Once a Web API service is made public, different client applications start using our Web API services. As the business grows and requirements change, we may have to change the services as well, but the changes to the services should be done in way that does not break any existing ... Read More

The HTTP verbs comprise a major portion of our “uniform interface” constraint and provide us the action counterpart to the noun-based resource. The primary or mostcommonly-used HTTP verbs (or methods, as they are properly called) are POST, GET, PUT, PATCH, and DELETE. These correspond to create, read, update, and delete ... Read More

A public method in a controller is called an Action method. Let us consider an example where DemoController class is derived from ApiController and includes multiple action methods whose names match with HTTP verbs like Get, Post, Put and Delete.Examplepublic class DemoController : ApiController{    public IHttpActionResult Get(){     ... Read More

Filters are used to inject extra logic at the different levels of WebApi Framework request processing. Filters provide a way for cross-cutting concerns (logging, authorization, and caching). Filters can be applied to an action method or controller in a declarative or programmatic way. Below are the types of filters in ... Read More

Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin. A web application executes a cross-origin HTTP request when it requests a resource that has a different origin ... Read More

We can create our own custom class as a result type by implementing IHttpActionResult interface. IHttpActionResult contains a single method, ExecuteAsync, which asynchronously creates an HttpResponseMessage instance.public interface IHttpActionResult {    Task ExecuteAsync(CancellationToken    cancellationToken); }If a controller action returns an IHttpActionResult, Web API calls the ExecuteAsync method to create an ... Read More

The Web API action method can have following return types.VoidPrimitive Type/Complex TypeHttpResponseMessageIHttpActionResultVoid −It's not necessary that all action methods must return something. It can have void return type.Exampleusing DemoWebApplication.Models using System.Web.Http; namespace DemoWebApplication.Controllers{    public class DemoController : ApiController{       public void Get([FromBody] Student student){       ... Read More

When the ASP.NET Web API calls a method on a controller, it must set values for the parameters, a process called parameter binding.In order to bind a model (an action parameter), that would normally default to a formatter, from the URI we need to decorate it with [FromUri] attribute. FromUriAttribute ... Read More

The Task.WaitAll blocks the current thread until all other tasks have completed execution. The Task.WhenAll method is used to create a task that will complete if and only if all the other tasks have completed.If we are using Task.WhenAll we will get a task object that isn’t complete. However, it ... Read More

A file can be downloaded from a URL using web client. It is available in System.Net namespace.The WebClient class provides common methods for sending data to or receiving data from any local, intranet, or Internet resource identified by a URI.The web client can be said as an application or web ... Read More