Скачать или смотреть Resolving EF Core Database Migration Issues After Upgrade to 3.1

This guide guides you through resolving issues encountered during database migrations after upgrading Entity Framework Core from 2.1 to 3.1. Learn how to ensure smooth migration processes with updated libraries and tools.
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This video is based on the question https://stackoverflow.com/q/63579218/ asked by the user 'Joelty' ( https://stackoverflow.com/u/10522960/ ) and on the answer https://stackoverflow.com/a/63729902/ provided by the user 'lauxjpn' ( https://stackoverflow.com/u/2618319/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Database Migration Problems After Upgrading EF Core

Upgrading your software can often result in unexpected hurdles. If you’ve recently upgraded from Entity Framework (EF) Core 2.1 to 3.1 and found yourself unable to perform database migrations, you are not alone. Users have reported encountering several errors, particularly related to accessing services and determining application file paths. Let’s dissect the problem and provide clear solutions to get you back on track with your project.

The Core of the Problem

Upon executing the migration command, you might see an error that looks something like this:

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This indicates there is an issue with the compatibility or configuration of your EF Core libraries and tools post-upgrade. Let's break down the solution into manageable steps.

Step-by-Step Solution

1. Verify Your Project Structure

Before taking any drastic measures, ensure that your project structure is as you expect it to be. Your directory should be organized correctly, with the necessary files located in their respective folders. For instance:

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2. Check EF Core Versions

The inconsistency often arises from mixing and matching EF Core versions across different projects. You should check that all your EF Core libraries are updated to version 3.1.7. Here’s what you need to do:

Open each project file (e.g., *.csproj) and look for references to EF Core assemblies. These should include packages like Microsoft.EntityFrameworkCore, Microsoft.EntityFrameworkCore.Tools, and others relevant to your project.

Update any stale references to use the same version, 3.1.7.

3. Align EF Core Tools

Make sure that the EF Core Tools are also on the same version as your libraries. You can confirm this by running the following command in your terminal:

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Ensure you see output indicating that the tools version matches your EF Core libraries.

4. Execute Migration Command with Verbose Logging

After confirming that all versions are aligned, attempt to run your migration command again:

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Using the --verbose flag will help you get detailed logs that can uncover any lingering issues during execution.

5. Seek Additional Help if Needed

If you continue facing difficulties despite these checks, consider posting the contents of your project files and sharing any verbose output from the EF Core command. This additional context will help in diagnosing the issue more accurately.

Conclusion

Upgrading to new library versions can sometimes lead to compatibility challenges, but by ensuring all components are aligned and updated, you can resolve these issues effectively. Make sure to follow the above steps carefully and don’t hesitate to seek additional help from community forums if needed. Stay updated, keep your projects in sync, and happy coding!