# ASP.NET Core 6.0 Web REST API Patterns (not minimal api)

GET returns Task<ActionResult>

Example: GET: api/TodoItems

• GET without parameter returns a list of objects.

• Produce a Status 404 if items are not found, by using the NotFound() method

GET with ID param returns Task<ActionResult

Example: GET: api/TodoItems/5

• Mark method with [HttpGet("{id}")] to constrain route to match id

• Produce a Status 404 if item is not found, by using the NotFound() method

PUT with ID returns No Content as Task

Example: PUT: api/TodoItems/5

• Mark Method with [HttpPut("{id}")] to constrain route to match id

• Produce a Status 400 if Attribute doesn’t match parameter, by using the BadRequest() method

• Produce a Status 404 if item is not found, by using the NotFound() method

• Produce a Status 204 if successful, and nothing is returned, by using NoContent() method

POST with ID return ActionName as Task

Example: POST: api/TodoItems

• Mark Method with [[HttpPost] the HTTP body will be parsed and mapped to parameter

• Produce a Status 400 Bad Request, on empty or error, by using the Problem('why message') method

• Produce a Status 201, redirecting to where it’s created. e.g. location: http://localhost:23015/api/T/1 using the CreatedAtAction() method

• Example: CreatedAtAction(nameof (GetT), new { id = T.Id }, t);

• Use `nameof(T) instead of hardcoded string of the GET Method

DELETE with ID returns No Content as Task

Example: DELETE: api/TodoItems/5

• Mark Method with [HttpDelete("{id}")] to constrain route to match id

• Produce a Status 404 if item is not found, by using the NotFound() method

• Produce a Status 204 if successful, and nothing is returned, by using NoContent() method