为何仅附加调试器时堆栈跟踪才含行号？Xamarin.Android崩溃上报疑问

Hey there! Let's break down your questions about missing line numbers in Raygun crash reports for your Xamarin.Android Release builds.

Why do line numbers only show up when a debugger is attached? #

When you attach a debugger to your app, a few key things happen that make line numbers appear:

• The debugger directly uses your local .pdb (symbol) files to map stack trace frames to your source code lines in real-time. It doesn't rely on server-side symbol resolution like Raygun does for unattached crashes.
• Attaching a debugger automatically overrides many runtime optimizations, even if your Release config has <Optimize>false</Optimize> set. This keeps the stack trace structure aligned with your original source code.
• Debugger-attached crashes are captured locally by the debugging tooling, not just the Raygun SDK—so it has immediate access to all the context needed to display line numbers.

Without a debugger, the Raygun SDK captures the crash on the device and sends a raw stack trace to Raygun's servers. For those servers to add line numbers, they need access to the exact .pdb files that match your released APK—something that doesn't happen automatically unless you explicitly upload them.

Will adjusting the Release .csproj config fix the missing line numbers? #

Your config changes (<DebugSymbols>True</DebugSymbols>, <DebugType>full</DebugType>, <Optimize>false</Optimize>) are a critical first step, but they alone won't solve the problem. Here's what else you need to do:

• Upload your .pdb files to Raygun: Raygun's servers require these symbol files to decode raw stack traces into human-readable line numbers. You can use Raygun's CLI tool or integrate the upload step into your build pipeline to push the correct .pdb files every time you create a Release build.
• Check linker settings: Xamarin's Release-mode linker can strip unused code and modify method signatures, which breaks the link between stack traces and source lines. Try setting the linker to Sdk Assemblies Only or None (note: this will increase your APK size) to test if line numbers start appearing.
• Verify AOT compilation settings: If you're using Ahead-of-Time (AOT) compilation in Release, it can sometimes interfere with symbol resolution. You might need to disable AOT temporarily to test if it's causing the issue, or ensure your symbol files are compatible with AOT-compiled code.

Once you've got the correct config in place and uploaded your symbols, Raygun should be able to resolve line numbers in Release crashes even without a debugger attached.

内容的提问来源于stack exchange，提问作者theguy