How Do I Validate A Web API Model?

Can we return view from Web API?

An API controller is a controller which provides a RESTful response.

You cannot return a view from it.

A web API should return just information.

An HTTP response about what the action should do..

Why is Web API needed?

A web API can help you develop an ASP.NET application via AJAX. Using a web API framework, one can easily create services that can run on various entities. Hence, web API makes it easier for developers to build an ASP.NET application that is compatible with any browser and almost any device.

How do you handle exceptions in Web API?

Using exception filters in ASP.NET Web API. Exception filters are filters that can be used to handle unhandled exceptions that are generated in your Web API controller methods. In other words, you can use exception filters to catch unhandled exceptions in Web API that originate from your controller methods.

What is API request and response?

At its core, request–response is a message exchange pattern in which a requestor sends a request message to a replier system. The replier system receives and processes the request, and if all goes well, it returns a message in response.

How does Web API handle validation errors?

Handling Validation Errors Web API does not automatically return an error to the client when validation fails. It is up to the controller action to check the model state and respond appropriately. If model validation fails, this filter returns an HTTP response that contains the validation errors.

What is the default response format of a web API?

XML formatBy default Web API returns result in XML format.

How do I fix an API error?

To fix the API call for those two situations, make sure that the credentials you are using have the access-level required by the endpoint, or that the access token has the correct permissions. A less common reason we might see this error is if we’re not explicit about the Accept header value.

How do I get exceptions in Web API?

Web API provides us a great deal of flexibility in terms of exception handling. To recap: Use HttpResponseException or the shortcut methods to deal with unhandled exceptions at the action level. Use Exception Filters to deal with particular unhandled exceptions on multiple actions and controllers.

How do I create a response in Web API?

Depending on which of these is returned, Web API uses a different mechanism to create the HTTP response. Convert directly to an HTTP response message. Call ExecuteAsync to create an HttpResponseMessage, then convert to an HTTP response message. Write the serialized return value into the response body; return 200 (OK).

How do I use authentication on Web API?

To access the web API method, we have to pass the user credentials in the request header. If we do not pass the user credentials in the request header, then the server returns 401 (unauthorized) status code indicating the server supports Basic Authentication.

How do I return JsonResult in Web API?

Get ASP.NET Web API To Return JSON Instead Of XMLpublic static void Register(HttpConfiguration config){config.Routes.MapHttpRoute(name: “DefaultApi”, routeTemplate: “api/{controller}/{id}”, defaults: new.{id = RouteParameter.Optional.});//To produce JSON format add this line of code.More items…•

How do I check if a web API model is valid?

Is a technique, which can be applied on a model class for an ASP.NET Web API Application to validate the data and handle validation errors. It provides a pretty easy way to enable property-level validation logic within your Model layer. ASP.NET MVC 2 includes support for DataAnnotation attributes.

What is response type in Web API?

Web API converts request data into CLR object and also serialize CLR object into response data based on Accept and Content-Type headers. Web API includes built-in support for JSON, XML, BSON, and form-urlencoded data. It means it automatically converts request/response data into these formats OOB (out-of the box).

What is API format?

One computer has to put the data in a format that the other will understand. Generally, this means some kind of text format. The most common formats found in modern APIs are JSON (JavaScript Object Notation) and XML (Extensible Markup Language).

What is the biggest disadvantage of other return types in Web API?

What is the disadvantage of “Other Return Types” in Web API? Ans. The main disadvantage of this approach is that you cannot directly return an error code like 404 error.