Xamarin.Mac 模糊 SIGSEGV

Question

我遇到了 xamarin.mac 的模糊段错误，这是（无用的）堆栈跟踪：

  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>

在处理大量处理的NSOutlineView 上处理SelectionDidChange 后发生崩溃。

很难确定究竟是什么导致了这次崩溃。

有什么想法吗？

Answer 1

错误是由C# 对象被错误地垃圾收集引起的。

它们被垃圾回收了，因为这些对象被返回到objective-c 代码（本机代码），并且由于C# 中没有保留任何引用，因此垃圾回收器正在删除它们。

这就是发生的事情：

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

你应该做什么：

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

就是这样！