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ASP.NET Core - Required query string parameters

Typically when designing your API, query string parameters should be reserved for optional arguments.

So for example if ID is a required parameter, it is better to use this as the URI:

https://example.api.com/product/1234

instead of this:

https://example.api.com/product?id=1234

where 1234 is the ID of the requested product.

Of course there are always exceptions and I had a situation where I wanted to use a required query parameter.

ASP.NET Core can help you there by using the [Required] or [BindRequired] attributes on your action method parameters:

Both controllers will return a validation error when invoked without the id parameter:

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