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Lucas. D
Asked: 2020-04-18 06:31:51 +0800 CST 2020-04-18 06:31:51 +0800 CST

How to resolve "The request method matched multiple endpoints" exception?

  • 772

I have a fairly simple API that, when hitting one of the endpoints, gives me the following stack trace

Microsoft.AspNetCore.Routing.Matching.AmbiguousMatchException: The request matched multiple endpoints. Matches:

VimTube.Controllers.CategoryController.GetAllCategories (VimTube) VimTube.Controllers.CategoryController.GetCategoryByName (VimTube)

I understand that it is failing because I have two methods that point to the same URL. The same are the following

[HttpGet]
public Task<ActionResult<IEnumerable<Category>>> GetAllCategories()
{
    return _repository.FindAll();
}

[HttpGet]
public IEnumerable<Category> GetCategoryByName([FromQuery]string name)
{
    return _repository.ListCategoriesWhichStartsWith(name);
}

And my controller class is prefixed with vimtube/categories .

My idea would be to have these url's

  1. vimtube/categories returns a list of all categories.
  2. vimtube/categories?name=Ent returns the categories that start with the query you passed to it.

I read that with [FromQuery] this was possible, but apparently it is not. Thank you!

c#

1 Answers

  1. Best Answer

    You could specify routes for each method you create using [Route("ruta")], which would be something like

    [HttpGet]
[Route("ruta1")]
public Task<ActionResult<IEnumerable<Category>>> GetAllCategories()
{
    return _repository.FindAll();
}

[HttpGet]
[Route("ruta2")]
public IEnumerable<Category> GetCategoryByName([FromQuery]string name)
{
    return _repository.ListCategoriesWhichStartsWith(name);
}

    Now if you want to include parameters in the Uri you can do it like this [Route("ruta1/{param1:int}")]where it is clear that you can specify the data type, although I have only used them with stringe int.

    And the last thing, I don't remember using [FromQuery] for the parameters, I was limited to [FromBody] and [FromUri]

    Let us know how it goes :)

    • 4