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Discover the secret to simultaneously getting a web response and rendering a view in ASP.NET. Learn how to use Blazor WASM correctly with your existing API!
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How to Return Both A Web Response and A View in ASP.NET?

Navigating the intricate world of ASP.NET can sometimes lead to unexpected hurdles, especially when handling web responses and views simultaneously. It’s a common question among developers: How do we manage to fetch both a web response as JSON and render a view using Razor or Blazor? This blog aims to unravel that dilemma by exploring a practical solution to this problem.

The Problem

Imagine you’ve already set up a controller in your ASP.NET application with an action that successfully returns a JSON response for your servers. You also have a Razor page ready to display the server list. However, when you navigate to the Razor page, you're not receiving the expected JSON response. Instead, you're facing HTML output that seems to block your JSON response.

Here’s an outline of what the setup looked like:

API Controller Code:

[[See Video to Reveal this Text or Code Snippet]]

Razor Page Code:

[[See Video to Reveal this Text or Code Snippet]]

Blazor and Razor Page Integration:

[[See Video to Reveal this Text or Code Snippet]]

When attempting to navigate to the URL, instead of the JSON response you expect, your application renders an HTML document. This scenario led to confusion and frustration for many developers, especially for those trying to integrate Blazor with existing APIs.

The Solution: Use Blazor WASM

After further investigation and an update, it became clear that the solution lies in understanding the architectural differences between Blazor Server and Blazor WASM.

Key Insights:

Blazor Server:

Functions on the server side.

Requires constant connection with the server which makes it exclusive for generating HTML views rather than returning JSON responses.

Blazor WASM:

Runs client-side in the browser.

Makes it possible to call your API and fetch data (like the desired JSON response) while also allowing your views to continue rendering.

A Simple Guide to Implementing Blazor WASM:

Create a New Blazor WASM Project:
Use the command prompt to scaffolding a new Blazor WebAssembly project and link it to your existing API.

Configure Your API Calls:
Modify your Blazor components to call your API endpoint and fetch the server data using HttpClient.

Render Your Data in the View:
Use Razor syntax to render the fetched server data dynamically in your Blazor components.

Conclusion

If you find yourself trying to combine a front-end with an already existing API in ASP.NET, remember to opt for Blazor WASM instead of Blazor Server. This small architectural decision can save you a significant amount of confusion and ensure that you get both a functional JSON response and a beautiful front-facing view on your application.

Feel free to reach out if you have further questions or need additional insights! Happy coding!