C# Web API Tutorial | What Is Web API in C#? | C# Tutorial | C# Programming Tutorial | Simplilearn

hey everyone i am vabra vanderwaal and i welcome you all to yet another exciting video from simply learns youtube channel today we will talk about one of the interesting topics that are c-sharp web api but before we begin let me tell you guys we have our daily updates on multiple technologies so if you are a tech geek in a continuous hunt for the latest technological advancement then consider getting subscribed to our youtube channel and don't forget to hit the bell icon below so you never miss an update from simplylaunch youtube channel now without any further ado let's get started with the agenda for today's session in this tutorial we will first define web api then we will look at what an asp.net web api is for following that we will go over some of the features of the c sharp web api after that we will look at some versions of the c sharp wave api then we will discuss the differences between c sharp wave api and c sharp wcf following that we will look at some of the benefits of using c-sharp web api finally we will make a web api project to further demonstrate the features of c-sharp web api now without any further ado let's get started with the first topic and try to understand what a web api is an application programming interface is a set of subroutine definitions protocols and tools for developing software and applications in computer programming api is an interface with a set of functions that allow programmers to access specific features or data on an application operating system or other services as the name implies web api is a web-based api that can be accessed via the http protocol it is a concept rather than a technology we can create web apis using various technologies such as java dotnet and others for example twitter's rest api provides programmatic access to read and write data allowing us to integrate twitter's capabilities into our applications we will now look at asp.net web api and after understanding what a web api is the asp.net web api is an extensible framework for creating http based services that can be accessed in various applications on various platforms such as web windows or mobile etc it functions similarly to an asp.net mvc web application except it sends data as a response instead of an html view it functions similarly to a web or wcf services except it only supports the http protocol we will now look at some of the characteristics of a c-sharp web api after understanding what it is the first feature of asp.web api is the asp.net web api platform is ideal for developing restful services second the asp.net web api is based on asp.net and supports the asp.net request response pipeline http verbs are translated into method names by asp.net web api the following features of asp.net web api are the asp.net web api accepts a wide range of response data formats json xml and bs on format support is preinstalled the fourth characteristic is iis self-hosted or any other web server that supports dotnet 4.0 or higher can host asp.net web api finally the last characteristic is the asp.web api framework includes a new http client for communicating with the web api server http client can be used on the server side of asp.net mvc and windows form console labs and other apps next we will discuss c sharp web api versions the first version of web api is web api 1.0 it supports dotnet framework 4.0 then it coincides with asp.net mvc4 and finally it supported the 2010 visual studio version the second version of asp.net web api is the web api 2.0 which we are currently using the dotnet framework it supports is dotted framework 4.5 and it is compatible with asp.net mvc5 and the visual studio 2012 and 13. following that we will look at the differences between asp.net web api and wcf which stands for windows communication foundation the windows communication foundation wcf formerly indigo is a free and open source runtime and set of apis in dotnet framework for developing connected service oriented application the first difference between web api and wcf is that web api is open source and includes the dotnet framework whereas wcf does not the second distinction is in web api the http protocol is supported whereas the wcf support the http tcp udp and custom transport protocol the following distinction that web api supported the mapping of http verbs of methods whereas wcf did not it is attribute based programming model that is being used the fourth distinction is that with asp.net mvc asp.net use a routing and a controller concept and wcf contracts for service operation and data the next difference is that the baby pi does not support reliable messaging or transaction whereas wcf supports reliable messaging and transaction the next distinction is in web api the html configuration class can configure web apis but not web whereas in wcf use of web to set as of service configuration and attributes the final difference is that wave api is ideal for creating restful services whereas restful services are supported in wcf but with limitations next we will look at when to use windows communication foundation the first reason is that if you are using dotnet framework 3.5 then we use wcf this api is not compatible with dotnet 3.5 or lower next we select wcf when using wcf if your service needs to support multiple protocols such as http tcp and named pipes following that we choose wcf if you want to build services that adhere to ws star standards like reliable messaging transaction and message security finally if you want to use the request reply one way or duplex message exchange patterns then we go with wcf following that we will look at when to use asp.net web api in this tutorial so the first reason to use web api when selecting web api is if you are using dotnet framework 4.0 or higher the second reason to use web api is when web api is the way to go is if you only want to build a server that supports http protocol when creating restful or http based services we choose asp.net web api the final reason to use asp.net web api is when we are choosing web api which is similar to asp.net mvc now we will look at the practical demonstration of c sharp web api we will start by creating a new project we will use asp.net core wave api we will name it emp api next we will use dotnet 5.0 and create then we will install a nuget package called microsoft dot entity framework or dot sql lite package so we will go to manage and you get package we will browse microsoft entity framework or sqlite we will install the latest version which is compatible with our 5.0 and install we will press ok accept and here the package install we can check it in the dependency framework and packages now let's get started with the coding first we will create a model folder to store the schema for this project so we will right click on emp api and then we will add a new folder called models then first we will create a class file so add class it will be a class and we will name it employee add we will start by creating different properties first we will create a public and emp id and we will get space set this will be a unique identifier so we will decorate it with key this key needs a special directory we will add system dot component model dot data annotations then we will add other properties such as public string name get and set then another one public string department and get set and another one for the address so public print address okay and set now the entity framework core also requires a contest object class a context object allows querying and saving data so we will make another class in models folder so we will add class and we will name it employee context here we will first inherit the db context now we will write an object which will be the configuration for the this context so public employee context db context options employee context options this will inherit the base class options we will write database dot ensure created this will ensure that the database is created through db context now we will acknowledge the db set so public db set employee employees get and set now we will update the configure services in startup.cs so we will go start of cs but first of all we will delete this by the forecast files and this weather forecast controller since they might interfere with our project later on so in the startup.cs we will go to the configure services here we will add services dot add db context employee context then in bracket o equals to greater than o dot sqlite data source equals to employees.db with this the entity framework is done now we will make a repository a repository is an abstraction layer between our application and data access layer which is in our case the employee context so now we will create a new folder and name it repositories we will add an interface in this we'll name this interface as i emp repository and add this interface will represent the operations which we will be performing on the database so we will start with task i inaudible employee okay this task will retrieve all the employee entries in the system now another task employee that with an argument and emp id this will retrieve a particular employee entry now let's write a task to create an entry so task employee create with argument as employee employee this will create the entries now task employee now update employee this will update the current entries and at the last we will add task delete and an argument amp id now we will create a class employee repository to add implementation to these approaches so add a class and we will name it employee repository now this employ repository will inherit interface i e and p repository we will implement this interface we will write a public employee repository employee context contest and we will have underscore context equals to context now we will write implementation for the create method underscore context dot employees dot add employee and then we will add a bet method so await context dot save changes pressing and we will add a same keyword here so and now we will return employee now let's write code for delete first we will use findsync method of db set to find the entry so var employee to delete well equals to await underscore context dot employee dot find a sink for emp id now we will use remove method of dbset to delete this entry so context dot employees dot remove employee to delete then we will update underscore context dot save changes async and we will add sn keyword to this now we will write get function here we will use two list assigned method of db set to show all the entries so we will just write return await underscore context dot employees dot to list async and we will add async keyword now we will write get matter with an argument so now we will use find ascend method to find the specific entry so we will write return await underscore context dot employees dot find async with an argument emp id and we will add sn keyword in this task as well now we will write update function so context dot entry of employee dot state is equals to entity state dot modifier then i will avoid context dot save changes async and we will add async now let's update the configure services in startup cs again so here i will write services dot add scope i e mp repository coma employee repository and with this the repositories are also finished now we will create a web api controller an api controller is a class that is responsible for handling requests at endpoints so let's close all these files now let's go to controllers and add a controller this will be an api controller which will be empty and we will add api controller empty and we will name it employees controller dot cs here this root method defines the path where this program will end and a controller is inherited from controller base so now since this controller will need an instance of book repository to interact with database so we will write public employees controller and give it the i emp repository appear repository we will also add the repositories now we will create a repository now we will inject the book repository in this constructor now let's write methods which will handle specific http request and these methods are called action methods we will start with a decoration tag http cat public async task hi innumerable employee that employee and i will return await underscore emp repository dot duplicate here we are using get method to get employee data from employee repository now let's create new method also called getbox we will decorate it with an http tag yet but this time with an argument in curly braces which is our emp id so public async task action result employees and new method get employees with the argument as and emp id and we will return await underscore emp repository dot get for emp id now let's implement a posting method for an employee entry this will create an employee entry in the database so we will have an http post decoration to it this means it will handle all post related http requests so we will start with public async task action result employees post employees which will take from body which will be employee conclude so now we are new employee will oppose to await dot underscore emp repository dot create in bracket employee now we will use the create method to add the employee entry so we will return with created at action in bracket name of cat employees comma new amp id equals to new employee dot emp id comma new employee now let's write a method to update an existing employee entry so this time we will decorate the http with post repeat now let's write a method to update an existing employee entry so we will have an http tag for put now public async task action result and put employees with argument as and amp id comma then from body it will take the data set employee now we will have to make sure that argument emp id is the same as the one in payload otherwise it will return a bad request so we will check it by if emp id is not equals to the employee dot empid then we will return a bad request otherwise we will avoid underscore emp repository dot update employee and we will return no content now let's write a method to delete the employee entry so this time we will decorate it with http delete this decoration will also have an argument in curly braces it will has an emp id so now public async task with action result delete argument and emp id first we will check if the employee entry is existing in the database or not so var employee to delete is equals to update underscore emp repository dot get emp id now if it is not found then we will return not found so if employee to delete is equals to null then we will return not found otherwise we will delete that entry so a wait underscore empld dot delete with the argument as employee to lead dot emp id and then we will return no content let's try and execute this as you can see here are all the functions now let's try to run get so we will try it out and execute as you can see it has no set so now let's try and insert something let's try out we will give it the one for the name we will try josh for department we will use id and for address let's use las vegas let's execute it it is working right now let's try to again check and here it is it has been recorded now let's try to to add another value so now we will change this emp to to name to rahul department engineering and address to be india let's execute this now let's try to get this and here it is we have two entries now let's try the put method this will update the values so let's try here let's update the entry number two we will copy this data from here and replace it with this now let's change the address from india and write it modifying as new delhi now let's execute this and let's try the get method for this particular number so number two and execute and here it is it has changed we can also try it in our initial get method we'll execute it and here it is also changed now let's try to use a delete method we will use try it out and we can delete number two now let's execute and it has worked success now let's try to access these entries so execute and here it is we are only getting the first emp id equals to one and that's all for this demo let's get back to our slide and this was all for today's session hope you guys found it informative and helpful if you liked this session then like share and subscribe if you have any question then you can drop them in the comment section below thanks for watching and stay tuned for more from simply learn hi there if you like this video subscribe to the simply learn youtube channel and click here to watch similar videos turn it up and get certified click here

Channel: Simplilearn

Views: 37,752

Keywords: c# web api tutorial, what is web api in c#?, what is web api, c# web application, c# api development, c# api tutorial for beginners, c# unity game development, c# fundamentals for absolute beginners, web application c# tutorial, learn c# for unity, what is an api, what is an application programming interface, web api tutorial, learn c# web development, introduction to web api, web api, csharp, c# unity, c# training, c# tutorial, simplilearn c#, simplilearn

Id: Ic_bviHY3Qo

Length: 64min 56sec (3896 seconds)

Published: Wed Feb 02 2022