Resolving Cannot create instance of type Error in .NET 6 Web API

Learn how to fix the `Cannot create instance of type` error in your .NET 6 Web API project, ensuring proper dependency injection and database seeding practices.
---

Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: Cannot create instance of type "" because one or more parameters cannot be bound to

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving Cannot create instance of type Error in .NET 6 Web API

If you’re diving into the world of .NET 6 and building your own Web API, you may encounter a frustrating error: Cannot create instance of type 'Hotelum.HotelsSeeder' because one or more parameters cannot be bound to. This issue often arises due to incorrect handling of dependency injection (DI) and mismanagement of the application’s database context. Let’s take a closer look at why this error occurs and how you can effectively solve it.

Understanding the Problem

You might receive the following message when trying to create an instance of HotelsSeeder to populate your database with necessary data:

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

Key Points:

The error indicates that the dependency injection container could not resolve the HotelsDbContext parameter required by the HotelsSeeder constructor.

Properly configuring services and utilizing scoped lifetimes is crucial for seamless database interactions.

Solution Breakdown

Step 1: Implement Dependency Injection Correctly

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

Step 2: Fix the Hotels Data Population

In your GetHotels() method, ensure that you’re adding Hotels objects to the list properly. Here's the revised method:

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

Step 3: Add Connection String Configuration

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

Conclusion

By following these steps, you’ll not only resolve the Cannot create instance of type error, but also enhance the overall robustness of your .NET 6 Web API application. Remember that properly managing your service lifetimes and ensuring that all required dependencies are resolvable is key to building reliable web applications.

Feel free to reach out if you encounter further issues or have any questions while developing your Web API. Happy coding!