APIs that always throw exceptions on .NET Core and .NET 5+

The following APIs will always throw an exception on .NET (Core) on all or a subset of platforms. In most cases, the exception that's thrown is PlatformNotSupportedException.

This article organizes the affected APIs by namespace.

Note

• This article is a work-in-progress. It is not a complete list of APIs that throw exceptions on .NET 5+.
• This article does not include the explicit interface implementations for binary serialization that throw on .NET 5+. For more information, see Binary serialization in .NET Core.

System

Member	Platforms that throw
AppDomain.CreateDomain	All
AppDomain.ExecuteAssembly(String, String[], Byte[], AssemblyHashAlgorithm)	All
AppDomain.Unload(AppDomain)	All
Console.CapsLock	Linux and macOS
Console.NumberLock	Linux and macOS
Delegate.GetObjectData(SerializationInfo, StreamingContext)	All
Exception.SerializeObjectState	All
MarshalByRefObject.GetLifetimeService()	All
MarshalByRefObject.InitializeLifetimeService()	All
OperatingSystem.GetObjectData(SerializationInfo, StreamingContext)	All
Type.ReflectionOnlyGetType(String, Boolean, Boolean)	All

System.CodeDom.Compiler

Member	Platforms that throw
CodeDomProvider.CompileAssemblyFromDom	All
CodeDomProvider.CompileAssemblyFromFile	All
CodeDomProvider.CompileAssemblyFromSource	All

System.Collections.Specialized

Member	Platforms that throw
NameObjectCollectionBase(SerializationInfo, StreamingContext)	All
NameObjectCollectionBase.GetObjectData(SerializationInfo, StreamingContext)	All
NameObjectCollectionBase.OnDeserialization(Object)	All

System.Configuration

Member	Platforms that throw
System.Configuration.RsaProtectedConfigurationProvider (all members)	All

System.Console

Member	Platforms that throw
Console.Beep()	Linux and macOS
Console.BufferHeight (set only)	Linux and macOS
Console.BufferWidth (set only)	Linux and macOS
Console.CursorSize (set only)	Linux and macOS
Console.CursorVisible (get only)	Linux and macOS
Console.MoveBufferArea	Linux and macOS
Console.SetWindowPosition	Linux and macOS
Console.SetWindowSize	Linux and macOS
Console.Title (get only)	Linux and macOS
Console.WindowHeight (set only)	Linux and macOS
Console.WindowLeft (set only)	Linux and macOS
Console.WindowTop (set only)	Linux and macOS
Console.WindowWidth (set only)	Linux and macOS

System.Data.Common

Member	Platforms that throw
DbDataReader.GetSchemaTable (throws NotSupportedException)	All

System.Diagnostics.Process

Member	Platforms that throw
Process.MaxWorkingSet (set only)	Linux
Process.MinWorkingSet (set only)	Linux
Process.ProcessorAffinity	macOS
Process.MainWindowHandle	Linux and macOS
Process.Start(String, String, String, SecureString, String)	Linux and macOS
Process.Start(String, String, SecureString, String)	Linux and macOS
ProcessStartInfo.UserName	Linux and macOS
ProcessStartInfo.PasswordInClearText	Linux and macOS
ProcessStartInfo.Domain	Linux and macOS
ProcessStartInfo.LoadUserProfile	Linux and macOS
ProcessThread.BasePriority (set only)	Linux and macOS
ProcessThread.BasePriority (get only)	macOS
ProcessThread.ProcessorAffinity (set only)	Linux and macOS

System.IO

Member	Platforms that throw
FileSystemInfo(SerializationInfo, StreamingContext)	All
FileSystemInfo.GetObjectData(SerializationInfo, StreamingContext)	All

System.IO.Pipes

Member	Platforms that throw
NamedPipeClientStream.NumberOfServerInstances	Linux and macOS
NamedPipeServerStream.GetImpersonationUserName()	Linux and macOS
PipeStream.InBufferSize	Linux and macOS
PipeStream.OutBufferSize	Linux and macOS
PipeStream.ReadMode (set only)	Linux and macOS
PipeStream.WaitForPipeDrain()	Linux and macOS

System.Media

Member	Platforms that throw
SoundPlayer(SerializationInfo, StreamingContext)	All

System.Net

Member	Platforms that throw
AuthenticationManager.Authenticate(String, WebRequest, ICredentials)	All
AuthenticationManager.PreAuthenticate(WebRequest, ICredentials)	All
FileWebRequest(SerializationInfo, StreamingContext)	All
FileWebRequest.GetObjectData(SerializationInfo, StreamingContext)	All
FileWebResponse(SerializationInfo, StreamingContext)	All
FileWebResponse.GetObjectData(SerializationInfo, StreamingContext)	All
HttpWebRequest(SerializationInfo, StreamingContext)	All
HttpWebRequest.GetObjectData(SerializationInfo, StreamingContext)	All
HttpWebResponse(SerializationInfo, StreamingContext)	All
HttpWebResponse.GetObjectData(SerializationInfo, StreamingContext)	All
WebProxy(SerializationInfo, StreamingContext)	All
WebProxy.GetDefaultProxy()	All
WebProxy.GetObjectData	All
WebRequest(SerializationInfo, StreamingContext)	All
WebRequest.GetObjectData(SerializationInfo, StreamingContext)	All
WebResponse(SerializationInfo, StreamingContext)	All
WebResponse.GetObjectData(SerializationInfo, StreamingContext)	All

System.Net.NetworkInformation

Member	Platforms that throw
Ping.Send	Windows (UWP)

System.Net.Sockets

Member	Platforms that throw
Socket(SocketInformation)	All
Socket.DuplicateAndClose(Int32)	All

System.Net.WebSockets

Member	Platforms that throw
WebSocket.RegisterPrefixes()	All

System.Reflection

Member	Platforms that throw
Assembly.CodeBase	All
Assembly.EscapedCodeBase	All
Assembly.LoadFrom(String, Byte[], AssemblyHashAlgorithm)	All
Assembly.ReflectionOnlyLoad	All
Assembly.ReflectionOnlyLoadFrom(String)	All
AssemblyName.GetObjectData(SerializationInfo, StreamingContext)	All
AssemblyName.KeyPair	All
AssemblyName.OnDeserialization(Object)	All
StrongNameKeyPair	All
StrongNameKeyPair.PublicKey	All

System.Runtime.CompilerServices

Member	Platforms that throw
DebugInfoGenerator.CreatePdbGenerator()	All

System.Runtime.InteropServices

Member	Platforms that throw
IDispatchImplAttribute	All
Marshal.GetIDispatchForObject(Object)	All
RuntimeEnvironment.SystemConfigurationFile	All
RuntimeEnvironment.GetRuntimeInterfaceAsIntPtr(Guid, Guid)	All
RuntimeEnvironment.GetRuntimeInterfaceAsObject(Guid, Guid)	All
WindowsRuntimeMarshal.StringToHString(String)	Linux and macOS
WindowsRuntimeMarshal.PtrToStringHString(IntPtr)	Linux and macOS
WindowsRuntimeMarshal.FreeHString(IntPtr)	Linux and macOS

System.Runtime.Serialization

Member	Platforms that throw
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream, Object)*	All
BinaryFormatter.Deserialize(Stream)*	All
XsdDataContractExporter.Schemas	All

* .NET 8 and later versions only for all project types except Windows Forms and WPF.

System.Security

Member	Platforms that throw
CodeAccessPermission.Deny()	All
CodeAccessPermission.PermitOnly()	All
PermissionSet.ConvertPermissionSet(String, Byte[], String)	All
PermissionSet.Deny()	All
PermissionSet.PermitOnly()	All
SecurityContext.Capture()	All
SecurityContext.CreateCopy()	All
SecurityContext.Dispose()	All
SecurityContext.IsFlowSuppressed()	All
SecurityContext.IsWindowsIdentityFlowSuppressed()	All
SecurityContext.RestoreFlow()	All
SecurityContext.Run(SecurityContext, ContextCallback, Object)	All
SecurityContext.SuppressFlow()	All
SecurityContext.SuppressFlowWindowsIdentity()	All

System.Security.Claims

Member	Platforms that throw
ClaimsPrincipal(SerializationInfo, StreamingContext)	All
ClaimsPrincipal.GetObjectData(SerializationInfo, StreamingContext)	All
ClaimsIdentity(SerializationInfo)	All
ClaimsIdentity(SerializationInfo, StreamingContext)	All
ClaimsIdentity.GetObjectData(SerializationInfo, StreamingContext)	All

System.Security.Cryptography

Member	Platforms that throw
AsymmetricAlgorithm.Create(String)	All
System.Security.Cryptography.CngAlgorithm	Linux and macOS
System.Security.Cryptography.CngAlgorithmGroup	Linux and macOS
System.Security.Cryptography.CngKey	Linux and macOS
System.Security.Cryptography.CngKeyBlobFormat	Linux and macOS
System.Security.Cryptography.CngKeyCreationParameters	Linux and macOS
System.Security.Cryptography.CngProvider	Linux and macOS
System.Security.Cryptography.CngUIPolicy	Linux and macOS
CryptoConfig.EncodeOID(String)	All
CspKeyContainerInfo	Linux and macOS
CspKeyContainerInfo.Accessible	Linux and macOS
CspKeyContainerInfo.Exportable	Linux and macOS
CspKeyContainerInfo.HardwareDevice	Linux and macOS
CspKeyContainerInfo.KeyContainerName	Linux and macOS
CspKeyContainerInfo.KeyNumber	Linux and macOS
CspKeyContainerInfo.MachineKeyStore	Linux and macOS
CspKeyContainerInfo.Protected	Linux and macOS
CspKeyContainerInfo.ProviderName	Linux and macOS
CspKeyContainerInfo.ProviderType	Linux and macOS
CspKeyContainerInfo.RandomlyGenerated	Linux and macOS
CspKeyContainerInfo.Removable	Linux and macOS
CspKeyContainerInfo.UniqueKeyContainerName	Linux and macOS
ECDiffieHellmanCng.FromXmlString(String, ECKeyXmlFormat)	All
ECDiffieHellmanCng.ToXmlString(ECKeyXmlFormat)	All
ECDiffieHellmanCngPublicKey.FromXmlString(String)	All
ECDiffieHellmanCngPublicKey.ToXmlString()	All
ECDiffieHellmanPublicKey.ToByteArray()	Linux and macOS
ECDiffieHellmanPublicKey.ToXmlString()	All
ECDsaCng.FromXmlString(String, ECKeyXmlFormat)	All
ECDsaCng.ToXmlString(ECKeyXmlFormat)	All
HashAlgorithm.Create()	All
HMAC.Create()	All
HMAC.Create(String)	All
HMAC.HashCore	All
HMAC.HashFinal	All
HMAC.Initialize	All
KeyedHashAlgorithm.Create()	All
KeyedHashAlgorithm.Create(String)	All
ProtectedData.Protect	Linux and macOS
ProtectedData.Unprotect	Linux and macOS
System.Security.Cryptography.RSACryptoServiceProvider.DecryptValue(Byte[])	All
System.Security.Cryptography.RSACryptoServiceProvider.EncryptValue(Byte[])	All
System.Security.Cryptography.RSA.DecryptValue(Byte[])	All
System.Security.Cryptography.RSA.EncryptValue(Byte[])	All
RSA.FromXmlString	All
RSA.ToXmlString	All
SymmetricAlgorithm.Create()	All
SymmetricAlgorithm.Create(String)	All

System.Security.Cryptography.Pkcs

Member	Platforms that throw
CmsSigner(CspParameters)	All
SignerInfo.ComputeCounterSignature()	All

System.Security.Cryptography.X509Certificates

Member	Platforms that throw
X509Certificate(SerializationInfo, StreamingContext)	All
X509Certificate.Import	All
X509Certificate2(SerializationInfo, StreamingContext)	All
X509Certificate2.PrivateKey (set only)	All

System.Security.Authentication.ExtendedProtection

Member	Platforms that throw
ExtendedProtectionPolicy(SerializationInfo, StreamingContext)	All

System.Security.Policy

Member	Platforms that throw
Hash.GetObjectData(SerializationInfo, StreamingContext)	All

System.ServiceProcess.ServiceController

Member	Platforms that throw
TimeoutException(SerializationInfo, StreamingContext)	All

System.Text.RegularExpressions

Member	Platforms that throw
Regex.CompileToAssembly	All

System.Threading

Member	Platforms that throw
CompressedStack.GetObjectData(SerializationInfo, StreamingContext)	All
ExecutionContext.GetObjectData(SerializationInfo, StreamingContext)	All
Thread.Abort	All
Thread.ResetAbort()	All
Thread.Resume()	All
Thread.Suspend()	All

System.Xml

Member	Platforms that throw
XmlDictionaryReader.CreateMtomReader(Byte[], Int32, Int32, Encoding[], String, XmlDictionaryReaderQuotas, Int32, OnXmlDictionaryReaderClose)	All
XmlDictionaryReader.CreateMtomReader(Stream, Encoding[], String, XmlDictionaryReaderQuotas, Int32, OnXmlDictionaryReaderClose)	All
XmlDictionaryWriter.CreateMtomWriter(Stream, Encoding, Int32, String, String, String, Boolean, Boolean)	All

See also

• Breaking changes for migration from .NET Framework to .NET Core
• Binary serialization in .NET Core
• .NET portability analyzer