Building Single Page Applications (SPA) with Blazor

 Introduction

Blazor is Microsoft’s modern framework that allows you to build interactive web applications using C# instead of JavaScript. With Blazor, you can create Single Page Applications (SPAs) where the UI updates dynamically without requiring full-page reloads — all while writing client-side logic in .NET. This blog explores how Blazor enables building SPAs and why it’s a powerful alternative for developers familiar with the .NET ecosystem.

What is Blazor?

Blazor is a web framework introduced by Microsoft that lets you build rich web UIs using C# and Razor syntax. It comes in two main hosting models:

Blazor WebAssembly: Runs client-side entirely in the browser using WebAssembly.

Blazor Server: Executes on the server and uses SignalR to update the UI in real time.

Both models allow developers to create SPAs where components dynamically render and update without reloading the entire page.

How Blazor Enables SPAs

Blazor uses Razor Components, which act like React or Angular components, to define UI pieces. Routing is handled client-side using the Router component, which maps URLs to pages or components without a server round trip.

For example, the App.razor file typically looks like this:

<Router AppAssembly="@typeof(App).Assembly">

    <Found Context="routeData">

        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />

    </Found>

    <NotFound>

        <LayoutView Layout="@typeof(MainLayout)">

            <p>Sorry, page not found.</p>

        </LayoutView>

    </NotFound>

</Router>

With this setup, navigation between pages is smooth and instantaneous, delivering a true SPA experience.

Benefits of Building SPAs with Blazor

✅ C# Everywhere: Write front-end and back-end code in the same language, reducing context switching.

✅ Reusable Components: Create modular, reusable UI components.

✅ Integrated with .NET: Leverage existing .NET libraries and tooling.

✅ Strong Typing: Catch errors at compile time instead of runtime.

✅ Productivity: Built-in dependency injection, routing, and form validation speed up development.

Conclusion

Blazor makes building SPAs with .NET technologies accessible, letting developers create modern, fast, and interactive web apps without relying on JavaScript-heavy frameworks. Whether you choose Blazor WebAssembly or Blazor Server, you can build professional-grade SPAs while leveraging your existing C# and .NET skills — all within the comfort of Visual Studio or your favorite .NET IDE.

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Read More:

Building a Web API from Scratch

Consuming APIs in ASP.NET Core MVC

ASP.NET Core vs .NET Framework

Integrating Angular with ASP.NET Core

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