Asp net core web api tutorial

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  1. ASP.NET Web API is a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. It is an ideal platform for building RESTful applications on the.NET Framework. This poster shows how an HTTP request flows through the Web API pipeline, and how the HTTP response flows back.
  2. Web Api Tutorial C# Pdf. Step 3 − In the middle pane, select ASP.NET Web Application. Enter project name WebAPIDemo in the Name field and click Ok to continue. You will see the following dialog, which asks you to set the initial content for the ASP.NET project.

Creating Web API Application using Visual Studio

In this article, I am going to discuss the step by step procedure for Creating Web API Application. Please read our previous article before proceeding to this article where we gave an overview of the ASP.NET Web API framework. As part of this article, we ate going to discuss the following pointers.

  1. How to Create an ASP.NET Web API application using Visual Studio?
  2. Understanding the Folder structure and Auto-Generated Code in Web API Application.
  3. Understanding the Web API Controller.
  4. What is GET, POST, PUT and DELETE Http Verbs in Web API?
  5. Understanding the WebApiConfig in ASP.NET Web API Application.
  6. Understanding the Request Verbs, Request Header, Request Body and Response Body.
Creating Web API Application using Visual Studio:

First, open the Visual Studio and then selectFile => New Projectas shown in the below image.

In the “New Project” window Select “Visual C#” under the “Installed – Templates” and From the middle pane select theASP.NET Web Applicationand name the project as “FirstWebAPIDemo” and then click on the “OK” button as shown in the below image.

Once you click on theOKbutton, then a new window will open with NameNew ASP.NET Projectfor selecting project Templates and from that window select theWeb API project template and click on theOKbutton as shown in the below image.

Once you click on the OK button, It will take some time to create the project for us.

Understanding the Folder Structure of Web API Application:

If you have worked with ASP.NET MVC Framework, then the project folder structure should be familiar to you as shown below.

Here, we have separate folders for Models, Views, and Controllers and moreover, within the Controllers folder, we have both MVC as well as Web API Controller as shown in the below image.

The important thing to keep in mind is that the Web API Controllers are different from MVC Controllers. In our example, the ValuesController is WebAPI Controller.

If you observe the aboveValuesControllerClass, then you will see that it inherits from theApiController class which is present insytem.web.httpnamespace.

Further, if you notice that theHomeControllerclass is an MVC Controller, which is inherited from theController class that is present inSystem.Web.Mvcnamespace as shown in the below image.

Here we are going to focus on the Web API controller (i.e. Values Controller).

Notice that in the ValuesController we have methods such as Get, Put, Post and Delete that map to the HTTP verbs GET, PUT, POST and DELETE respectively as shown in below image.

We have 2 overloaded versions of the Get() method – One method without any parameters and the other one with the id parameter. Both of these methods respond to the GET HTTP verb depending on whether the id parameter is passed or not in the URL.

Now let’s look at the default route for our Web API project. We have the Application_Start() method within the Global.asax file. This method is executed when the application starts for the first time. In the Application_Start() method we have the configuration for Filters, Bundles, etc. as shown below.

The one that we are interested in here is the configuration for our Web API project, which is in WebApiConfig.Register() method. So right-click on the WebApiConfig.Register method and then select the “Go To Definition” from the context menu which will take you to the Register() method of the WebApiConfig class as shown below.

This class is in the App_Start folder.

You can see a default route is configured within the Register() method for our Web API project. The Web API routes are different from the MVC routes. You can find the MVC routes in RouteConfig.cs file which is present in the App_Start folder.

The default route in Web API starts with the word API followed by a / and then the name of the controller and then another / and an optional id parameter as shown below.

“api/{controller}/{id}”

At this point, if you use the following URI in the browser, you will get an error stating – Authorization has been denied for this request.

http://localhost:xxxxx/api/values

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To get rid of this error, comment Authorize attribute on the ValuesController class. This is related to security which we will discuss in a later article.

Now if you issue the URIhttp://localhost:xxxxx/api/values in the browser, then you should see the following XML as the result

Let us understand what is going on here.

The name of the controller is “values“. So if you issue a URI http://localhost:portnumber/api/values, then the Web API Framework is going to look for a controller with name Values + the word controller i.e. ValuesController in your application.

So if you have specified values in the URI it is going to look for ValuesController, if you specify Products, then it is going to look for ProductsController.

In a real-world application, this might be the domain name, for example, http://dotnettutorials.net/api/values The browser is issuing a GET request which maps to the Get() method in the ValuesController class. The GET() in the values controller is returning value1 and value2 which is what we see in the browser.

We have another overload of GET() method within the Values Controller which takes the Id parameter. If you remember with the default route within the WebApiConfig file, we specified the id parameter is optional. This is the reason why we are able to call the GET method with or without the Id parameter. So, if you specified the id parameter in the URI, then, the Get() method with the id parameter in values controller is going to be called

If a controller with the specified name is not found by the Web API Framework, then the Framework will an error. For example, in our application, if we comment “ValuesController” class in our project and then use the URI /api/values then you will get the following error

No HTTP resource was found that matches the request URI ‘http://localhost:15648/api/values’. No type was found that matches the controller named ‘values’.

Let’s discuss about POST, PUT and DELETE.

In a database table row, we can perform the following 4 actions

From the ASP.NET Web API point of view, these 4 actions correspond to GET, POST, PUT and DELETE verb as shown below

Web Api Tutorial Pdf Tutorialspoint

Let us discuss some terms and concepts which are related to HTTP request and response.
Request Verbs:

The HTTP verbs such as GET, POST, PUT and DELETE describe what should be done with the Web API resource. For example, do you need to read, create, update or delete an entity? The HTTP Verbs GET, PUT, POST and DELETE are the most commonly used verbs in real-time applications. For the list of the complete HTTP verbs, please check the following URL

Request Header:

When a client sends the request to the server, the request contains a header and a body. The header of the request contains some additional information such as what type of response the client required. For example, the client wants the response to be in XML or JSON format.

Request Body:

The Request Body contains the data that you want to send to the server. For example, a POST request contains the data in the Request Body for the new item that you want to create. The data may be in the form XML or JSON.

Response Body:

The Response Body contains the data that is sent as a response from the server. For example, if you request a specific employee, then the response body includes the employee details either in the form of XML or JSON.

Response Status codes:

The Response Status Codes are the HTTP status codes that will specify the status of the request. The most common status codes are 200/OK, 204/No Content, 500/Internal Server Error, 404/Not Found. If you want to see the complete list of HTTP status codes then please follow the below

To perform the GET, POST, PUT & DELETE actions, we will use a tool called Fiddler. You can download fiddler from the following link

Modify the ValuesController as shown below, so that it can support POST, PUT and DELETE actions.

At the moment the Post(), Put() and Delete() methods in the ValuesController are returning void. That is the reason why we are getting the status code 204 No Content. In ASP.NET Web API, an action method that returns void will send the status code 204 No Contentby default, but we can control this behavior which we will discuss in a later article.

In the next article, I am going to discusshow to use Swagger in WEB APIto document and test ASP.NET Web API services. Here, in this article, I try to explain creating Web API Application step by step with an example. I hope you enjoy this article.

Microsoft ASP.NET Web API framework is the best choice for developing HTTP services in more simpler way. It enables us to reach more wider ranger of clients such as browsers as well as mobile devices.In one of my previous web development tutorial about building RESTful service, I explained that the purpose of HTTP is not just acting as a transport layer (for example, in case of SOAP-based WCF service). However, its a very mature platform for developing Web APIs and utilizing its old simple concepts such as HTTP methods, HTTP status codes and URIs etc.

.net Core Web Api Tutorial Pdf

UPDATE: If you are interested further on ASP.NET Core and ASP.NET Core Web API, you can follow below:

More Practical Implementations using ASP.NET Web API are:

  • Developing an ASP.NET Web API Expense Management App with AngularJS
  • Creating your first SPA Application using AngularJS and Web API having all CRUD Operations.
  • Build a Full-Stack web app with ASP.NET Core, Entity Framework Core and Angular 2 & 4

Note: You can download a PDF version of the same “A Practical Guide to ASP.NET Web API” here.

So, we can say that using ASP.NET Web API, we can create HTTP services

  • those are non-SOAP based like plain XML or JSON string.
  • using full features of HTTP.
  • reaching broader range of clients (browsers and mobile devices).

Following is the typical ASP.NET Web API processing architecture.

You are designing an ASP.NET Web API application. You need to select an HTTP verb to allow blog administrators to moderate a comment. Which HTTP verb should you use?
  • A. GET
  • B. POST
  • C. DELETE
  • D. PUT

To further test your ASP.NET Web API skill, Take a Complete FREE Online Test or MCSD Practice Exam: 70-486 (Developing ASP.NET MVC Web Applications). Simply Click Here.

Correct Answer: D

Lets move forward to implement all the above mentioned related features step by step.

Web api tutorial pdf
  • Resources and URIs
  • HTTP Methods
  • HTTP Status Codes
  • HTTP Content
  • Internet Media Types
  • REST
  • JSON & XML

Chapter 1:- Developing your first ASP.NET Web API service
In chapter 1, we will be creating a simple HTTP service using Web API. A step by step approach is used while developing the service and getting results as:

  • Creating a Web API Project in Visual Studio
  • Preparing a Domain Model
  • Adding Controller
  • Finally testing results in browser.

Chapter 2:- Performing CRUD operations using ASP.NET Web API service – Part 1
As chapter 1 only focuses getting records using HTTP GET verb only, this chapter provides complete detail understanding of all CRUD (Create, Retrieve, Update, Delete) operations using Web API. Discussion about all related HTTP verbs i.e. GET, PUT, POST, DELETE is provided.

Web Api Tutorial Pdf Free Download

Chapter 3:- Performing CRUD operations using ASP.NET Web API service – Part 2
As we have already developed Web API service in previous chapter, here in this chapter, we will be consuming already created HTTP service using jQuery. Complete code snippet of jQuery for consuming a Web API service is given with detailed understanding of jQuery AJAX call.

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Chapter 4:- What’s new in ASP.NET Web API 2
Web API version 2 is released and this chapter briefly overview the top new features of ASP.NET Web API i.e.

  • Attribute Routing
  • Cross Origin Resource Sharing
  • Open Web Interface for .NET
  • IHttpActionResult
  • Web API OData
Chapter 5:- Model Validation in ASP.NET
Model in MVC framework is a representation of data structure. This Web API Tutorial focuses to understand and implement the data annotation technique for applying validation on a model class for an ASP.NET Web API application.

Web Api Sample Project

Chapter 6:- Exception Handling in ASP.NET Web API – Part 1
This chapter discusses about Exception Handling in ASP.NET Web API service. Instead of returning a generic status code i.e. 500 (Internal Server Error), a valid and meaning result should be sent back to client using HttpResponseException type.

Chapter 7:- Exception Handling in ASP.NET Web API – Part 2
To achieve the same purpose, as discussed in previous chapter, for more advanced scenarios: Web API provide Exception Fitlers and focus of the chapter is how to create an Exception Filter and return meaningful response.

Chapter 8:- ASP.NET Web API OData 5.3
Discussing in detail about features of Microsoft ASP.NET Web API OData 5.3 and 5.3.1 beta including:

  • Open Entity Type Support
  • Major Bug Fixes
  • Dynamic Collection Property in Open Type
  • More about flexibility to use $levels and $expand queries
  • Utilizing OData Core Libraries.

Extras:- Top 10 ASP.NET Web API Interview Questions
For a detailed and comprehensive list of Top 10 most important Interview Questions for Microsoft ASP.NET Web API that every Web Developer MUST Know.

Web Api Tutorial Kudvenkat Pdf

This collection of ASP.NET Web API Tutorial will definitely help developers to understand in more practical way.

Other ASP.NET Web API and Related Articles:

Api C# Tutorial For Beginners

Top 10 Interview Questions and Answers Series:

Web Api Tutorial Pdf C#

Build a Real-World App with ASP.NET Core and Angular 2 (4+)
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