StartupOData.cs

public class Startup
{
  ...

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
  {
      ...
      app.UseMvc(routerBuilder =>
      {
          // 2. Enable Dependency Injection on current routes
          routerBuilder.EnableDependencyInjection(builder =>
          {
              var modelConfig = ODataEntitiesConfiguration.GetEdmModel(app.ApplicationServices);
              builder
              .AddService(Microsoft.OData.ServiceLifetime.Singleton, typeof(IEdmModel), sp => modelConfig)
              .AddService(Microsoft.OData.ServiceLifetime.Singleton, typeof(ODataUriResolver), sp => new StringAsEnumResolver())
              .AddService(Microsoft.OData.ServiceLifetime.Singleton, typeof(ODataUriResolver), sp => new UnqualifiedCallAndEnumPrefixFreeResolver { EnableCaseInsensitive = true });
          });

          // 3. Enable OData operations for all entities
          //routerBuilder.Select().Filter().OrderBy().Expand().MaxTop(null);
      });
  }
}