Question

Previously in WebAPI (beta) I was able to create a “GetAll” method that took in optional parameters added on the URI:

http://localhost/api/product?take=5&skip=10 

This still seems to work but only if I include all the parameters. In (beta), I could omit the parameters ( http://localhost/api/product/ ) and the “GetAll” method would get called (take & skip would be null). I could also omit some of the parameters http://localhost/api/product?take=5 (skip would be null)

public IEnumerable<ProductHeaderDto> GetAll(int? take, int? skip)
{
    var results = from p in productRepository
                  select new ProductHeaderDto
                    {
                        Id = p.Id,
                        Version = p.Version,
                        Code = p.Code,
                        Description = p.DescriptionInternal,
                        DisplayName = p.Code + " " + p.DescriptionInternal
                    };
    if (skip != null) results = results.Skip(skip.Value);
    if (take != null) results = results.Take(take.Value);
    return results;
}

In (RC), I now get “No action was found on the controller ‘Product’ that matches the request.” when both or one of the parameters are missing. I have tried adding [FromUri] on the method parameters but that has no affect:

public IEnumerable<ProductHeaderDto> GetAll([FromUri] int? take, [FromUri] int? skip)

I have also tried setting default values:

public IEnumerable<ProductHeaderDto> GetAll(int? take = null, int? skip = null)

Is there some sort of “optional” parameter attribute that could be used when trying to match the method signature?

Answer 1

This is a bug which has been fixed in RTM. You can have optional parameter by specifying default value.

public IEnumerable<string> Get(int? take = null, int? skip = null)

BTW, you can use $skip and $top in web api odata package to achieve the same functions.