我正在使用Visual Studio 2013中最新版本的Xamarin Android . 当我调试我的代码时，catch块没有捕获任何抛出的异常 . 它正在工作，然后它似乎停止了 . 我不知道发生了什么 . 以下代码是问题的实际实例的简化表示 .

// private Context _context; set by class constructor and is valid
// private Version _storedVersions
try
{
    // This line works as expected.
    ISharedPreferences sharedPrefs = _context.GetSharedPreferences("shared.prefs.file", FileCreationMode.Private);

    // This line also works as expected. GetString() returns the default 'null'
    // because the sharePrefs file was just created and is empty.
    string versions = sharedPrefs.GetString("Versions", null)

    // This line throws a System.ArgumentNullException because 'versions' is null.
    // This is also to be expected.
    _storedVersions = JsonConvert.DeserializeObject<Versions>(versions);

    // The problem is that 'catch' does not catch the exception.
    // The debugger breaks on the JsonConvert line above.
    // RespondAccordingly() does not get called.
}
catch
{
    // Never called
    RespondAccordingly();
}

有没有人见过这个？更好的是，有谁知道如何解决它？我死在水里，直到我能解决这个问题 .

UPDATE: The non-debug version of the app loads and runs fine on the device. The debug version also runs just fine on the device as long as the debugger is not attached.

c# android exception xamarin catch-block