[Network] Add Support for DotNet Attributes (#12590)

Co-authored-by: TJ Lambert <tjlambert@microsoft.com>

src/Network/NWAdvertiseDescriptor.cs

@@ -10,6 +10,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -19,8 +20,13 @@ using OS_nw_advertise_descriptor=System.IntPtr;
 using OS_nw_txt_record=System.IntPtr;
 
 namespace Network {
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWAdvertiseDescriptor : NativeObject {
 		public NWAdvertiseDescriptor (IntPtr handle, bool owns) : base (handle, owns)
 		{ }
@@ -65,15 +71,33 @@ namespace Network {
 			get => nw_advertise_descriptor_get_no_auto_rename (GetCheckedHandle ());
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern OS_nw_txt_record nw_advertise_descriptor_copy_txt_record_object (OS_nw_advertise_descriptor advertise_descriptor);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern void nw_advertise_descriptor_set_txt_record_object (OS_nw_advertise_descriptor advertise_descriptor, OS_nw_txt_record txt_record);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public NWTxtRecord TxtRecord {
 			get => new NWTxtRecord (nw_advertise_descriptor_copy_txt_record_object (GetCheckedHandle ()), owns: true); 
 			set => nw_advertise_descriptor_set_txt_record_object (GetCheckedHandle (), value.GetHandle ()); 

src/Network/NWBrowseResult.cs

@@ -11,6 +11,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,7 +22,13 @@ using OS_nw_txt_record=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWBrowseResult : NativeObject {
 
 		internal NWBrowseResult (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWBrowser.cs

@@ -12,6 +12,7 @@ using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -27,7 +28,13 @@ namespace Network {
 
 	public delegate void NWBrowserCompleteChangesDelegate (List<(NWBrowseResult? result, NWBrowseResultChange change)>? changes);
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWBrowser : NativeObject {
 
 		bool started = false;

src/Network/NWBrowserDescriptor.cs

@@ -11,6 +11,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -19,7 +20,13 @@ using OS_nw_browse_descriptor=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWBrowserDescriptor: NativeObject {
 
 		internal NWBrowserDescriptor (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWConnection.cs

@@ -10,6 +10,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -41,8 +42,13 @@ namespace Network {
 	//
 	public delegate void NWConnectionReceiveReadOnlySpanCompletion (ReadOnlySpan<byte> data, NWContentContext? context, bool isComplete, NWError? error);
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWConnection : NativeObject {
 		public NWConnection (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -564,7 +570,13 @@ namespace Network {
 			BlockLiteral.SimpleCall (method, (arg)=> nw_connection_batch (GetCheckedHandle (), arg));
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		unsafe static extern void nw_connection_access_establishment_report (IntPtr connection, IntPtr queue, ref BlockLiteral access_block);
 
@@ -582,7 +594,13 @@ namespace Network {
 			}
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[BindingImpl (BindingImplOptions.Optimizable)]
 		public void GetEstablishmentReport (DispatchQueue queue, Action<NWEstablishmentReport> handler)
 		{

src/Network/NWConnectionGroup.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -15,16 +16,27 @@ using OS_nw_endpoint=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (14,0), Mac (11,0), iOS (14,0), Watch (7,0)]
 	[MacCatalyst (14,0)]
+#endif
 	public delegate void NWConnectionGroupReceiveDelegate (DispatchData content, NWContentContext context, bool isCompleted);
 
+#if !NET
 	[TV (14,0), Mac (11,0), iOS (14,0), Watch (7,0)]
 	[MacCatalyst (14,0)]
+#endif
 	public delegate void NWConnectionGroupStateChangedDelegate (NWConnectionGroupState state, NWError? error);
 
+#if !NET
 	[TV (14,0), Mac (11,0), iOS (14,0), Watch (7,0)]
 	[MacCatalyst (14,0)]
+#else
+	[SupportedOSPlatform ("ios14.0")]
+	[SupportedOSPlatform ("tvos14.0")]
+	[SupportedOSPlatform ("macos11.0")]
+	[SupportedOSPlatform ("maccatalyst14.0")]
+#endif
 	public class NWConnectionGroup : NativeObject {
 		protected NWConnectionGroup (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWContentContext.cs

@@ -11,6 +11,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,8 +22,13 @@ namespace Network {
 	// The content context, there are a few pre-configured content contexts for sending
 	// available as static properties on this class
 	//
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWContentContext : NativeObject {
 		bool global;
 		public NWContentContext (IntPtr handle, bool owns) : base (handle, owns)

src/Network/NWDataTransferReport.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -22,7 +23,13 @@ using OS_nw_interface=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWDataTransferReport : NativeObject {
 
 		internal NWDataTransferReport (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWEndpoint.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,8 +21,14 @@ using OS_nw_endpoint=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWEndpoint : NativeObject {
 		public NWEndpoint (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -107,11 +114,23 @@ namespace Network {
 
 		public string? BonjourServiceDomain => Marshal.PtrToStringAnsi (nw_endpoint_get_bonjour_service_domain (GetCheckedHandle ()));
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
 		static extern OS_nw_endpoint nw_endpoint_create_url (string url);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public static NWEndpoint? Create (string url)
 		{
 			if (url == null)
@@ -122,11 +141,23 @@ namespace Network {
 			return new NWEndpoint (handle, owns: true);
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
 		static extern IntPtr nw_endpoint_get_url (OS_nw_endpoint endpoint);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public string? Url => Marshal.PtrToStringAnsi (nw_endpoint_get_url (GetCheckedHandle ()));
 	}
 }

src/Network/NWError.cs

@@ -12,13 +12,19 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
 
 namespace Network {
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWError : NativeObject {
 		public NWError (IntPtr handle, bool owns) : base (handle, owns)
 		{

src/Network/NWEstablishmentReport.cs

@@ -13,6 +13,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -24,7 +25,13 @@ using nw_protocol_definition_t=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWEstablishmentReport : NativeObject {
 
 		internal NWEstablishmentReport (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWEthernetChannel.cs

@@ -14,6 +14,7 @@ using System;
 using System.Text;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -24,10 +25,16 @@ using OS_dispatch_data=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[NoWatch, NoTV, NoiOS, Mac (10,15)]
+#endif
 	public delegate void NWEthernetChannelReceiveDelegate (DispatchData? content, ushort vlanTag, string? localAddress, string? remoteAddress);
 
+#if !NET
 	[NoWatch, NoTV, NoiOS, Mac (10,15)]
+#else
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWEthernetChannel : NativeObject {
 
 		internal NWEthernetChannel (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWFramer.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -29,7 +30,13 @@ namespace Network {
 	public delegate nuint NWFramerParseCompletionDelegate (Memory<byte> buffer, [MarshalAs (UnmanagedType.I1)] bool isCompleted);
 	public delegate nuint NWFramerInputDelegate (NWFramer framer); 
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWFramer : NativeObject {
 		internal NWFramer (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWFramerMessage.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -26,7 +27,13 @@ using OS_nw_parameters=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWFramerMessage : NWProtocolMetadata {
 		internal NWFramerMessage (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWIPMetadata.cs

@@ -13,10 +13,16 @@ using System;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
+using System.Runtime.Versioning;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWIPMetadata : NWProtocolMetadata {
 
 		internal NWIPMetadata (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWInterface.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,8 +21,13 @@ using OS_nw_interface=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWInterface : NativeObject {
 		public NWInterface (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWListener.cs

@@ -11,14 +11,20 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWListener : NativeObject {
 		bool connectionHandlerWasSet = false;
 		object connectionHandlerLock = new object ();
@@ -234,15 +240,33 @@ namespace Network {
 			nw_listener_set_advertise_descriptor (GetCheckedHandle (), descriptor.GetHandle ());
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern uint nw_listener_get_new_connection_limit (IntPtr listener);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern void nw_listener_set_new_connection_limit (IntPtr listener, uint new_connection_limit);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public uint ConnectionLimit {
 			get => nw_listener_get_new_connection_limit (GetCheckedHandle ());
 			set => nw_listener_set_new_connection_limit (GetCheckedHandle (), value);

src/Network/NWMulticastGroup.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -10,8 +11,15 @@ using OS_nw_endpoint=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (14,0), Mac (11,0), iOS (14,0), Watch (7,0)]
 	[MacCatalyst (14,0)]
+#else
+	[SupportedOSPlatform ("ios14.0")]
+	[SupportedOSPlatform ("tvos14.0")]
+	[SupportedOSPlatform ("macos11.0")]
+	[SupportedOSPlatform ("maccatalyst14.0")]
+#endif
 	public class NWMulticastGroup : NativeObject {
 		internal NWMulticastGroup (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWParameters.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,8 +21,13 @@ using nw_parameters_t=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWParameters : NativeObject {
 		public NWParameters (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -176,11 +182,19 @@ namespace Network {
 		}
 
 #if MONOMAC
+#if !NET
 		[NoWatch, NoTV, NoiOS, Mac (10,15)]
+#else
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		unsafe static extern IntPtr nw_parameters_create_custom_ip (byte custom_ip_protocol_number, BlockLiteral *configure_ip);
 
+#if !NET
 		[NoWatch, NoTV, NoiOS, Mac (10,15)]
+#else
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[BindingImpl (BindingImplOptions.Optimizable)]
 		public unsafe static NWParameters CreateCustomIP (byte protocolNumber, Action<NWProtocolOptions>? configureCustomIP = null)
 		{
@@ -476,16 +490,34 @@ namespace Network {
 			set => nw_parameters_set_include_peer_to_peer (GetCheckedHandle (), value);
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		[return: MarshalAs (UnmanagedType.I1)]
 		static extern bool nw_parameters_get_prohibit_constrained (IntPtr parameters);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern void nw_parameters_set_prohibit_constrained (IntPtr parameters, [MarshalAs (UnmanagedType.I1)] bool prohibit_constrained);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public bool ProhibitConstrained {
 			get => nw_parameters_get_prohibit_constrained (GetCheckedHandle ());
 			set => nw_parameters_set_prohibit_constrained (GetCheckedHandle (), value);

src/Network/NWPath.cs

@@ -12,14 +12,20 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWPath : NativeObject {
 		public NWPath (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -124,15 +130,33 @@ namespace Network {
 			}
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		[return: MarshalAs (UnmanagedType.I1)]
 		static extern bool nw_path_is_constrained (IntPtr path);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public bool IsConstrained => nw_path_is_constrained (GetCheckedHandle ());
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern void nw_path_enumerate_gateways (IntPtr path, ref BlockLiteral enumerate_block);
 
@@ -149,7 +173,13 @@ namespace Network {
 			}
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[BindingImpl (BindingImplOptions.Optimizable)]
 		public void EnumerateGateways (Action<NWEndpoint> callback)
 		{
@@ -166,13 +196,27 @@ namespace Network {
 			}
 		}
 
+#if !NET
 		[iOS (14,2)][TV (14,2)][Watch (7,1)][Mac (11,0)]
 		[MacCatalyst (14,2)]
+#else
+		[SupportedOSPlatform ("ios14.2")]
+		[SupportedOSPlatform ("tvos14.2")]
+		[SupportedOSPlatform ("macos11.0")]
+		[SupportedOSPlatform ("maccatalyst14.2")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern NWPathUnsatisfiedReason /* nw_path_unsatisfied_reason_t */ nw_path_get_unsatisfied_reason (IntPtr /* OS_nw_path */ path);
 
+#if !NET
 		[iOS (14,2)][TV (14,2)][Watch (7,1)][Mac (11,0)]
 		[MacCatalyst (14,2)]
+#else
+		[SupportedOSPlatform ("ios14.2")]
+		[SupportedOSPlatform ("tvos14.2")]
+		[SupportedOSPlatform ("macos11.0")]
+		[SupportedOSPlatform ("maccatalyst14.2")]
+#endif
 		public NWPathUnsatisfiedReason GetUnsatisfiedReason ()
 		{
 			return nw_path_get_unsatisfied_reason (GetCheckedHandle ());

src/Network/NWPathMonitor.cs

@@ -12,14 +12,20 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWPathMonitor : NativeObject {
 		public NWPathMonitor (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWProtocolDefinition.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,8 +21,13 @@ using OS_nw_protocol_definition=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolDefinition : NativeObject {
 		public NWProtocolDefinition (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -78,20 +84,44 @@ namespace Network {
 
 		public static NWProtocolDefinition CreateTlsDefinition () => new NWProtocolDefinition (nw_protocol_copy_tls_definition (), owns: true);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern OS_nw_protocol_definition nw_protocol_copy_ws_definition ();
 
 #if !XAMCORE_4_0
+#if !NET
 		[Obsolete ("Use 'CreateWebSocketDefinition' method instead.")]
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+		[Obsolete ("Use 'CreateWebSocketDefinition' method instead.", DiagnosticId = "BI1234", UrlFormat = "https://github.com/xamarin/xamarin-macios/wiki/Obsolete")]
+#endif
 		public static NWProtocolDefinition WebSocketDefinition => new NWProtocolDefinition (nw_protocol_copy_ws_definition (), owns: true);
 #endif
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public static NWProtocolDefinition CreateWebSocketDefinition () => new NWProtocolDefinition (nw_protocol_copy_ws_definition (), owns: true);
 
+#if !NET
 		[TV (13,0), Mac (10,15)]
+#else
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		static extern unsafe OS_nw_protocol_definition nw_framer_create_definition (string identifier, NWFramerCreateFlags flags, ref BlockLiteral start_handler);
 		delegate NWFramerStartResult nw_framer_create_definition_t (IntPtr block, IntPtr framer);
@@ -109,7 +139,13 @@ namespace Network {
 			return NWFramerStartResult.Unknown;
 		}
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[BindingImpl (BindingImplOptions.Optimizable)]
 		public static NWProtocolDefinition CreateFramerDefinition (string identifier, NWFramerCreateFlags flags, Func<NWFramer, NWFramerStartResult> startCallback)
 		{

src/Network/NWProtocolIPOptions.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,7 +22,13 @@ using IntPtr=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWProtocolIPOptions : NWProtocolOptions {
 		internal NWProtocolIPOptions (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWProtocolMetadata.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -22,8 +23,13 @@ using nw_service_class_t=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolMetadata : NativeObject {
 
 		[DllImport (Constants.NetworkLibrary)]
@@ -196,20 +202,44 @@ namespace Network {
 		}
 #endif
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		[return: MarshalAs (UnmanagedType.I1)]
 		internal static extern bool nw_protocol_metadata_is_framer_message (OS_nw_protocol_metadata metadata);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public bool IsFramerMessage => nw_protocol_metadata_is_framer_message (GetCheckedHandle ());
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		[return: MarshalAs (UnmanagedType.I1)]
 		internal static extern bool nw_protocol_metadata_is_ws (OS_nw_protocol_metadata metadata);
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		public bool IsWebSocket => nw_protocol_metadata_is_ws (GetCheckedHandle ());
 	}
 }

src/Network/NWProtocolOptions.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,8 +22,13 @@ using IntPtr=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolOptions : NativeObject {
 		public NWProtocolOptions (IntPtr handle, bool owns) : base (handle, owns) {}
 
@@ -107,12 +113,26 @@ namespace Network {
 		}
 
 
+#if !NET
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+#endif
 		[DllImport (Constants.NetworkLibrary)]
 		internal static extern void nw_ip_options_set_local_address_preference (IntPtr options, NWIPLocalAddressPreference preference);
 
+#if !NET
 		[Obsolete ("Use the 'NWProtocolIPOptions' class instead.")]
 		[TV (13,0), Mac (10,15), iOS (13,0)]
+#else
+		[SupportedOSPlatform ("ios13.0")]
+		[SupportedOSPlatform ("tvos13.0")]
+		[SupportedOSPlatform ("macos10.15")]
+		[UnsupportedOSPlatform ("maccatalystq")]
+		[Obsolete ("Use the 'NWProtocolIPOptions' class instead.", DiagnosticId = "BI1234", UrlFormat = "https://github.com/xamarin/xamarin-macios/wiki/Obsolete")]
+#endif
 		public NWIPLocalAddressPreference IPLocalAddressPreference {
 			set => nw_ip_options_set_local_address_preference (GetCheckedHandle (), value);
 		}

src/Network/NWProtocolStack.cs

@@ -11,6 +11,7 @@
 
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -23,8 +24,13 @@ using nw_protocol_options_t=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0)]
 	[Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolStack : NativeObject {
 		public NWProtocolStack (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWProtocolTcpOptions.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,7 +22,12 @@ using IntPtr=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolTcpOptions : NWProtocolOptions {
 		
 		internal NWProtocolTcpOptions (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWProtocolTlsOptions.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,7 +22,12 @@ using IntPtr=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolTlsOptions : NWProtocolOptions {
 		internal NWProtocolTlsOptions (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWProtocolUdpOptions.cs

@@ -14,10 +14,16 @@ using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
 using Security;
+using System.Runtime.Versioning;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWProtocolUdpOptions : NWProtocolOptions {
 		internal NWProtocolUdpOptions (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWTcpMetadata.cs

@@ -13,10 +13,16 @@ using System;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
+using System.Runtime.Versioning;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWTcpMetadata : NWProtocolMetadata {
 
 		internal NWTcpMetadata (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWTlsMetadata.cs

@@ -14,10 +14,16 @@ using ObjCRuntime;
 using Foundation;
 using Security;
 using CoreFoundation;
+using System.Runtime.Versioning;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWTlsMetadata : NWProtocolMetadata {
 
 		internal NWTlsMetadata (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWTxtRecord.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using System.Text;
 using ObjCRuntime;
 using Foundation;
@@ -24,8 +25,13 @@ using OS_nw_txt_record=System.IntPtr;
 
 namespace Network {
 
-
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWTxtRecord : NativeObject {
 		internal NWTxtRecord (IntPtr handle, bool owns) : base (handle, owns) { }
 

src/Network/NWUdpMetadata.cs

@@ -14,10 +14,16 @@ using ObjCRuntime;
 using Foundation;
 using Security;
 using CoreFoundation;
+using System.Runtime.Versioning;
 
 namespace Network {
 
+#if !NET
 	[TV (12,0), Mac (10,14), iOS (12,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios12.0")]
+	[SupportedOSPlatform ("tvos12.0")]
+#endif
 	public class NWUdpMetadata : NWProtocolMetadata {
 
 		internal NWUdpMetadata (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWWebSocketMetadata.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -22,7 +23,13 @@ using dispatch_queue_t =System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWWebSocketMetadata : NWProtocolMetadata {
 
 		internal NWWebSocketMetadata (IntPtr handle, bool owns) : base (handle, owns) {}

src/Network/NWWebSocketOptions.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -21,7 +22,13 @@ using nw_ws_request_t=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWWebSocketOptions : NWProtocolOptions {
 		bool autoReplyPing = false;
 		bool skipHandShake = false;

src/Network/NWWebSocketRequest.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,7 +21,13 @@ using OS_nw_ws_request=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWWebSocketRequest : NativeObject {
 		internal NWWebSocketRequest (IntPtr handle, bool owns) : base (handle, owns) {}
 

src/Network/NWWebSocketResponse.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
 using ObjCRuntime;
 using Foundation;
 using CoreFoundation;
@@ -20,7 +21,13 @@ using OS_nw_ws_response=System.IntPtr;
 
 namespace Network {
 
+#if !NET
 	[TV (13,0), Mac (10,15), iOS (13,0), Watch (6,0)]
+#else
+	[SupportedOSPlatform ("ios13.0")]
+	[SupportedOSPlatform ("tvos13.0")]
+	[SupportedOSPlatform ("macos10.15")]
+#endif
 	public class NWWebSocketResponse : NativeObject {
 
 		internal NWWebSocketResponse (IntPtr handle, bool owns) : base (handle, owns) {}