Blazor Framework Crash Course

Jul 20, 2024

Blazor Framework Crash Course

Introduction

  • Essential fundamentals for building web apps with rich and interactive UIs using Blazor.
  • Developed by Alan Omary.
  • Blazor is a modern front-end web framework based on HTML, CSS, and C#.
  • Part of the .NET platform.
  • Enables building entire web apps from front-end to back-end using a single development stack.

Key Features

  • Component-Based Architecture: Reusable web UI pieces encapsulating rendering and event handling logic.
  • Render Modes: Server, client, or combination of both for best performance.
  • Blazor Hybrid: Build native mobile and desktop apps blending native and web technologies.

Project Setup

  • Use Visual Studio to create a Blazor web app project.
  • Project structure includes pages, components, and various configuration files.
  • Main files: Program.cs (entry point), wwwroot folder (static assets), appsettings.json (configuration settings), Components folder (app components), Pages folder (page files), and Layout folder (layout components).

Working with Blazor Components

  • Razor Files: Blend of HTML and C# for defining rendering logic.
  • Creating Components: Define using Razor syntax with HTML and C# code blocks.
  • Using Components: Add component tags in HTML with optional parameters for data binding.

Handling Events in Blazor

  • UI Events: Click, mouse, keyboard, form, and focus events.
  • Events are handled by attaching handlers to HTML elements or components.
  • Event handlers can include methods or lambda expressions for simple actions.
  • Examples: onclick, oninput, onmouseover, onkeydown, onfocus, and onblur events.

Data Binding

  • One-Way Binding: Data flows from code to UI.
  • Two-Way Binding: Data flows both ways (UI to code and code to UI).
  • Achieved using bind attribute.
  • Binding events can be customized (e.g., bind:event="input").

Render Modes in Blazor

  • Static Server-Side Rendering: No state maintained after initial load.
  • Enhanced Navigation: Allows for enhanced page transitions without full reloads.
  • Streaming Rendering: Renders parts of a page as data becomes available.
  • Interactive Server Rendering: Manages UI events via WebSocket connection.
  • Interactive WebAssembly Rendering: Client-side execution using WebAssembly runtime.
  • Interactive Auto Rendering: Initial server-side rendering with later client-side execution via WebAssembly.

CRUD Operations

  • Creating and Managing Data Models: Define data models for specific entities (e.g., Student model).
  • Use Visual Studio scaffolding to generate CRUD pages/components.
  • Database Integration: Connect Blazor app to a database (e.g., SQL Server).
  • Form Handling: Submit forms, validate input, and bind data using EditForm and related components.
  • Scaffolded Pages: Include create, read, update, and delete functionalities for data models.

Conclusion and Further Learning

  • Practice by building projects like a simple food menu web app in Blazor.
  • Refer to additional resources for detailed understanding and advanced features.

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