Xamarin.Mac使SIGSEGV模糊

Question

我在xamarin.mac遇到了晦澀的段xamarin.mac ，這是（無用的）stacktrace：

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) MonoMac.AppKit.NSApplication.NSApplicationMain     (int,string[]) <0xffffffff>
  at MonoMac.AppKit.NSApplication.Main (string[]) <0x00097>
  at gitbookpro.mac.MainClass.Main (string[]) <0x00017>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff>

在處理NSOutlineView上的SelectionDidChange之后，會發生崩潰，該處理會進行大量處理。

很難確定到底是什么導致了崩潰。

有任何想法嗎 ？

Answer 1

該錯誤是由於C#對象被錯誤地垃圾回收引起的 。

之所以將它們作為垃圾回收是因為這些對象將返回到objective-c代碼（本機代碼），並且由於C#沒有保留引用，因此垃圾回收器正在刪除它們。

這就是正在發生的事情：

1. create C# obj 2. return obj to native code 3. ... wait a little bit ... 4. turn native object back into to C# obj (in event handlers etc ...) 5. Access C# obj <= This would fail occasionally since it was being garbage collected during step #3

您應該做什么：

1. create C# obj 1bis. Keep an extra reference to the object somewhere (in an Dictionary for example) 2. return obj to native code 3. ... wait a little bit ... 4. turn native object back into to C# obj (in event handlers etc ...) 4bis. Remove extra reference 5. Access C# obj <= This would fail occasionally since it was being garbage collected during step #3

就是這樣！