = nameof(GetUserById))]
public async Task<ActionResult<object>> GetUserById([FromRoute] int id)
{
    // ...
}

[HttpPost]
public async Task<ActionResult<object>> CreateUser()
{
    // ...
}

  • Call the url POST https://localhost:5001/users again

  • You will receive an empty 201 response

So I'm assuming the error occurs with the method names, any ideas?

asp.net-core-mvc asp.net-core .net-core asp.net-web-api c#
1 Answers

System.InvalidOperationException: No route matches the supplied values.

To fix above error, you can try to set SuppressAsyncSuffixInActionNames option to false, like below.

services.AddControllers(opt => { 
    opt.SuppressAsyncSuffixInActionNames = false; 
});

Or apply the [ActionName] attribute to preserve the original name.

[HttpGet("{id:int}", Name = nameof(GetUserByIdAsync))]
[ActionName("GetUserByIdAsync")]
public async Task<ActionResult<object>> GetUserByIdAsync([FromRoute] int id)
{
user_67516340
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