即使在固定后委托也能获得 GC？

Question

相关代码在这里： https://github.com/AkazaRenn/FruitLanguageSwitcher/blob/main/Core/Hotkey.cs#L17

回调代码相关class：

    internal class Hotkey {
        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
        public delegate void AHKDelegate();
        private readonly AutoHotkeyEngine ahk = AutoHotkeyEngine.Instance;
        private readonly List<GCHandle> handles = new();

        public Hotkey(AHKDelegate _onCapsLock) {
            SetVarOnSettings();

            handles.Add(GCHandle.Alloc(_onCapsLock));
            ahk.SetVar("onCapsLockPtr", GetActionDelegateStr(_onCapsLock));
            ahk.ExecRaw(System.Text.Encoding.Default.GetString(Properties.Resources.CapsLock));
        }

        ~Hotkey() {
            foreach(var handle in handles) {
                handle.Free();
            }

        }

非托管代码：

    $CapsLock::
        If (GetKeyState("CapsLock", "T")) {
            SetCapsLockState Off
        } else {
            KeyWait, CapsLock, T0.5
            If (ErrorLevel) {
                SetCapsLockState On
                KeyWait, CapsLock
            } else {
                DllCall(onCapsLockPtr)
            }
        }
    Return

传递给Hotkey()的实际委托可以在这里找到： https://github.com/AkazaRenn/FruitLanguageSwitcher/blob/main/App.xaml.cs#L82

委托的固定指针地址被发送到AHKDLL （非托管）以进行回调。 一开始它会很好地工作，但是程序会在随机的一段时间后（相当多的几个小时）崩溃，在事件查看器中有这样的日志：

Application: FruitLanguageSwitcher.exe
CoreCLR Version: 7.0.222.60605
.NET Version: 7.0.2
Description: The application requested process termination through System.Environment.FailFast.
Message: A callback was made on a garbage collected delegate of type 'FruitLanguageSwitcher!FruitLanguageSwitcher.Core.Hotkey+AHKDelegate::Invoke'.
Stack:

Faulting application name: FruitLanguageSwitcher.exe, version: 1.0.0.0, time stamp: 0x638f99ee
Faulting module name: coreclr.dll, version: 7.0.222.60605, time stamp: 0x638f9099
Exception code: 0x80131623
Fault offset: 0x00000000002662d9
Faulting process id: 0x0xFDC
Faulting application start time: 0x0x1D92F3E416B9F1A
Faulting application path: C:\Program Files\WindowsApps\AkazaRenn.82975CBC0BB1_1.2.2.0_x64__fhf2jh1qk9hx4\FruitLanguageSwitcher.exe
Faulting module path: C:\Program Files\WindowsApps\AkazaRenn.82975CBC0BB1_1.2.2.0_x64__fhf2jh1qk9hx4\coreclr.dll
Report Id: 69384484-bd77-4f32-b5f0-6c01c00fb673
Faulting package full name: AkazaRenn.82975CBC0BB1_1.2.2.0_x64__fhf2jh1qk9hx4
Faulting package-relative application ID: App

我试过按照 SOF 中其他一些问题的建议进行混搭和 object 固定，但没有一个解决了我的问题。 我现在对如何让我的代表真正固定感到很困惑。 提前致谢！

Answer 1

简单地总结一下，我什至不需要GCHandle ，只需将委托保存为 static 变量即可完成这项工作，例如：

        private static readonly List<AHKDelegate> handlers = new();

        public Hotkey(AHKDelegate _onCapsLock, AHKDelegate _onLanguageChange, AHKDelegate _onRaltUp) {

            handlers.Add(_onCapsLock);
            ahk.SetVar("onCapsLockPtr", GetActionDelegateStr(_onCapsLock));

            handlers.Add(_onLanguageChange);
            ahk.SetVar("onLanguageChangePtr", GetActionDelegateStr(_onLanguageChange));

            handlers.Add(_onRaltUp);
            ahk.SetVar("onRaltUpPtr", GetActionDelegateStr(_onRaltUp));
        }

感谢@HansPassant 指出！