CODEWITHSUNDEEP
asp.netasp.net-mvcasp.net-web-apiasp.net-mvc-5asp.net-mvc-routing
ProfK
ProfK

Reputation: 51094

What is wrong with my Web API routing?

I have a single controller with the two following action signatures. I'm using convetional vs. attribute routing because I've been trying anything to make this work, and conventional removed 1 of 2 problems.

[HttpGet]
[ResponseType(typeof(IEnumerable<EmployeeBindingModel>))]
public async Task<IHttpActionResult> ReadAll()

When I call this from Postman with the URL: http://localhost:53093/api/Employees/ReadAll I get the following JSON back:

{
  "Message": "The request is invalid.",
  "MessageDetail": "The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Threading.Tasks.Task`1[System.Web.Http.IHttpActionResult] Read(Int32)' in 'AcmeSoft.WebApi.Controllers.EmployeesController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."
}

The other action is:

[HttpGet]
[ResponseType(typeof(EmployeeBindingModel))]
public async Task<IHttpActionResult> Read(int id)

and when I call it with this URL: http://localhost:53093/api/Employees/Read/5 I get the expected employee JSON record back.

My routing is set up as follows in WebApiConfig:

//config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{id}",
    defaults: new {id = RouteParameter.Optional});

I've always used this standard boilerplate, and today is the first time I get the error. Why on Earth would an action without a parameter expect one? ReadAll has never had a parameter, so it's not even some ghost. I've deleted all ASP.NET Temporary files with no change.

Upvotes: 0

Views: 942

Answers (1)

Ankush Jain
Ankush Jain

Reputation: 7079

Make change in WebApiConfig:

//config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{action}/{id}",
    defaults: new {id = RouteParameter.Optional});

Use action also in routeTemplate

Upvotes: 2

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