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Update index.md (#10388) 

Fixes https://github.com/aspnet/Docs/issues/9051
pull/10399/head
Rick Anderson 2019-01-14 16:36:57 -10:00 committed by GitHub
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aspnetcore/web-api/index.md
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@ -127,7 +127,9 @@ A binding source attribute defines the location at which an action parameter's v
> [!WARNING]
> Don't use `[FromRoute]` when values might contain `%2f` (that is `/`). `%2f` won't be unescaped to `/`. Use `[FromQuery]` if the value might contain `%2f`.
Without the `[ApiController]` attribute, binding source attributes are explicitly defined. In the following example, the `[FromQuery]` attribute indicates that the `discontinuedOnly` parameter value is provided in the request URL's query string:
Without the `[ApiController]` attribute, binding source attributes are explicitly defined. Without `[ApiController]` or other binding source attributes like `[FromQuery]`, the ASP.NET Core runtime attempts to use the complex object model binder. The complex object model binder pulls data from value providers (which have a defined order). For instance, the 'body model binder' is always opt in.
In the following example, the `[FromQuery]` attribute indicates that the `discontinuedOnly` parameter value is provided in the request URL's query string:
[!code-csharp[](define-controller/samples/WebApiSample.Api.21/Controllers/ProductsController.cs?name=snippet_BindingSourceAttributes&highlight=3)]
@ -239,3 +241,4 @@ Use the `ClientErrorMapping` property to configure the contents of the `ProblemD
* <xref:web-api/advanced/formatting>
* <xref:tutorials/web-api-help-pages-using-swagger>
* <xref:mvc/controllers/routing>
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