目前我对Xamarin.Mac有很多困难。
基本上我想要做的就是POST和从网络服务器获取一些JSON，然后调用一个事件，通过代理冒泡到（最终会是什么）UI更改事件（此刻它只是一个debug.writeline call。。
我有两个PCL库，一个是'核心'，另一个是核心引用的库，一个WPF应用程序和一个OS X应用程序 - WPF应用程序正常工作。我也在使用MVVMCross。
首先，我尝试使用一个使用HTTPWebRequest的预先存在的类，它工作正常，用于第一次按键点击（触发此调用）。在第二个按钮上单击OS X应用程序崩溃。我尝试切换到HttpClient，没有骰子。
读完这个帖子后：https://bugzilla.xamarin.com/show_bug.cgi?id=19906我试过，使用接口将OS X应用程序的HTTP类切换到NSUrlConnection的本机实现。
现在这是我发现自己的情况： 如果我有一个带有匿名函数的NSUrlConnection ASync请求，它会在点击后永久点击 如果我把它取出并调用一个FireEvent（）函数，该函数只会引发事件（这可能会在链中产生更多事件），那么它将永远有效，点击后单击 如果我同时拥有带有匿名函数的ASync和FireEvent，则在第三次单击触发此按钮的按钮时，它会引发本机崩溃。
如果我拿出所有异步的东西，它会正常工作，但那并不理想。
有什么想法吗？我的智慧结束了。
public void ExecuteAsync()
{
var request = new NSUrlRequest(new NSUrl("http://www.example.com"));
asyncRunning = true;
NSUrlConnection.SendAsynchronousRequest(request, NSOperationQueue.MainQueue, delegate(NSUrlResponse response, NSData data, NSError error) {
var responseStr = data.ToString();
var blah = new HttpResponseCompleteEventArgs("{TESTJSONThatIveRemovedForReadability}");
System.Diagnostics.Debug.WriteLine("Inside IsMainThread: " + NSThread.IsMain.ToString());
response.InvokeOnMainThread ( delegate {
FireEvent(blah);
System.Diagnostics.Debug.WriteLine("Inside IsMainThread invoke: " + NSThread.IsMain.ToString());
});
});
System.Diagnostics.Debug.WriteLine("Outside IsMainThread: " + NSThread.IsMain.ToString());
}
崩溃
Stacktrace:
at <unknown> <0xffffffff>
at (wrapper managed-to-native) MonoMac.AppKit.NSApplication.NSApplicationMain (int,string[]) <IL 0x0009d, 0xffffffff>
at MonoMac.AppKit.NSApplication.Main (string[]) [0x00041] in /Users/builder/data/lanes/xamcore-lion-1.8-branch/b8b75fd4/source/xamcore/src/AppKit/NSApplication.cs:105
at FreshlySqueezed.Mac.MainClass.Main (string[]) [0x00007] in /Users/blah/Development/Development/FreshlySqueezed/FreshlySqueezed.Mac/Main.cs:14
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
Native stacktrace:
Debug info from gdb:
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quProcess 2693 stopped
* thread #1: tid = 0x1e2f7, 0x91b0cfed libsystem_kernel.dylib`__wait4 + 5, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
thread #2: tid = 0x1e30e, 0x91b0d992 libsystem_kernel.dylib`kevent64 + 10, queue = 'com.apple.libdispatch-manager'
thread #3: tid = 0x1e30f, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
thread #4: tid = 0x1e310, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
thread #5: tid = 0x1e311, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
thread #6: tid = 0x1e314, 0x91b07fb6 libsystem_kernel.dylib`semaphore_wait_trap + 10
thread #7: tid = 0x1e315, 0x91b0ca26 libsystem_kernel.dylib`__recvfrom + 10
thread #8: tid = 0x1e32c, 0x91b07f7a libsystem_kernel.dylib`mach_msg_trap + 10
thread #9: tid = 0x1e32e, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
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qu* thread #1: tid = 0x1e2f7, 0x91b0cfed libsystem_kernel.dylib`__wait4 + 5, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
* frame #0: 0x91b0cfed libsystem_kernel.dylib`__wait4 + 5
frame #1: 0x92c46ec5 libsystem_c.dylib`waitpid$UNIX2003 + 48
frame #2: 0x018ab5f9 libmono-2.0.dylib`mono_handle_native_sigsegv(signal=11, ctx=0x006e1fe0) + 489 at mini-exceptions.c:2305
frame #3: 0x018fd9d5 libmono-2.0.dylib`mono_arch_handle_altstack_exception(sigctx=0x006e1fe0, fault_addr=0x608962a8, stack_ovf=0) + 149 at exceptions-x86.c:1170
frame #4: 0x01804351 libmono-2.0.dylib`mono_sigsegv_signal_handler(_dummy=11, info=0x006e1fa0, context=0x006e1fe0) + 369 at mini.c:6842
frame #5: 0x94fd1deb libsystem_platform.dylib`_sigtramp + 43
thread #2: tid = 0x1e30e, 0x91b0d992 libsystem_kernel.dylib`kevent64 + 10, queue = 'com.apple.libdispatch-manager'
frame #0: 0x91b0d992 libsystem_kernel.dylib`kevent64 + 10
frame #1: 0x9a415899 libdispatch.dylib`_dispatch_mgr_invoke + 238
frame #2: 0x9a415532 libdispatch.dylib`_dispatch_mgr_thread + 52
thread #3: tid = 0x1e30f, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #0: 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x91cfbdcf libsystem_pthread.dylib`_pthread_wqthread + 372
thread #4: tid = 0x1e310, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #0: 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x91cfbdcf libsystem_pthread.dylib`_pthread_wqthread + 372
thread #5: tid = 0x1e311, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #0: 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x91cfbdcf libsystem_pthread.dylib`_pthread_wqthread + 372
thread #6: tid = 0x1e314, 0x91b07fb6 libsystem_kernel.dylib`semaphore_wait_trap + 10
frame #0: 0x91b07fb6 libsystem_kernel.dylib`semaphore_wait_trap + 10
frame #1: 0x01a1891e libmono-2.0.dylib`mono_sem_wait(sem=<unavailable>, alertable=<unavailable>, sem=0x01b1ac20, alertable=1) + 30 at mono-semaphore.c:121
frame #2: 0x019c43ea libmono-2.0.dylib`finalizer_thread(unused=0x00000000) + 74 at gc.c:1073
frame #3: 0x0199c654 libmono-2.0.dylib`start_wrapper [inlined] start_wrapper_internal(data=0x00193bd0) + 442 at threads.c:647
frame #4: 0x0199c49a libmono-2.0.dylib`start_wrapper(data=0x00193bd0) + 26 at threads.c:692
frame #5: 0x01a1de1d libmono-2.0.dylib`inner_start_thread(arg=0xbffff2c0) + 253 at mono-threads-posix.c:94
frame #6: 0x01a3eebd libmono-2.0.dylib`GC_start_routine(arg=0x006e2f60) + 93 at pthread_support.c:1502
frame #7: 0x91cfa5fb libsystem_pthread.dylib`_pthread_body + 144
frame #8: 0x91cfa485 libsystem_pthread.dylib`_pthread_start + 130
thread #7: tid = 0x1e315, 0x91b0ca26 libsystem_kernel.dylib`__recvfrom + 10
frame #0: 0x91b0ca26 libsystem_kernel.dylib`__recvfrom + 10
frame #1: 0x92c470c9 libsystem_c.dylib`recv$UNIX2003 + 54
frame #2: 0x018d58c0 libmono-2.0.dylib`socket_transport_recv(buf=0xb039aeed, len=11) + 160 at debugger-agent.c:1085
frame #3: 0x018d1c8d libmono-2.0.dylib`debugger_thread(arg=0x00000000) + 21485 at debugger-agent.c:1475
frame #4: 0x01a1de1d libmono-2.0.dylib`inner_start_thread(arg=0xbffff2c0) + 253 at mono-threads-posix.c:94
frame #5: 0x01a3eebd libmono-2.0.dylib`GC_start_routine(arg=0x006e2f60) + 93 at pthread_support.c:1502
frame #6: 0x91cfa5fb libsystem_pthread.dylib`_pthread_body + 144
frame #7: 0x91cfa485 libsystem_pthread.dylib`_pthread_start + 130
thread #8: tid = 0x1e32c, 0x91b07f7a libsystem_kernel.dylib`mach_msg_trap + 10
frame #0: 0x91b07f7a libsystem_kernel.dylib`mach_msg_trap + 10
frame #1: 0x91b0716c libsystem_kernel.dylib`mach_msg + 68
frame #2: 0x9bea0bf9 CoreFoundation`__CFRunLoopServiceMachPort + 169
frame #3: 0x9bea01d1 CoreFoundation`__CFRunLoopRun + 1393
frame #4: 0x9be9f9ea CoreFoundation`CFRunLoopRunSpecific + 394
frame #5: 0x9be9f84b CoreFoundation`CFRunLoopRunInMode + 123
frame #6: 0x90de9b88 AppKit`_NSEventThread + 283
frame #7: 0x91cfa5fb libsystem_pthread.dylib`_pthread_body + 144
frame #8: 0x91cfa485 libsystem_pthread.dylib`_pthread_start + 130
thread #9: tid = 0x1e32e, 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #0: 0x91b0d046 libsystem_kernel.dylib`__workq_kernreturn + 10
frame #1: 0x91cfbdcf libsystem_pthread.dylib`_pthread_wqthread + 372
Executing commands in '/tmp/mono-gdb-commands.J45EfM'.
(lldb) process attach --pid 2693
Process 2693 stopped
任何人都有任何想法？我很难过。
由于
答案 0 :(得分：0)
因此，经过几个小时的搔痒，我似乎偶然发现了解决方案。
从早期开始，我怀疑这与垃圾收集有关，或者在第三次点击按钮之后，当我的任何代码被点击之前应用程序崩溃，以及读取其他stackoverflow问题时，会失去绑定的事件使用Xamarin / OS X，我的症状听起来类似于过度热衷的垃圾收集器。
所以起初我以为每次收到来自网络服务器的响应都会引发一个事件，并且事件已经冒泡到ViewModel，所以基本上将它冒泡到OSX项目中的ViewController。目的是尝试使用此事件在每次单击后重新绑定按钮绑定 - 但是我尝试使用空的事件处理程序运行它，我发现它修复了最初的问题！
因此，尽管ViewController已经通过this.ViewModel引用了ViewModel，但似乎OS X / XamMac过于急切并且处理了ViewModel，因此将App带到了它的膝盖。有趣的是，我只发现添加和处理事件来解决这个问题，尝试将this.ViewModel分配给另一个类变量没有效果。
所以这是修复它的代码：
在viewmodel中我添加了这个：
public event System.EventHandler GoCommandFinished;
public void CallbackFromWebRequest(SqueezeBase value){
System.Diagnostics.Debug.WriteLine("hmmm");
Hello = "whey?" + x;
if (GoCommandFinished != null) {
GoCommandFinished (null, null);
}
}
在OS X端的视图控制器中，我将其添加到ViewDidLoad：
((FirstViewModel)this.ViewModel).GoCommandFinished += GoCommandFinished;
然后创建一个空函数来处理这个：
private void GoCommandFinished(object sender, EventArgs e){
}
和volia！我有兴趣知道一种更清洁的方式来解决这个问题，因为这对我来说非常讨厌...但是现在，我不在乎，它有效！但是，如果来自Xamarin的任何人都可以解释如何更加优雅地平息垃圾收集，那就太棒了！
由于