Why do we need to choose Blazor for developing new webapplication development? So now we are going to discuss Blazor.

What is Blazor?

Blazor is a web technology in asp.net, which allowsprogrammers to build web UI using C# instead of using JavaScript, angular as a client-sidescripting language. Programmer can build Blazor app using C#, HTML, and CSS.

Blazor is single page application development framework,which is open-source and released by Microsoft. Blazor stands for two words,Browser and Razor. In Blazor, build a web app using C# which runs in a web browser.Blazor is the new version of the older Razor view with Web assembly features inasp.net. Using Blazor programmers can develop client and server-sideapplications.

When a developer uses Blazor for developing applications then the developercan use .NET technologies for front-end and back-end, there is no need to use anyother programming languages. It provides code reusability from server-side toclient-side and vice versa. Through Blazor it is possible to run code whereverwe want to run.

Blazor runs client-side or server-side both. Blazor can beused to run client-side c# code in the browser. Browser Web Assembly feature isused to run C# Blazor component in the browser. Blazor can also be used to run asserver-side Blazor components. Server-Side Blazor components use signalR (WebSocket) technology to communicate client with server real-time. Blazor serversupported in asp.net core 3.0 versions and now it supports in .NET 5 too.Blazor server and Blazor web assembly apps security scenarios are different.Blazor servers run on an app server, so it first checks authorization.

Blazor is cross-platform framework so it can also use todeveloper mobile application. The Razor component model is good feature todevelop web application and Blazor assembly improves the performance of Blazorapp. Basically, Blazor web assembly includes entire server and .NET runtime andruns it on top of WSAM.      Blazor webassembly is direct talking to DOM, it’s not talking to server over SignalR.

How to create Blazor APP?

Requirement for create Blazor app

1. Visual Studio 2019
2. .NET Core 3.1 SDK / .NET 5 SDK 

Step 1: Openvisual studio 2019 and select the Blazor server app and create a new project with the name as shown in figure.

Step 2: Somefiles are generated by a default project template. Open the NavMenu.razor file from the shared folder and add a navigation link.

Step 3: Configuredatabase

 We can use Entity frameworkcore (database first) , so we need to install Entity Framework Core and otherrelated packages. Open the NuGet package manager and install thefollowing packages in the project.

·       Microsoft.EntityFrameworkCore.SqlServer

·       Microsoft.EntityFrameworkCore.Design

·       Microsoft.EntityFrameworkCore.Tools

Step 4: Open the command prompt and select theproject folder and run the command as shown below. This command generates theclasses from the database first approach of Entity Framework Core.

After executing this command, the model folder is created in the project. In this folder class file is created and set connection string in the appsetting.json file.

Step 5: In the project add a newfolder with name Services. In this folder add a new interface withname IService.cs. And add crud methods.

Step 6: In this folder add a new class file with the name EmpService.cs. And add code as below.

Step 7: Registercontext class and service file in startup.cs file.

Step 8: Now,in the pages folderadd a new file and name it as CreateRazor.razor.

Step 9: Now,in the pages folderadd a new file and name it as EditEmp.razor.

Step 10: Now,in the pages folderadd a new file and name it as ListEmployee.razor.

Now run the application and load home page by default

Click on the Employee Datalink. This will navigateto the Employee Data Component as shown below

Click on the Create New link providedon top of the List of Employees. This will navigate to the add new  employee Component  and Click on the Save button without entering and data in component,the validation error will be shown as below

Enter valid data in the Create Product component and clickon the Save button, the record will be added

Click on Edit button on any of the row of the Employee Listcomponent and display edit employee component.

Update Employee data. Click on delete button and deleteselected row data.

Now we talk about what are advantages and disadvantages ofBlazor.

ADVANTAGES AND DISADVANTAGES OF BLAZOR

Blazor has its own advantages and disadvantage. Let’s reviewthem over here.

Advantages are as follows:

1)     Run .NET (C#) code directly in Web Browser:

This is theunique feature of the Blazor project that compiles a .NET application and runs in the browser.Until web assembly was announced, JavaScript was the standard language for browserlogic and as full-stack web applications. So back-end developers also need tolearn JavaScript.

With Web assemblywriting rich web client application using c# code and code run into web browserand use same validation code for all in-browser logic.

2)     Blazor is faster than JavaScript or jQuery:

Blazor ispre-complied into intermediary language before it is downloaded into clientbrowser using web assembly. Because of this pre-complied feature, server-side codeis deployed and run and make Blazor faster than JavaScript.

So, Developers candevelop performance-intensive applications like video gaming and augmentedreality apps using Blazor.

3)     Code sharing between client and server-sidevery effectively

Sometimes,we need to apply same validation code at both client and server-side.

For example, weneed to check entered username is existing or not as soon as they enter it,which will save a round trip to the server, for that we do the same validation at the server-side in case of the request to the server passed by client validation.

With Blazor, wecan write one class library with shared functionality then use this classlibrary as a reference for both client and server-side applications. So deployed samecode but without creating class twice. So, these features can save developerstime for write code.

4)     Blazor app can run offline too:

 Blazor app doesn’ttake too much network bandwidth because the server-side Blazor app does not passdata every time. Use the app without web support, once it is downloaded from the internet and there is no impact on speed. Also when some time network istemporarily down then app still work.

Disadvantages are as follows:

1)     Increase Payload data in the browser

Blazor projectsize is a minimum of 2.4 MB, because all server-side code is transformed at clientside which increases payload. That means if our code contains a few linesthen also files size in megabytes.

2)    Load Time:

Some times.it maybe happen, User has poor internet connectivity or does not have a standard webbrowser then they can get maybe irritated with load time.Because they havewait until web assembly is downloading and create static file at server-side.

3)     Limited options to check debugging capability:

 Client-side Blazorapp has a limited option with their own debugging tabs if our app has complexlogic which is hard to find out bugs then we may have write code for debuggingor put code into logging. So this is very time-consuming.