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.

System

System.CodeDom.Compiler

System.Collections.Specialized

System.Configuration

System.Console

System.Data.Common

System.Diagnostics.Process

System.IO

System.IO.Pipes

System.Media

System.Net

* .NET 9 and later versions.

System.Net.NetworkInformation

System.Net.Sockets

System.Net.WebSockets

System.Reflection

System.Runtime.CompilerServices

System.Runtime.InteropServices

System.Runtime.Serialization

* .NET 9 and later versions. † .NET 8 only for all project types except Windows Forms and WPF.

System.Security

System.Security.Claims

System.Security.Cryptography

System.Security.Cryptography.Pkcs

System.Security.Cryptography.X509Certificates

System.Security.Authentication.ExtendedProtection

System.Security.Policy

System.ServiceProcess.ServiceController

System.Text.RegularExpressions

System.Threading

System.Xml

See also

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