Скачать или смотреть How to Load Dependencies DLLs in Xamarin Forms for Android and iOS

Learn how to effectively load DLL dependencies in Xamarin Forms applications to avoid `DllNotFoundException` errors. Discover solutions for packaging C+ + libraries into your Android APK and iOS IPA.
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Resolving DLL Issues in Xamarin Forms: A Guide to Loading Dependencies

Xamarin Forms is a powerful framework for building cross-platform mobile applications. However, developers often encounter challenges when it comes to loading dependencies, especially when they involve native libraries like C+ + . One common issue is the dreaded DllNotFoundException, which can be a significant roadblock in your development process.

In this guide, we will discuss a specific scenario where a Xamarin Forms solution runs into trouble due to missing C+ + DLLs and outline the steps to properly package and load these dependencies into your Android APK and iOS IPA.

Understanding the Problem

When working with Xamarin Forms, the typical project setup includes a shared logic layer, often implemented as a .NET Standard project. In our case, we have Project A, which references another .NET Standard project called Project B. Unfortunately, Project B has dependencies on C+ + DLLs, which are essential for executing certain logic.

Key Challenges

DllNotFoundException: This error occurs when the application cannot find the specified DLL during execution.

Native Libraries: Since Project B relies on C+ + DLLs, the challenge lies in properly integrating these libraries into the Xamarin project without building them natively for the target platforms (Android and iOS).

A Step-by-Step Solution

1. Verify DLLs

Before delving into packaging, ensure you have the correct DLLs provided by your third-party vendor. Having the right DLLs is crucial; an incorrect version will lead to further complications.

2. Add DLLs to Your Project

The next step is to ensure that the C+ + DLLs are referenced and included in your Xamarin project.

Android:

Place the DLL files in the appropriate folder (usually \libs for Android).

Right-click on the DLLs in the Solution Explorer and set the Build Action to AndroidNativeLibrary for each native library.

iOS:

For iOS, include the DLLs in your project by right-clicking on the project and selecting Add Existing Item.

Ensure the files are set to BundleResource in the file's properties.

3. Update your Build Configuration

Once the DLLs are added, make sure to check your build configurations.

Ensure that your configurations are targeting the correct platform (i.e., ARM for Android devices).

This step may require checking the Build tab for each project.

4. Handle Platform-Specific Code

In some scenarios, you might need to deal with platform-specific code to ensure that the application correctly identifies and utilizes the DLLs per platform.

Use conditional compilation to separate code sections if necessary.

Example:

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5. Testing

After packaging everything, thoroughly test your application in both the Android simulator and on actual iOS devices to verify if the DLLs are being correctly loaded and utilized.

Conclusion

After addressing the configuration and packaging requirements for the C+ + DLLs, things should function smoothly. The crucial takeaway here is to ensure you have the correct versions of your libraries and properly reference them in your project.

Ultimately, if problems persist with missing DLLs, double-check the paths, configuration settings, and ensure they are built correctly into your APK and IPA.

For our specific case, after receiving and integrating the appropriate DLLs from the third-party provider, everything worked as expected!

With these steps, you should now be well-equipped to handle DLL loading issues in your Xamarin Forms applications, ensuring a smoother development experience ahead.