React Native重写Xamarin应用：能否复用.dll硬件通信库及跨端封装咨询

Hey there! Let's break down your questions clearly since you're migrating from Xamarin to React Native and want to reuse that existing Bluetooth .dll library.

核心结论 #

You can't directly use the Xamarin .dll in React Native out of the box, but you can indirectly reuse its Bluetooth logic via Native Modules—though you'll need separate implementations for iOS and Android, since the two platforms handle .NET code completely differently.

1. Why can't we just use the .dll directly? #

• Xamarin's .dlls are compiled for the .NET/Mono runtime, while React Native's native layers rely on platform-specific runtimes: Android uses ART (Android Runtime) with Java/Kotlin, iOS uses its own native runtime with Objective-C/Swift. These runtimes don't speak the same language—RN has no way to load or execute .NET bytecode directly.
• Even on Android, Xamarin runs on a Mono VM that's separate from the Android ART runtime; there's no straightforward way to bridge them for RN.

2. Can we wrap the .dll with a React Native Native Module? #

This depends entirely on the platform:

For Android #

• You can't wrap the .dll directly, but you can repurpose the logic. Options include:
  • Rewrite the Bluetooth communication logic from the .dll into Android native code (Java/Kotlin), then build a RN Native Module around that.
  • Use Xamarin.Android to compile the .dll's core logic into an Android Archive (AAR) file—this is a native Android library format. Then, you can import this AAR into your RN Android project and write a Native Module to call its APIs.
  • If the .dll's code is pure .NET, you can use .NET for Android (the successor to Xamarin.Android) to compile it into a native-compatible library that your RN Native Module can interface with.

For iOS #

• This is trickier because iOS doesn't allow the Mono runtime (it's blocked by App Store rules). Xamarin.iOS works by AOT-compiling .NET code into iOS native machine code, so the original .dll itself is useless here. Your options:
  • Rewrite the Bluetooth logic from the .dll into iOS native code (Objective-C/Swift), then build a RN Native Module around that implementation.
  • Use .NET MAUI to compile the core Bluetooth logic into an iOS Framework (a native iOS library format), then integrate that Framework into your RN iOS project and wrap it with a Native Module. Just make sure the compiled Framework follows App Store guidelines—test early to avoid rejection.

3. Final Recommendations #

• Android: Prioritize either rewriting the logic to native Android code or compiling the .dll into an AAR for easier RN integration.
• iOS: Plan to rewrite the Bluetooth logic to native iOS code if possible—it's the most reliable path for App Store compliance.
• Alternatively, consider ditching the .dll entirely and using a mature React Native Bluetooth library like react-native-ble-plx to rebuild the communication layer. This fits better with RN's ecosystem and avoids all the cross-runtime headaches.

内容的提问来源于stack exchange，提问作者rakete