net10.0 
namespace System.Security.Permissions
{
    [Flags]
    [Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
    public enum FileIOPermissionAccess
}
nuget.org
0.2 %
Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
3.03.1
.NET Framework
2.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net10.0
Assembly

System.Security.Permissions , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.Security.Permissions.

Package System.Security.Permissions (10.0.1) net10.0
Obsolete SYSLIB0003: Code Access Security is not supported or honored by the runtime.
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API