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Discover how to solve the `Attribute routes with the same name 'upload' must have the same template` error in ASP.NET Core by applying unique names to your controller actions.
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Resolving the Attribute Routes Conflict in ASP.NET Core: Unique Naming for Controller Actions

ASP.NET Core developers often encounter routing issues when defining APIs, especially when creating multiple controllers with similar action names. One common error that arises is the "Attribute routes with the same name 'upload' must have the same template." This issue occurs because the routing system in ASP.NET Core requires that each unique route also maintains unique naming conventions for clarity and functionality.

This guide will guide you through understanding this error and how to resolve it effectively.

Understanding the Problem

In the ASP.NET Core framework, attribute routing allows developers to define routes directly on controller actions. However, when multiple actions share the same route name without having distinct templates, it leads to confusion for the routing system.

Example Scenario

Consider you have two separate controllers, UserTrustedPersonController and ImageFileController, both containing an UploadFile action defined with the same route name 'upload'. Here’s the relevant portion from both controllers:

UserTrustedPersonController

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ImageFileController

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As a result, ASP.NET Core throws an InvalidOperationException, stating the routes conflict because both actions share the same name (upload) and route template.

The Solution: Unique Action Naming

To resolve this issue, you need to differentiate the route names in the HttpPost attributes for each controller action. This can be achieved by renaming one of the actions to avoid duplication.

Step-by-Step Solution

Identify Conflicting Action Names: Locate the actions in both controllers that are sharing the same route name.

Rename the Action: Modify the Name attribute in one of the actions. For example, you can change the upload name in the UserTrustedPersonController to uploadx:

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

To:

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Test Your Application: After making the changes, run your ASP.NET Core application to confirm that the routing conflict has been resolved and the application behaves as expected.

Conclusion

By following these steps, you can effectively resolve attribute routing conflicts in ASP.NET Core applications. Always ensure that action names and routes are unique, especially when dealing with multiple controllers that might implement similar functionalities. This not only helps avoid runtime errors but also improves the overall clarity of your API design.

Implement these best practices, and your web applications will be more robust and maintainable. Happy coding!