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Learn how to fix the `Duplicate 'Content' items were included` error in MongoDB Driver version 2.14.1 by upgrading to the latest version.
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Fixing the Duplicate 'Content' Items Were Included Error in MongoDB Driver for .NET

When working with the MongoDB Driver for .NET in a shared project, developers might encounter a common yet perplexing issue after updating packages: the error message stating that "Duplicate 'Content' items were included." This issue can arise due to version conflicts or changes in how .NET SDK handles project files. In this guide, we'll dive deep into understanding this problem and outline steps you can take to resolve it effectively.

The Problem

After upgrading your MongoDB NuGet packages from version 2.13.3 to 2.14.1, you may find yourself facing the following build error:

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

This error suggests that the .NET SDK is trying to include multiple instances of the same content files, resulting in a conflict during the build process. Specifically, it mentions several files related to native libraries, such as libzstd.dll and libsnappy64.so, that have been duplicated in your project.

Project Setup Overview

To understand why this issue occurs, let’s first review the project setup that typically leads to this error:

Backend Project: This project uses MongoDb.Driver and MongoDb.Driver.Core NuGet packages.

Shared Project: This is where the Mongodb.Bson package is referenced, which is also used in the backend project.

This dual setup can sometimes lead to conflicts when upgrading packages, particularly when the libraries involved introduce or change their handling of content files.

The Solution

Fortunately, there are steps you can take to resolve this issue. The easiest and most straightforward solution is to upgrade to a later version of the MongoDB Driver. As indicated, the version 2.18.0 appears to solve the error. Here’s how you can proceed:

Step-by-Step Guide to Fix the Error

Upgrade the MongoDB Driver: Open your NuGet package manager and upgrade the MongoDB packages to at least version 2.18.0. This version resolves the duplication issue and ensures compatibility with the .NET SDK.

Open the Package Manager Console and run the following command:

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

Clear NuGet Cache: Sometimes, old cached packages can still interfere with your project. Clear the NuGet cache by running:

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

Rebuild Your Project: After upgrading, rebuild your project and see if the error persists. If all goes well, your project should compile without any issues.

Check for Other Dependencies: If you still encounter problems, check if other NuGet packages in your project may need upgrades or if there are any specific package conflicts that need addressing.

Consider Setting a Property in Project File: If you are working with specific content files, you can also manually adjust your .csproj file. As the error message suggests, you can add a property to prevent default content items from being included:

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

However, use this option only if you're aware of your content files as it might lead to other issues if not managed correctly.

Conclusion

The Duplicate 'Content' items were included error in MongoDB Driver for .NET can be frustrating, but it can be easily resolved by upgrading to the latest version of the MongoDB packages. By following the steps outlined above, you should be able to overcome this issue and get back to developing your project without further interruptions.

If you continue to face challenges, don't hesitate to engage with the MongoDB community forums or GitHub for additional insights and assistance. Happy coding!