[src] Make sure the (IntPtr/NativeHandle, bool) ctor is always preserved (conditionally) for types that subclass NativeObject. Fixes #13699. (#13708)

Also add test to make sure we never forget again.

Fixes https://github.com/xamarin/xamarin-macios/issues/13699.

src/AddressBook/ABAddressBook.cs

@@ -166,6 +166,7 @@ namespace AddressBook {
 			return new ABAddressBook (handle, true);
 		}
 			
+		[Preserve (Conditional = true)]
 		internal ABAddressBook (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AddressBook/ABGroup.cs

@@ -97,6 +97,7 @@ namespace AddressBook {
 			Handle = ABGroupCreateInSource (source.Handle);
 		}
 
+		[Preserve (Conditional = true)]
 		internal ABGroup (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AddressBook/ABMultiValue.cs

@@ -219,6 +219,7 @@ namespace AddressBook {
 		internal Converter<NativeHandle, T> toManaged;
 		internal Converter<T, NativeHandle> toNative;
 
+		[Preserve (Conditional = true)]
 		internal ABMultiValue (NativeHandle handle, bool owns)
 			: this (handle, 
 					v => (T) (object) Runtime.GetNSObject (v)!,
@@ -315,6 +316,7 @@ namespace AddressBook {
 #endif
 	public class ABMutableMultiValue<T> : ABMultiValue<T>
 	{
+		[Preserve (Conditional = true)]
 		internal ABMutableMultiValue (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AddressBook/ABPerson.cs

@@ -621,6 +621,7 @@ namespace AddressBook {
 		{
 		}
 
+		[Preserve (Conditional = true)]
 		internal ABPerson (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AddressBook/ABSource.cs

@@ -58,6 +58,7 @@ namespace AddressBook {
 #endif
 #endif
 	public class ABSource : ABRecord {
+		[Preserve (Conditional = true)]
 		internal ABSource (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AudioToolbox/AudioConverter.cs

@@ -102,6 +102,7 @@ namespace AudioToolbox
 
 		public event AudioConverterComplexInputData? InputData;
 
+		[Preserve (Conditional = true)]
 		internal AudioConverter (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AudioToolbox/AudioFile.cs

@@ -565,6 +565,7 @@ namespace AudioToolbox {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal AudioFile (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AudioToolbox/MusicPlayer.cs

@@ -83,6 +83,7 @@ namespace AudioToolbox {
 		[DllImport (Constants.AudioToolboxLibrary)]
 		extern static /* OSStatus */ MusicPlayerStatus DisposeMusicPlayer (/* MusicPlayer */ IntPtr inPlayer);
 							      
+		[Preserve (Conditional = true)]
 		MusicPlayer (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AudioToolbox/MusicSequence.cs

@@ -43,6 +43,7 @@ namespace AudioToolbox {
 	public class MusicSequence : DisposableObject
 	{
 #if !COREBUILD
+		[Preserve (Conditional = true)]
 		internal MusicSequence (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/AudioUnit/AudioComponent.cs

@@ -235,6 +235,7 @@ namespace AudioUnit
 
 	public class AudioComponent : DisposableObject {
 #if !COREBUILD
+		[Preserve (Conditional = true)]
 		internal AudioComponent (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{ 

src/AudioUnit/AudioUnit.cs

@@ -313,6 +313,7 @@ namespace AudioUnit
 		Dictionary<uint, RenderDelegate>? renderer;
 		Dictionary<uint, InputDelegate>? inputs;
 
+		[Preserve (Conditional = true)]
 		internal AudioUnit (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -1044,6 +1045,7 @@ namespace AudioUnit
 		{
 		}
 
+		[Preserve (Conditional = true)]
 		internal AURenderEventEnumerator (NativeHandle handle, bool owns)
 		{
 			Handle = handle;

src/CFNetwork/CFHTTPAuthentication.cs

@@ -28,6 +28,7 @@ namespace CoreServices {
 #endif
 
 	public class CFHTTPAuthentication : CFType {
+		[Preserve (Conditional = true)]
 		internal CFHTTPAuthentication (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CFNetwork/CFHTTPMessage.cs

@@ -31,6 +31,7 @@ namespace CoreServices {
 #endif
 
 	public partial class CFHTTPMessage : CFType {
+		[Preserve (Conditional = true)]
 		internal CFHTTPMessage (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CFNetwork/CFHTTPStream.cs

@@ -34,6 +34,7 @@ namespace CoreServices {
 #endif
 	public partial class CFHTTPStream : CFReadStream {
 
+		[Preserve (Conditional = true)]
 		internal CFHTTPStream (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CFNetwork/CFHost.cs

@@ -50,6 +50,7 @@ namespace CoreServices {
 #endif
 #endif
 	class CFHost : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CFHost (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFAllocator.cs

@@ -59,6 +59,7 @@ namespace CoreFoundation {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal CFAllocator (NativeHandle handle, bool owns)
 #else

src/CoreFoundation/CFBundle.cs

@@ -37,6 +37,7 @@ namespace CoreFoundation {
 			public string Creator { get; private set; }
 		}
 
+		[Preserve (Conditional = true)]
 		internal CFBundle (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFData.cs

@@ -40,6 +40,7 @@ using NativeHandle = System.IntPtr;
 namespace CoreFoundation {
 
 	class CFData : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CFData (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFDictionary.cs

@@ -45,6 +45,7 @@ namespace CoreFoundation {
 		public static IntPtr KeyCallbacks;
 		public static IntPtr ValueCallbacks;
 
+		[Preserve (Conditional = true)]
 		internal CFDictionary (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFMachPort.cs

@@ -50,6 +50,7 @@ namespace CoreFoundation
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal CFMachPort (NativeHandle handle, bool owns)
 #else

src/CoreFoundation/CFNotificationCenter.cs

@@ -58,6 +58,7 @@ namespace CoreFoundation {
 	
 	public class CFNotificationCenter : NativeObject {
 		// If this becomes public for some reason, and more than three instances are created, you should revisit the lookup code
+		[Preserve (Conditional = true)]
 		internal CFNotificationCenter (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFPropertyList.cs

@@ -38,6 +38,7 @@ namespace CoreFoundation
 
 		static nint CFNumberTypeID = CFNumberGetTypeID ();
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal CFPropertyList (NativeHandle handle, bool owns)
 #else

src/CoreFoundation/CFReadStream.cs

@@ -56,6 +56,7 @@ namespace CoreFoundation {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CFReadStream (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFRunLoop.cs

@@ -79,6 +79,7 @@ namespace CoreFoundation {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal CFRunLoopSource (NativeHandle handle, bool owns)
 #else

src/CoreFoundation/CFSocket.cs

@@ -33,7 +33,9 @@ using System;
 using System.Net;
 using System.Net.Sockets;
 using System.Runtime.InteropServices;
+
 using CoreFoundation;
+using Foundation;
 using ObjCRuntime;
 
 #if !NET
@@ -335,6 +337,7 @@ namespace CoreFoundation {
 			}
 		}
 
+		[Preserve (Conditional = true)]
 		CFSocket (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFStream.cs

@@ -727,6 +727,7 @@ namespace CoreFoundation {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		protected CFStream (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFType.cs

@@ -8,6 +8,7 @@ using System;
 using System.Runtime.InteropServices;
 
 using CoreFoundation;
+using Foundation;
 using ObjCRuntime;
 
 #if !NET
@@ -28,6 +29,7 @@ namespace CoreFoundation {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CFType (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFUrl.cs

@@ -60,6 +60,7 @@ namespace CoreFoundation {
 			/* CFURLPathStyle */ nint pathStyle, 
 			/* Boolean */ [MarshalAs (UnmanagedType.I1)] bool isDirectory);
 		
+		[Preserve (Conditional = true)]
 		internal CFUrl (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/CFWriteStream.cs

@@ -48,6 +48,7 @@ using NativeHandle = System.IntPtr;
 namespace CoreFoundation {
 
 	public class CFWriteStream : CFStream {
+		[Preserve (Conditional = true)]
 		internal CFWriteStream (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/Dispatch.cs

@@ -760,6 +760,7 @@ namespace CoreFoundation {
 	public class DispatchGroup : DispatchObject
 	{
 #if !COREBUILD
+		[Preserve (Conditional = true)]
 		private DispatchGroup (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/DispatchBlock.cs

@@ -26,6 +26,7 @@ namespace CoreFoundation {
 	[Mac (10, 10)]
 #endif
 	public sealed class DispatchBlock : NativeObject {
+		[Preserve (Conditional = true)]
 		internal DispatchBlock (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreFoundation/DispatchData.cs

@@ -39,6 +39,7 @@ namespace CoreFoundation {
 
 	public partial class DispatchData : DispatchObject {
 #if !COREBUILD
+		[Preserve (Conditional = true)]
 #if NET
 		internal DispatchData (NativeHandle handle, bool owns) : base (handle, owns)
 #else

src/CoreFoundation/OSLog.cs

@@ -21,6 +21,8 @@
 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 using System;
+
+using Foundation;
 using ObjCRuntime;
 using System.Runtime.InteropServices;
 using System.Collections.Generic;
@@ -74,6 +76,7 @@ namespace CoreFoundation {
 		[DllImport ("__Internal")]
 		extern static void xamarin_os_log (IntPtr logHandle, OSLogLevel level, string message);
 
+		[Preserve (Conditional = true)]
 		internal OSLog (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreGraphics/CGEvent.cs

@@ -87,6 +87,7 @@ namespace CoreGraphics {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CGEvent (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreGraphics/CGEventSource.cs

@@ -38,6 +38,7 @@ namespace CoreGraphics {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal CGEventSource (NativeHandle handle, bool owns)
 #else

src/CoreGraphics/CGPDFPage-2.cs

@@ -30,6 +30,8 @@
 
 using System;
 using System.Runtime.InteropServices;
+
+using Foundation;
 using ObjCRuntime;
 
 #if !NET
@@ -57,6 +59,7 @@ namespace CoreGraphics {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CGPDFPage (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreMedia/CMFormatDescription.cs

@@ -293,6 +293,7 @@ namespace CoreMedia {
 	[Watch (6,0)]
 #endif
 	public class CMAudioFormatDescription : CMFormatDescription {
+		[Preserve (Conditional = true)]
 		internal CMAudioFormatDescription (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -305,6 +306,7 @@ namespace CoreMedia {
 	[Watch (6,0)]
 #endif
 	public partial class CMVideoFormatDescription : CMFormatDescription {
+		[Preserve (Conditional = true)]
 		internal CMVideoFormatDescription (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreMedia/CMSync.cs

@@ -34,6 +34,7 @@ namespace CoreMedia {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CMClock (NativeHandle handle, bool owns) 
 			: base (handle, owns)
 		{
@@ -122,6 +123,7 @@ namespace CoreMedia {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		private CMTimebase (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -741,6 +743,7 @@ namespace CoreMedia {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 		internal CMClockOrTimebase (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreText/CTFont.cs

@@ -1485,6 +1485,7 @@ namespace CoreText {
 	}
 
 	public partial class CTFont : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTFont (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTFontCollection.cs

@@ -99,6 +99,7 @@ namespace CoreText {
 	}
 
 	public class CTFontCollection : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTFontCollection (NativeHandle handle, bool owns)
 			: base (handle, owns, verify: true)
 		{

src/CoreText/CTFontDescriptor.cs

@@ -355,6 +355,7 @@ namespace CoreText {
 	}
 
 	public class CTFontDescriptor : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTFontDescriptor (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTFrame.cs

@@ -112,6 +112,7 @@ namespace CoreText {
 	}
 
 	public class CTFrame : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTFrame (NativeHandle handle, bool owns)
 			: base (handle, owns, verify: true)
 		{

src/CoreText/CTFramesetter.cs

@@ -43,6 +43,7 @@ using NativeHandle = System.IntPtr;
 namespace CoreText {
 
 	public class CTFramesetter : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTFramesetter (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTGlyphInfo.cs

@@ -56,6 +56,7 @@ namespace CoreText {
 #endregion
 
 	public class CTGlyphInfo : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTGlyphInfo (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTLine.cs

@@ -64,6 +64,7 @@ namespace CoreText {
     }
 	
 	public class CTLine : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTLine (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTParagraphStyle.cs

@@ -320,6 +320,7 @@ namespace CoreText {
 	}
 
 	public class CTParagraphStyle : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTParagraphStyle (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTRun.cs

@@ -53,6 +53,7 @@ namespace CoreText {
 	}
 
 	public class CTRun : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTRun (NativeHandle handle, bool owns)
 			: base (handle, owns, true)
 		{

src/CoreText/CTRunDelegate.cs

@@ -179,6 +179,7 @@ namespace CoreText {
 	}
 
 	public class CTRunDelegate : NativeObject, IDisposable {
+		[Preserve (Conditional = true)]
 		internal CTRunDelegate (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreText/CTTextTab.cs

@@ -84,6 +84,7 @@ namespace CoreText {
 #endregion
 
 	public class CTTextTab : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTTextTab (NativeHandle handle, bool owns)
 			: base (handle, owns, verify: true)
 		{

src/CoreText/CTTypesetter.cs

@@ -110,6 +110,7 @@ namespace CoreText {
 #endregion
 
 	public class CTTypesetter : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CTTypesetter (NativeHandle handle, bool owns)
 			: base (handle, owns, verify: true)
 		{

src/CoreVideo/CVMetalTexture.cs

@@ -31,6 +31,7 @@ namespace CoreVideo {
 	[iOS (8,0), Mac (12,0), MacCatalyst (15,0)]
 #endif
 	public class CVMetalTexture : NativeObject {
+		[Preserve (Conditional = true)]
 		internal CVMetalTexture (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/CoreVideo/CVMetalTextureCache.cs

@@ -42,6 +42,7 @@ namespace CoreVideo {
 			/* CFDictionaryRef __nullable */ IntPtr textureAttributes, 
 			/* CVMetalTextureCacheRef __nullable * __nonnull */ out IntPtr cacheOut);
 
+		[Preserve (Conditional = true)]
 		internal CVMetalTextureCache (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/Darwin/SystemLog.cs

@@ -30,6 +30,7 @@
 #if MONOMAC
 
 using System;
+using Foundation;
 using ObjCRuntime;
 using System.Runtime.InteropServices;
 using System.Collections.Generic;
@@ -72,6 +73,7 @@ namespace Darwin {
 		{
 		}
 
+		[Preserve (Conditional = true)]
 		SystemLog (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -199,6 +201,7 @@ namespace Darwin {
 			True = 7
 		}
 
+		[Preserve (Conditional = true)]
 		internal Message (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/Network/NWAdvertiseDescriptor.cs

@@ -32,6 +32,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWAdvertiseDescriptor : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWAdvertiseDescriptor (NativeHandle handle, bool owns) : base (handle, owns)
 #else

src/Network/NWBrowseResult.cs

@@ -35,6 +35,7 @@ namespace Network {
 #endif
 	public class NWBrowseResult : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWBrowseResult (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWBrowser.cs

@@ -45,6 +45,7 @@ namespace Network {
 		bool queueSet = false;
 		object startLock = new Object ();
 
+		[Preserve (Conditional = true)]
 		internal NWBrowser (NativeHandle handle, bool owns) : base (handle, owns)
 		{
 			SetChangesHandler (InternalChangesHandler);

src/Network/NWBrowserDescriptor.cs

@@ -33,6 +33,7 @@ namespace Network {
 #endif
 	public class NWBrowserDescriptor: NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWBrowserDescriptor (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWConnection.cs

@@ -54,6 +54,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWConnection : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWConnection (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWConnectionGroup.cs

@@ -45,6 +45,7 @@ namespace Network {
 	[SupportedOSPlatform ("maccatalyst14.0")]
 #endif
 	public class NWConnectionGroup : NativeObject {
+		[Preserve (Conditional = true)]
 		protected internal NWConnectionGroup (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWContentContext.cs

@@ -35,6 +35,7 @@ namespace Network {
 #endif
 	public class NWContentContext : NativeObject {
 		bool global;
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWContentContext (NativeHandle handle, bool owns) : base (handle, owns)
 #else

src/Network/NWDataTransferReport.cs

@@ -36,6 +36,7 @@ namespace Network {
 #endif
 	public class NWDataTransferReport : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWDataTransferReport (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWEndpoint.cs

@@ -34,6 +34,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWEndpoint : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWEndpoint (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWError.cs

@@ -30,6 +30,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWError : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWError (NativeHandle handle, bool owns) : base (handle, owns)
 #else

src/Network/NWEstablishmentReport.cs

@@ -39,6 +39,7 @@ namespace Network {
 #endif
 	public class NWEstablishmentReport : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWEstablishmentReport (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWEthernetChannel.cs

@@ -41,6 +41,7 @@ namespace Network {
 #endif
 	public class NWEthernetChannel : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWEthernetChannel (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWFramer.cs

@@ -42,6 +42,7 @@ namespace Network {
 	[SupportedOSPlatform ("macos10.15")]
 #endif
 	public class NWFramer : NativeObject {
+		[Preserve (Conditional = true)]
 		internal NWFramer (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWFramerMessage.cs

@@ -39,6 +39,7 @@ namespace Network {
 	[SupportedOSPlatform ("macos10.15")]
 #endif
 	public class NWFramerMessage : NWProtocolMetadata {
+		[Preserve (Conditional = true)]
 		internal NWFramerMessage (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWIPMetadata.cs

@@ -29,6 +29,7 @@ namespace Network {
 #endif
 	public class NWIPMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 		internal NWIPMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWIPMetadata () : this (nw_ip_create_metadata (), owns: true) {}

src/Network/NWInterface.cs

@@ -33,6 +33,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWInterface : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWInterface (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWListener.cs

@@ -34,6 +34,7 @@ namespace Network {
 	public class NWListener : NativeObject {
 		bool connectionHandlerWasSet = false;
 		object connectionHandlerLock = new object ();
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWListener (NativeHandle handle, bool owns) : base (handle, owns)
 #else

src/Network/NWMulticastGroup.cs

@@ -25,6 +25,7 @@ namespace Network {
 	[SupportedOSPlatform ("maccatalyst14.0")]
 #endif
 	public class NWMulticastGroup : NativeObject {
+		[Preserve (Conditional = true)]
 		internal NWMulticastGroup (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWMultiplexGroup.cs

@@ -25,6 +25,7 @@ namespace Network {
 		[DllImport (Constants.NetworkLibrary)]
 		static extern OS_nw_group_descriptor nw_group_descriptor_create_multiplex (OS_nw_endpoint remoteEndpoint);
 		
+		[Preserve (Conditional = true)]
 		internal NWMultiplexGroup (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWMultiplexGroup (NWEndpoint endpoint) 

src/Network/NWParameters.cs

@@ -12,6 +12,8 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
+
+using Foundation;
 using ObjCRuntime;
 using CoreFoundation;
 
@@ -34,6 +36,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWParameters : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWParameters (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWPath.cs

@@ -31,6 +31,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWPath : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWPath (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWPathMonitor.cs

@@ -33,6 +33,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWPathMonitor : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWPathMonitor (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWPrivacyContext.cs

@@ -24,6 +24,7 @@ namespace Network {
 		public static NWPrivacyContext Default =>
 			new NWPrivacyContext (NWPrivacyContextConstants._DefaultContext, false); 
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWPrivacyContext (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWProtocolDefinition.cs

@@ -33,6 +33,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWProtocolDefinition : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWProtocolDefinition (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWProtocolIPOptions.cs

@@ -35,6 +35,7 @@ namespace Network {
 	[SupportedOSPlatform ("macos10.15")]
 #endif
 	public class NWProtocolIPOptions : NWProtocolOptions {
+		[Preserve (Conditional = true)]
 		internal NWProtocolIPOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public void SetVersion (NWIPVersion version)

src/Network/NWProtocolMetadata.cs

@@ -58,6 +58,7 @@ namespace Network {
 		}
 #endif
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWProtocolMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWProtocolOptions.cs

@@ -34,6 +34,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWProtocolOptions : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWProtocolOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWProtocolQuicOptions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Runtime.InteropServices;
 
+using Foundation;
 using ObjCRuntime;
 using Security;
 using System.Runtime.Versioning;
@@ -24,6 +25,7 @@ namespace Network {
 #endif
 	public class NWProtocolQuicOptions : NWProtocolOptions {
 
+		[Preserve (Conditional = true)]
 		internal NWProtocolQuicOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 		
 		public NWProtocolQuicOptions () : this (nw_quic_create_options (), owns: true) {}

src/Network/NWProtocolStack.cs

@@ -36,6 +36,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWProtocolStack : NativeObject {
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWProtocolStack (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWProtocolTcpOptions.cs

@@ -35,6 +35,7 @@ namespace Network {
 #endif
 	public class NWProtocolTcpOptions : NWProtocolOptions {
 		
+		[Preserve (Conditional = true)]
 		internal NWProtocolTcpOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWProtocolTcpOptions () : this (nw_tcp_create_options (), owns: true) {}

src/Network/NWProtocolTlsOptions.cs

@@ -33,6 +33,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWProtocolTlsOptions : NWProtocolOptions {
+		[Preserve (Conditional = true)]
 		internal NWProtocolTlsOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWProtocolTlsOptions () : this (nw_tls_create_options (), owns: true) {}

src/Network/NWProtocolUdpOptions.cs

@@ -29,6 +29,7 @@ namespace Network {
 	[SupportedOSPlatform ("tvos12.0")]
 #endif
 	public class NWProtocolUdpOptions : NWProtocolOptions {
+		[Preserve (Conditional = true)]
 		internal NWProtocolUdpOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWProtocolUdpOptions () : this (nw_udp_create_options (), owns: true) {}

src/Network/NWQuicMetadata.cs

@@ -2,6 +2,7 @@ using System;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
 
+using Foundation;
 using ObjCRuntime;
 using Security;
 
@@ -23,6 +24,7 @@ namespace Network {
 #endif
 	public class NWQuicMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWQuicMetadata (NativeHandle handle, bool owns) : base (handle, owns) { }
 #else

src/Network/NWResolutionReport.cs

@@ -25,6 +25,7 @@ namespace Network {
 #endif
 	public class NWResolutionReport : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWResolutionReport (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWResolverConfig.cs

@@ -2,6 +2,8 @@
 
 using System;
 using System.Runtime.InteropServices;
+
+using Foundation;
 using ObjCRuntime;
 using CoreFoundation;
 using System.Runtime.Versioning;
@@ -22,6 +24,7 @@ namespace Network {
 #endif
 	public class NWResolverConfig : NativeObject {
 
+		[Preserve (Conditional = true)]
 #if NET
 		internal NWResolverConfig (NativeHandle handle, bool owns) : base (handle, owns) {}
 #else

src/Network/NWTcpMetadata.cs

@@ -29,6 +29,7 @@ namespace Network {
 #endif
 	public class NWTcpMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 		internal NWTcpMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public uint AvailableReceiveBuffer => nw_tcp_get_available_receive_buffer (GetCheckedHandle ());

src/Network/NWTlsMetadata.cs

@@ -30,6 +30,7 @@ namespace Network {
 #endif
 	public class NWTlsMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 		internal NWTlsMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public SecProtocolMetadata SecProtocolMetadata

src/Network/NWTxtRecord.cs

@@ -37,6 +37,7 @@ namespace Network {
 	[SupportedOSPlatform ("macos10.15")]
 #endif
 	public class NWTxtRecord : NativeObject {
+		[Preserve (Conditional = true)]
 		internal NWTxtRecord (NativeHandle handle, bool owns) : base (handle, owns) { }
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWUdpMetadata.cs

@@ -30,6 +30,7 @@ namespace Network {
 #endif
 	public class NWUdpMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 		internal NWUdpMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		public NWUdpMetadata () : this (nw_udp_create_metadata (), owns: true) {}

src/Network/NWWebSocketMetadata.cs

@@ -36,6 +36,7 @@ namespace Network {
 #endif
 	public class NWWebSocketMetadata : NWProtocolMetadata {
 
+		[Preserve (Conditional = true)]
 		internal NWWebSocketMetadata (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWWebSocketOptions.cs

@@ -38,6 +38,7 @@ namespace Network {
 		bool skipHandShake = false;
 		nuint maximumMessageSize;
 
+		[Preserve (Conditional = true)]
 		internal NWWebSocketOptions (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWWebSocketRequest.cs

@@ -33,6 +33,7 @@ namespace Network {
 	[SupportedOSPlatform ("macos10.15")]
 #endif
 	public class NWWebSocketRequest : NativeObject {
+		[Preserve (Conditional = true)]
 		internal NWWebSocketRequest (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary)]

src/Network/NWWebSocketResponse.cs

@@ -34,6 +34,7 @@ namespace Network {
 #endif
 	public class NWWebSocketResponse : NativeObject {
 
+		[Preserve (Conditional = true)]
 		internal NWWebSocketResponse (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		[DllImport (Constants.NetworkLibrary, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]

src/PrintCore/PrintCore.cs

@@ -26,6 +26,7 @@ using NativeHandle = System.IntPtr;
 
 namespace PrintCore {
 	public class PMPrintCoreBase : NativeObject {
+		[Preserve (Conditional = true)]
 		internal PMPrintCoreBase (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -56,6 +57,7 @@ namespace PrintCore {
 		[DllImport (Constants.PrintCoreLibrary)]
 		extern static PMStatusCode PMCreateSession (out IntPtr session);
 
+		[Preserve (Conditional = true)]
 		internal PMPrintSession (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		static IntPtr Create ()
@@ -160,6 +162,7 @@ namespace PrintCore {
 		[DllImport (Constants.PrintCoreLibrary)]
 		extern static PMStatusCode PMCreatePrintSettings (out IntPtr session);
 		
+		[Preserve (Conditional = true)]
 		internal PMPrintSettings (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -319,6 +322,7 @@ namespace PrintCore {
 		[DllImport (Constants.PrintCoreLibrary)]
 		extern static PMStatusCode PMCreatePageFormatWithPMPaper (out IntPtr handle, IntPtr paper);
 
+		[Preserve (Conditional = true)]
 		internal PMPageFormat (NativeHandle handle, bool owns): base (handle, owns) {}
 
 		static IntPtr Create (PMPaper? paper = null)
@@ -398,6 +402,7 @@ namespace PrintCore {
 	}
 
 	public class PMPaper : PMPrintCoreBase {
+		[Preserve (Conditional = true)]
 		internal PMPaper (NativeHandle handle, bool owns) : base (handle, owns) {}
 		[DllImport (Constants.PrintCoreLibrary)]
 		extern static PMStatusCode PMPaperGetID (IntPtr handle, out IntPtr str);
@@ -465,6 +470,7 @@ namespace PrintCore {
 		[DllImport (Constants.PrintCoreLibrary)]
 		extern static IntPtr PMPrinterCreateFromPrinterID (IntPtr id);
 
+		[Preserve (Conditional = true)]
 		internal PMPrinter (NativeHandle handle, bool owns) : base (handle, owns) {}
 
 		static IntPtr Create ()

src/SearchKit/SearchKit.cs

@@ -47,6 +47,7 @@ namespace SearchKit
 
 	public class SKSearch : NativeObject
 	{
+		[Preserve (Conditional = true)]
 		internal SKSearch (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -134,6 +135,7 @@ namespace SearchKit
 		{
 		}
 
+		[Preserve (Conditional = true)]
 		internal SKDocument (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -197,6 +199,7 @@ namespace SearchKit
 		[DllImport (Constants.SearchKitLibrary)]
 		extern static void SKIndexClose (IntPtr handle);
 
+		[Preserve (Conditional = true)]
 		SKIndex (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{
@@ -490,6 +493,7 @@ namespace SearchKit
 
 	public class SKSummary : NativeObject
 	{
+		[Preserve (Conditional = true)]
 		internal SKSummary (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/Security/Authorization.cs

@@ -154,6 +154,7 @@ namespace Security {
 		[DllImport (Constants.SecurityLibrary)]
 		extern static int /* OSStatus = int */ AuthorizationFree (IntPtr handle, AuthorizationFlags flags);
 		
+		[Preserve (Conditional = true)]
 		internal Authorization (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{

src/Security/SecAccessControl.cs

@@ -106,6 +106,7 @@ namespace Security {
 #endif
 	public partial class SecAccessControl : NativeObject {
 #if !COREBUILD
+		[Preserve (Conditional = true)]
 		internal SecAccessControl (NativeHandle handle, bool owns)
 			: base (handle, owns)
 		{