Why won't my call to a Web API route to the correct method? - asp.net-web-api

Question

I have my first Web API working, but the even when I call it and pass an an id is gets routed to the method that has no arguments.
Here is my controller code:
public class ChartController : ApiController
{
Chart[] _charts = new Chart[]
{
new Chart { Name = "Chart 1" },
new Chart { Name = "Chart 2" },
new Chart { Name = "Chart 3" }
};
// GET api/chart
[Route("api/chart")]
public IEnumerable<Chart> Get()
{
return _charts;
}
// GET api/chart/{id}
[Route("api/chart/{id}")]
public IEnumerable<Chart> Get(int chartId)
{
Chart[] charts = new Chart[]
{
Charts.Database.ChartsDB.GetChart(chartId)
};
return charts;
}
}
Here is my routing in my global.asax
RouteTable.Routes.MapHttpRoute(
name: "ChartApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = System.Web.Http.RouteParameter.Optional }
);
This is my request uri
http://localhost:42311/api/chart
And the results
[
{
"Name": "Chart 1"
},
{
"Name": "Chart 2"
},
{
"Name": "Chart 3"
}
]
When I change the uri to
http://localhost:42311/api/chart/1
I get the same results, as both calls are routed to
public IEnumerable<Chart> Get()
What am I doing wrong?

Answer 1

Please note that WebApi works based on reflection this means that your curly braces {vars} must match the same name in your methods.
Therefore to match this api/chart/{id} your method needs to be declare like this:
[Route("api/chart/{chartId}"), HttpGet]
public IEnumerable<Chart> Get(int chartId)
return userId;
}
Where the parameter {id} was replaced by chartId.
Another option can be:
[Route("api/chart/{id}"), HttpGet]
public IEnumerable<Chart> Get(int id)
return userId;
}
If you want to read more about this Routing Rules here is similar post on this;
WebApi Routing Configuration