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Web 2.0 API action call with [Route] attribute with optional return 404 not found?

Trying to make a parameter optional in a Web API 2.0 project using this article - basically using a question mark the syntax to make it optional. But the action is not available (404) when the parameter is omitted.

Call format:

/lists/departments : returns 404
/lists/departments/sometype : works

Act:

[HttpGet]
[Route("departments/{type?}")]
public List<Department> Departments(string type)
{
    //this action is not being reached
}

Changing the registration order of the routes in gloabal.asax.cs as shown in this SO post did not help.

Global.asax.cs

public class WebApiApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();

        //WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        GlobalConfiguration.Configure(WebApiConfig.Register);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }
}
+3


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2 answers


Try to give your default type parameter in C # terms. Like this:



[HttpGet]
[Route("departments/{type?}")]
public List<Department> Departments(string type = null)
{
    //this action is not being reached
}
+3


source


As stated in the documentation, you need to provide a default value for the type

http://www.asp.net/web-api/overview/web-api-routing-and-actions/attribute-routing-in-web-api-2#optional

"If the route parameter is optional, you must define a default value for the method parameter."



This should work

[HttpGet]
[Route("departments/{type?}")]
public List<Department> Departments(string type = null)
{
    //this action is not being reached
}
+1


source






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