Core.AspNet.Web.Forms 1.0.0.26263

Core.AspNet.Web

System.Web itself, ported to .NET 10 from the Mono sources: pages and controls, the HTTP pipeline, handlers and modules, session, caching, membership, and the WebForms page framework.

<PackageReference Include="Core.AspNet.Web.Forms" Version="1.0.0" />

Most applications should reference Core.AspNet.Web.Hosting.Kestrel instead, which brings this in along with the host and the build assets that make it work.

Assembly vs package name. The package is Core.AspNet.Web.Forms; the assembly inside it is Core.Web. .NET ships an empty System.Web.dll facade in Microsoft.NETCore.App and the host gives the shared framework precedence, so an app-local System.Web.dll is never loaded — the port therefore cannot use the original assembly names. Namespaces are unchanged, so your code and Inherits= attributes are unaffected; only web.config entries that name an assembly need updating.

What is inside

• System.Web.UI — Page, Control, UserControl, MasterPage, view state, postback
• System.Web.UI.WebControls / .HtmlControls — the server-control library
• System.Web — HttpContext, HttpRequest/HttpResponse, HttpApplication, modules, handlers
• System.Web.Caching, System.Web.SessionState (in-process), System.Web.Security
• System.Web.Routing — Route, RouteTable, UrlRoutingModule
• System.Web.Compilation — BuildManager, the build providers, App_Code

Notable replacements

• Compilation. CodeDomProvider's compile half throws PlatformNotSupportedException on .NET Core, so a Roslyn-based compiler supplies it. The codegen half is untouched. Both C# and VB pages compile.
• BinaryFormatter is gone on .NET 8+, so view state and session objects with no native encoding are refused with a diagnostic naming the type rather than silently re-encoded. Callers opt in through WebFormsOptions.StateSerializer.
• machine.config and the root web.config are embedded as resources and extracted at runtime. The root configuration is what maps *.aspx to PageHandlerFactory; without it nothing is served.

This assembly requires Core.AspNet.Configuration — the shipping System.Configuration.ConfigurationManager package cannot substitute for it.

Documentation

PORTING-GUIDE.md (step-by-step migration from IIS) and LIMITATIONS.md (what differs from ASP.NET on .NET Framework, and why) ship in the repository.

Licence

MIT, as the upstream Mono sources this is built from and the code written for this port. THIRD-PARTY-NOTICES.md ships in the package and says which part is which.