No non-OData HTTP route registered

Question

I followed this tutorial to create a WebAPI REST service.

After that, I could load the list of all contacts by pointing at http://baseaddress/api/Contacts.

Then I added the following code in the Register method in WebApiConfig.cs in order to enable an OData endpoint:

config.Count().Filter().OrderBy().Expand().Select().MaxTop(null);

ODataModelBuilder builder = new ODataConventionModelBuilder();
builder.EntitySet<Contact>("Contacts");
config.MapODataServiceRoute(
    routeName: "OData",
    routePrefix: "odata",
    model: builder.GetEdmModel());

And also added the [EnableQuery] parameter on the Contact.GetContacts() method. That way, I am able to query for particular contacts like this:

http://baseaddress/odata/Contacts?$filter=startswith(Name,'A')

and it works like charm.

Unfortunately, when I put the [EnableQuery], the WebAPI endpoint stops working, showing instead the following error:

No non-OData HTTP route registered.

in System.Web.OData.Extensions.HttpConfigurationExtensions.GetNonODataRootContainer(HttpConfiguration configuration)
in System.Web.OData.Extensions.HttpRequestMessageExtensions.GetRootContainer(HttpRequestMessage request, String routeName)
in System.Web.OData.Extensions.HttpRequestMessageExtensions.CreateRequestScope(HttpRequestMessage request, String routeName)
in System.Web.OData.Extensions.HttpRequestMessageExtensions.CreateRequestContainer(HttpRequestMessage request, String routeName)
...

What should I do to fix this?

Answer 1

I encountered this problem, and since I'm working with dependency injections I managed to solve this by adding GlobalConfiguration.Configuration.EnableDependencyInjection() to my startup.cs

ex.

using System.Web.OData.Extensions;
public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        GlobalConfiguration.Configuration.EnableDependencyInjection();
    }
}

Answer 2

Adding config.EnableDependencyInjection() in Startup.cs worked for me.

var config = new HttpConfiguration();

config.EnableDependencyInjection();

Answer 3

The key with this issue is to use .EnableDependencyInjection() on Configure method in Startup.cs

If you are using ASP.net Core endpoint routing (recommended if you have at least .net core 3.0 and Microsoft.AspNetCore.OData v7.4.0)

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();

    endpoints.Select().Filter().OrderBy().Count().MaxTop(10);
    endpoints.EnableDependencyInjection();//This guy solves the problem    
    endpoints.MapODataRoute("odata", "odata", GetEdmModel());
});

Otherwise if you are using MVC routing (only way available prior .net core 3.0 and Microsoft.AspNetCore.OData v7.4.0)

app.UseMvc(routeBuilder =>
{
    routeBuilder.Select().Filter().OrderBy().Count().MaxTop(10);
    routeBuilder.EnableDependencyInjection();//This guy solves the problem
    routeBuilder.MapODataServiceRoute("odata", "odata", GetEdmModel());
});

Further reading: https://devblogs.microsoft.com/odata/enabling-endpoint-routing-in-odata/

Answer 4

I encountered this problem before and by the adding the line below it worked for me

protected void Application_Start()
            {  
         GlobalConfiguration.Configuration.EnableDependencyInjection();
             ....  }

Answer 5

I got this error after updating my WebApi project dependencies (NuGet) to:

• Microsoft.AspNet.OData, version="7.0.1"
• Microsoft.OData.Core, version="7.5.0"
• Microsoft.OData.Edm, version="7.5.0"
• Microsoft.Spatial, version="7.5.0"

After downgrading to the versions I used before, the error was gone again:

• Microsoft.AspNet.OData, version="5.8.0"
• Microsoft.OData.Core, version="6.19.0"
• Microsoft.OData.Edm, version="6.19.0"
• Microsoft.Spatial, version="6.19.0"