Implementing versions and data modifications

Now, let’s look at how you can implement some more features, including versioning and enabling data modifications.

Versioning OData controllers

It is good practice to plan for future versions of your OData models that might have different schemas and behavior.

To maintain backward compatibility, you can use OData URL prefixes to specify a version number:

1. In the Northwind.OData project, in the Extensions folder, in IServiceCollectionExtensions.cs, after adding the two OData models for catalog and orders, add a third OData model that has a version number and uses the same GetEdmModelForCatalog method, as shown in the following code:

   // GET /catalog/v1, /catalog/v2, and so on.
   .AddRouteComponents(routePrefix: "catalog/v{version}",
     model: GetEdmModelForCatalog())
   

2. In ProductsController.cs, modify the Get methods to add a string parameter named version that defaults to "1&quot...