1. What is Blazor, and how does it differ from
traditional web development frameworks?
Answer: Blazor is a modern web framework from
Microsoft that enables developers to create interactive web applications using
C# and .NET instead of JavaScript. It has two hosting models:
- Blazor
WebAssembly: Runs in the browser via WebAssembly.
- Blazor
Server: Runs on the server, communicating with the browser in
real-time using SignalR.
Unlike traditional JavaScript frameworks (e.g., React or
Angular), Blazor leverages a single programming language (C#) for both client
and server development, simplifying the process for developers with .NET
expertise.
2. What are the key features of Blazor?
Answer:
- Component-Based
Architecture: Reusable UI components.
- Full-Stack
Development: Use C# for both front-end and back-end.
- Hosting
Options: Supports Blazor WebAssembly and Blazor Server.
- JavaScript
Interoperability: Call JavaScript when needed.
- Rich
Tooling: Integration with Visual Studio.
- Built-In
Security: Offers authentication and authorization features.
3. How do you deploy a Blazor application to Azure?
Answer:
- Prepare
the application for deployment in Release mode.
- Choose
the hosting option:
- Blazor
WebAssembly: Deploy to Azure Static Web Apps or Azure Storage.
- Blazor
Server: Deploy to Azure App Service.
- Configure
Azure resources for scalability and security.
- Monitor
the app using Azure Monitor or Application Insights.
- Implement
best practices such as HTTPS, caching, and auto-scaling.
4. What is SignalR, and how does it enable real-time
communication?
Answer: SignalR is a library for adding real-time web
functionality to applications. It establishes a persistent connection between
the server and clients, enabling bidirectional communication. SignalR uses WebSockets
when available and falls back to other technologies like Server-Sent Events
(SSE) or Long Polling. It is often used for chat apps, live dashboards, and
collaborative tools.
5. What are the differences between SignalR and
Server-Sent Events (SSE)?
Answer:
Feature |
SignalR |
Server-Sent Events (SSE) |
Communication |
Bidirectional |
Server-to-Client only |
Transport |
WebSockets, SSE, Long Polling |
HTTP only |
Scalability |
Supports scaling with Redis, Azure |
Limited scalability |
Use Cases |
Chats, games, real-time tools |
Simple live updates (e.g., news) |
6. Explain how WebSocket works and its use cases.
Answer: WebSocket provides full-duplex communication
between a client and a server over a single, persistent connection. The process
includes:
- Handshake:
Starts as an HTTP request and switches to WebSocket protocol.
- Persistent
Connection: Keeps the connection open for ongoing communication.
- Bidirectional
Messages: Enables both client and server to send messages
independently.
- Use
Cases: Real-time apps like chat systems, stock price updates,
collaborative tools, and gaming.
7. When should you choose Blazor over frameworks like
React or Angular?
Answer:
- Use
Blazor: When you're leveraging a .NET ecosystem, prefer using C# for
full-stack development, or building enterprise apps tightly integrated
with Azure.
- Use
React: For dynamic, interactive UIs or apps that may extend to mobile
(React Native).
- Use
Angular: For large-scale apps requiring an all-in-one solution with
strong TypeScript support.
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