Migration system.web.UI from .net 4.8 to .net core 8

Question

Hi Guys,

I am migrating a .NET 4.8 application to .NET Core 8, but my application uses System.Web.UI controls, which is causing errors during the migration. Could you please suggest how I can migrate System.Web.UI to .NET 8?

Answer 1

Hi @Rahul vyas,

For System.Web.UI controls, it seems you use ASP.NET Web Forms application and it applies for .NET Framework, instead of .Net Core. ASP.NET Web Forms are not supported in .NET Core or .NET 8.

To achieve the similar behavior in .Net Core application, You could try to use ViewComponent or Partial View. Besides, you could also consider creating custom tag helper to render multiple html elements.

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Best regards,
Rena

Answer 2

System.Web.UI are the asp.net webform controls. in asp.net 4.8 MVC actions or views you could instantiate and call the render method. This library was not ported to .net core (net 8). You will need to find a replacement technology. here are some common replacements:

razor components

https://learn.microsoft.com/en-us/aspnet/core/blazor/components/integration?view=aspnetcore-8.0#use-non-routable-components-in-pages-or-views

tag helpers:

https://learn.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/authoring?view=aspnetcore-8.0

html helpers

https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.viewfeatures.htmlhelper?view=aspnetcore-8.0

note: a common webform component was SSRS control. this has not been ported to .net 8. google for workarounds or replacement commercial (paid) products