Скачать или смотреть Resolving the get_Info Implementation Error in Npgsql with .NET Core

Discover how to fix the common `get_Info` implementation error in Npgsql when using Entity Framework Core with .NET Core. Follow our step-by-step guide for a seamless experience.
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This video is based on the question https://stackoverflow.com/q/63980637/ asked by the user 'tolga' ( https://stackoverflow.com/u/577647/ ) and on the answer https://stackoverflow.com/a/63980801/ provided by the user 'tolga' ( https://stackoverflow.com/u/577647/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the get_Info Implementation Error in Npgsql.EntityFrameworkCore with .NET Core

When you're new to .NET Core, encountering errors while trying to set up your first WebApi can be frustrating. One common issue that developers face is the error message regarding the get_Info method in the NpgsqlOptionsExtension. If you've tried migrating your model to a PostgreSQL database, you might have seen this error:

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

If you're feeling stuck, don't worry. In this guide, we will guide you through understanding the cause of this error and the steps to resolve it, ensuring a smoother migration to PostgreSQL.

Understanding the Issue

The issue stems from a package version disagreement between Entity Framework Core and the Npgsql.EntityFrameworkCore.PostgreSQL library. Specifically, in your case:

You are using EntityFramework Core version 3.1.8.

However, you have installed Npgsql.EntityFrameworkCore.PostgreSQL version 2.1.0.

This version mismatch is what leads to the get_Info implementation error, as different library versions are trying to work together without proper compatibility.

Solution: Aligning Package Versions

To resolve the issue, the goal is to ensure that both your Entity Framework and Npgsql packages are on compatible versions. Follow these steps:

Check Current Package Versions: Review your .csproj file to identify the current versions of your packages.

Remove the Incompatible Npgsql Package: Start by uninstalling the current version of Npgsql that is causing the issue. You can do this with the following command:

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

Install the Correct Version: Next, install the version of Npgsql that corresponds to the version of Entity Framework Core you are using. Since your EF Core version is 3.1.8, you'll want to install Npgsql version 3.1.0:

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

Verify Your Setup: After installing, it's a good idea to ensure all your package versions are aligned. You can check with:

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

Run Your Migration Again: Finally, after the version adjustments, try running your migration command again:

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

Conclusion

By ensuring that all packages are compatible, you can prevent the get_Info implementation error from stopping your development process. With the proper versions in place, you should now be able to successfully migrate your model to the PostgreSQL database without any issues.

If you continue to encounter problems or have any further questions related to .NET Core and PostgreSQL, feel free to reach out. Happy coding!