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Attribute Routing in WebApi

The following articles explains attribute routing well

• Attribute Routing in ASP.NET Web API 2

We often use the RoutePrefix attribute at the controller level with Route attribute at the method level.

There is a convention to detect the http verb a method supports based on method name, as well as the action parameters from url query string. We need to do some extra work if not following the conversion.

// POST: api/fcm/SendMessage
[Route("sendmessage")]
public async Task<IHttpActionResult> PostMessage(

but we can have complete custom method name with a http verb attribute as follows:

// POST: api/fcm/SendMessage
[Route("sendmessage")]
[HttpPost]
public async Task<IHttpActionResult> SendMessage(

For passing parameter, we can get value from request body in one of the following ways:

• the parameter is an instance of a business class with a FromBody attribute

Using this approach, we can send http requests with application/json as content type, and json string as request body

{ "FirstName": "John", "LastName": "Smith" }

• the parameter is an instance of FormDataCollection, then we can fetch data from it, say form["lastName"]

Using this approach, we can send http requests with x-www-form-urlencoded as content type, and request body like the following:

FirstName=John&LastName=Smith

For details, see https://www.infoworld.com/article/3136743/how-to-pass-multiple-parameters-to-web-api-controller-methods.html.