How to Inject Values from appsettings.json into a URL in ASP.NET Core

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The Problem

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You need to create a URL for an HTTP GET request, and you'd like to inject values like feedKey and access_location into this string. Your goal is to have the final output look like:

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However, you want to retain the original structure of your URL in the configuration file for future flexibility and maintainability.

The Solution

The solution lies in utilizing simple string manipulation techniques to replace the placeholders in your URL with actual values from your application's logic. Let's take a step-by-step approach to implementing this solution within an ASP.NET Core controller.

Step 1: Inject Configuration using IOptions

To begin with, you inject your configuration settings into your controller using IOptions<T>.

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Step 2: Retrieve and Manipulate the URL

With your controller set up, you can now handle the URL replacement logic within an action method. Here’s how you can do it:

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Step 3: Results

When you call this endpoint, the method constructs the desired URL dynamically and sends it back. The output will be:

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Conclusion

Remember, as your application grows, these string operations can streamline how you handle configuration-driven logic. Happy coding!