Скачать или смотреть Resolving the DataProtectorTokenProvider Constructor Method Issue in .NET Core Migration

Discover how to fix the `DataProtectorTokenProvider` constructor method not found error when migrating from ASP.NET Core 2.2 to 3.1. Follow these simple steps to resolve your issues and continue your development smoothly.
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Understanding the Problem: DataProtectorTokenProvider Constructor Not Found

Are you encountering the frustrating DataProtectorTokenProvider constructor method not found error while migrating your application from ASP.NET Core 2.2 to 3.1? If you’ve been using custom token providers with Identity, you might have run into this issue recently. In particular, the error message suggests that ASP.NET is unable to resolve a service related to your UserManager.

What does this mean?

You are probably facing a problem where the constructor for DataProtectorTokenProvider is missing or not found, leading to exceptions when your application attempts to start up. This complication arises from differences in how the underlying libraries have been organized and updated in ASP.NET Core’s ecosystem between these two versions.

Analyzing the Cause of the Issue

From your investigation, it seems that after migrating, the DataProtectorTokenProvider class now requires additional parameters in its constructor, specifically an ILogger. This is different from the earlier version (ASP.NET Core 2.2), where it didn't require that parameter.

To summarize, here's what happens:

Old Version (2.2): Constructor required only IDataProtectionProvider and IOptions<DataProtectionTokenProviderOptions>.

New Version (3.1): Constructor signature has changed, now including ILogger.

This breaking change typically occurs when libraries are updated or restructured, which is not uncommon in rapid development frameworks like ASP.NET Core.

Steps to Solve the Problem

The solution to this issue is straightforward and can be achieved by modifying your project configuration in a couple of easy steps.

Step 1: Update the Project Dependencies

To resolve the problem, you need to shift your references from individual Microsoft.AspNetCore.* libraries to the shared framework. This means you will be using the Microsoft.AspNetCore.App framework reference, which bundles multiple libraries together for ease of use.

Here's how to update your project file (.csproj):

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

Step 2: Run Your Application

After making this change, rebuild your application and run it again. By using the shared framework, it should now resolve the DataProtectorTokenProvider and other identity-related services correctly.

Important Notes

Ensure that all your services refer to the correct namespace and that you have included all necessary packages in your application.

If additional errors occur, ensure to examine the error messages closely as they often provide guidance on what might be wrong.

Conclusion

Migrating between versions of frameworks can be challenging, especially when breaking changes occur. However, by updating your project to reference the Microsoft.AspNetCore.App framework, you can resolve issues related to the DataProtectorTokenProvider constructor method and enjoy the new features and performance improvements that ASP.NET Core 3.1 offers.

By following these simple steps, you can get your application back on track and leverage the upgrades in a newer environment. Happy coding!