1. Home
  2. /
  3. Blazor-wasm
  4. /
  5. Blazor Component with Timer

Blazor Component with Timer - Blazor-wasm Typing CST Test

Loading…

Blazor Component with Timer — Blazor-wasm Code

A component updating the time every second.

# blazor/demo/Timer.razor
<p>Current Time: @currentTime</p>

@code {
	private string currentTime;
	protected override void OnInitialized() {
		var timer = new System.Timers.Timer(1000);
		timer.Elapsed += (s, e) => {
		currentTime = DateTime.Now.ToString("HH:mm:ss");
		InvokeAsync(StateHasChanged);
		};
		timer.Start();
	}
}

Blazor-wasm Language Guide

Blazor WebAssembly (WASM) is a client-side web framework from Microsoft that allows developers to build interactive web applications using C# and .NET instead of JavaScript. Applications run directly in the browser via WebAssembly.

Primary Use Cases

  • ▸Interactive single-page applications (SPAs) with C#
  • ▸Line-of-business applications requiring .NET libraries
  • ▸Client-side applications with offline capabilities
  • ▸Web apps needing tight integration with ASP.NET Core backends
  • ▸Modern web UI replacement for WinForms/WPF apps

Notable Features

  • ▸Client-side execution using WebAssembly
  • ▸Component-based UI architecture
  • ▸Full access to .NET runtime libraries in the browser
  • ▸Integration with ASP.NET Core for API calls and authentication
  • ▸Support for dependency injection and routing

Origin & Creator

Blazor was developed by Microsoft, first introduced in 2018, with WebAssembly support added to enable fully client-side .NET applications.

Industrial Note

Blazor WASM is ideal for enterprises and developers invested in the Microsoft ecosystem who want C# web development without relying on JavaScript frameworks.

Quick Explain

  • ▸Blazor WASM enables full-stack C# development, running .NET code in the browser.
  • ▸Uses WebAssembly to compile .NET IL (Intermediate Language) into a binary format that browsers can execute.
  • ▸Supports component-based architecture, enabling reusable UI elements.
  • ▸Integrates seamlessly with .NET ecosystem, including libraries, dependency injection, and tooling.
  • ▸Runs entirely client-side, reducing server load and enabling offline capabilities.

Core Features

  • ▸Razor components for UI development
  • ▸Two-way data binding
  • ▸Event handling in C# instead of JavaScript
  • ▸JavaScript interop for accessing browser APIs
  • ▸Lazy loading and modular assemblies to reduce payload

Learning Path

  • ▸Learn C# and .NET fundamentals
  • ▸Understand Razor syntax and components
  • ▸Explore Blazor component lifecycle
  • ▸Integrate with ASP.NET Core backend
  • ▸Build sample SPA applications

Practical Examples

  • ▸To-do application with local storage
  • ▸Client-side dashboard with charts and API integration
  • ▸Form-based enterprise application
  • ▸Offline-capable PWA
  • ▸Interactive data visualization with Blazor components

Comparisons

  • ▸Blazor WASM vs React: Blazor uses C#, React uses JS/TS
  • ▸Blazor WASM vs Angular: Blazor SPA runs in .NET runtime, Angular compiles to JS
  • ▸Blazor WASM vs Vue.js: Blazor integrates with .NET ecosystem natively
  • ▸Blazor WASM vs Blazor Server: WASM runs client-side, Server runs on backend
  • ▸Blazor WASM vs JS frameworks: Strong typing and tooling with C#

Strengths

  • ▸Leverages existing .NET skills and libraries
  • ▸C# code runs natively in the browser via WebAssembly
  • ▸Component reuse between server-side and client-side Blazor
  • ▸Strong Microsoft tooling support (Visual Studio, CLI, debugging)
  • ▸Secure execution sandboxed in the browser

Limitations

  • ▸Initial download size can be large compared to JS frameworks
  • ▸Browser compatibility depends on WebAssembly support (modern browsers only)
  • ▸SEO is challenging without prerendering
  • ▸Limited ecosystem compared to JavaScript frameworks
  • ▸Client-side execution may not be ideal for CPU-intensive tasks

When NOT to Use

  • ▸Applications needing SEO without prerendering
  • ▸Very large-scale SPAs requiring minimal payload
  • ▸Browsers without WebAssembly support
  • ▸CPU-intensive client-side computations
  • ▸Projects without .NET developer expertise

Cheat Sheet

  • ▸dotnet new blazorwasm - create a new Blazor WASM project
  • ▸dotnet run - run project locally
  • ▸@code { } - define component logic in Razor file
  • ▸@inject - inject service into component
  • ▸NavigationManager.NavigateTo() - programmatic navigation

FAQ

  • ▸Is Blazor WASM free?
  • ▸Yes - open-source as part of .NET runtime.
  • ▸Does Blazor run on all browsers?
  • ▸Modern browsers with WebAssembly support are required.
  • ▸Can I use existing .NET libraries?
  • ▸Yes - compatible libraries can run in WASM.
  • ▸How is authentication handled?
  • ▸Via ASP.NET Core Identity, JWT, or external providers.
  • ▸Can Blazor WASM work offline?
  • ▸Yes - using PWA caching and local storage.

30-Day Skill Plan

  • ▸Week 1: C# and .NET basics
  • ▸Week 2: Razor components and data binding
  • ▸Week 3: API integration and DI
  • ▸Week 4: JavaScript interop and advanced components
  • ▸Week 5: PWA features and deployment optimization

Final Summary

  • ▸Blazor WASM enables client-side web apps using C# and .NET.
  • ▸Runs in the browser via WebAssembly with full .NET support.
  • ▸Component-based architecture allows reusable UI blocks.
  • ▸Integrates with ASP.NET Core for API, auth, and backend services.
  • ▸Ideal for .NET developers building SPAs without JavaScript.

Project Structure

  • ▸wwwroot/ - static assets (JS, CSS, images)
  • ▸Pages/ - Razor components mapped to routes
  • ▸Shared/ - reusable components and layouts
  • ▸Program.cs - application entry point and DI configuration
  • ▸_Imports.razor - global using directives
  • ▸App.razor - root component defining router and layout

Monetization

  • ▸Enterprise applications as SaaS
  • ▸Internal line-of-business tools
  • ▸Progressive web apps for clients
  • ▸Interactive dashboards and analytics portals
  • ▸Cross-platform web applications replacing desktop clients

Productivity Tips

  • ▸Reuse components across projects
  • ▸Use dependency injection for shared services
  • ▸Leverage existing .NET libraries
  • ▸Optimize lazy loading and bundling
  • ▸Use Visual Studio/VS Code productivity extensions

Basic Concepts

  • ▸Razor Component - UI element written in C# and Razor syntax
  • ▸Binding - two-way connection between UI and data model
  • ▸Event Callback - handles user interactions in C#
  • ▸Dependency Injection - inject services into components
  • ▸Routing - navigate between components in SPA

Official Docs

  • ▸https://learn.microsoft.com/en-us/aspnet/core/blazor/?view=aspnetcore-8.0
  • ▸https://dotnet.microsoft.com/apps/aspnet/web-apps/blazor

More Blazor-wasm Typing Exercises

Simple Blazor WebAssembly ComponentBlazor Component with Button ClickBlazor Component with Two-Way BindingBlazor Component with Conditional RenderingBlazor Component with LoopBlazor Component with Event CallbackBlazor Component with Cascading ParameterBlazor Component with Form ValidationBlazor Component with Nested Components

Practice Other Languages

CReactPythonC++RustTypeScriptKotlinPHPJavaC#RubyMqlCqlN1qlCypher