Скачать или смотреть How to Run an Angular SPA Application Within an Existing ASP.NET Core Application on the Same Domain

Learn how to integrate an `Angular SPA` application into your existing `ASP.NET Core` infrastructure, enabling smooth transitions and gradual component migration.
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This video is based on the question https://stackoverflow.com/q/77014014/ asked by the user 'Nabeel Iqbal' ( https://stackoverflow.com/u/2425015/ ) and on the answer https://stackoverflow.com/a/77041959/ provided by the user 'Qiang Fu' ( https://stackoverflow.com/u/20240963/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Run an Angular SPA Application Within an Existing ASP.NET Core Application on the Same Domain

Transitioning from an ASP.NET Core MVC application to an Angular single-page application (SPA) can be a challenging but rewarding process. If you're overseeing a substantial ASP.NET Core application and are looking to enhance your frontend capabilities with Angular, this guide is for you. In this guide, we'll explore how to successfully run your Angular application alongside your existing ASP.NET Core setup on the same domain.

The Challenge

Many developers face the challenge of not being able to convert their entire application to an Angular architecture all at once. Instead, they prefer to transition components gradually—developing and testing one piece at a time. This is particularly useful when:

You have a large codebase.

The application is already in production.

You want to minimize disruptions during the migration.

In this scenario, we need a viable approach that allows both the existing ASP.NET Core application and the new Angular SPA to coexist harmoniously on the same domain.

Solution Overview

To achieve this, you will need to ensure that both your Angular SPA and ASP.NET Core API can communicate efficiently within the same domain. Here's a step-by-step breakdown of the solution.

Step 1: Decide on the Proxying Approach

You have two primary options to enable seamless interaction between your applications:

Proxy the Angular Client to the ASP.NET Core API Port:

This approach uses the default Visual Studio Angular with .NET Core templates.

Proxy the ASP.NET Core API to the Angular Port:

This method requires the use of Ocelot—a lightweight API Gateway.

Step 2: Using Ocelot for API Proxying

If you choose the Ocelot approach, here's how you can set it up:

Install Ocelot:

You can easily install Ocelot via NuGet Package Manager. Just run the following command:

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

Create the Ocelot Configuration File:

In the root folder of your project, create a file named ocelot.json and add the following configuration:

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

Modify the Program.cs File:

You will also need to add Ocelot into your application's configuration. Open your Program.cs file and include the following lines:

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

Step 3: Testing Your Setup

Once you've completed the steps above, you should be able to run your ASP.NET Core application, access your Angular SPA, and communicate with your API seamlessly. You will use the API's domain and port to visit your Angular application, thus enabling interaction between components without issue.

Conclusion

Integrating an Angular SPA into your existing ASP.NET Core application on the same domain is an efficient way to enhance your application’s frontend capabilities while gradually transitioning between frameworks. By using Ocelot to manage API requests, you can ensure that both applications function correctly without disruption.

This step-by-step approach not only aids in smoother transitions but allows for iterative development and testing. Strive for incremental changes, and your migration process will be much smoother!

For further assistance, feel free to explore more about Ocelot or dive into Angular’s documentation. Happy coding!