BLAZOR not loading with .Net 8 upgrading from .Net 7

Question

My team has developed a Blazor web app in .net 7. Due to our web servers requirements the entire App had to be upgraded to .net 8. Now, the app gets to the 100 in a circle view but never loads the content. When looking in the console found the following message.

Error: Failed to start platform. Reason: TypeError: Cannot read properties of undefined (reading 'AspNetCore')

I have tried to clear the cached in visual studio and in the browser, that didn't help

Answer 1

did you update the nuget packages?

https://learn.microsoft.com/en-us/aspnet/core/migration/70-80?view=aspnetcore-8.0&tabs=visual-studio

Answer 2

Hi @Lopez, Carlos,

Here are several steps you can take to troubleshoot and resolve this issue:

• Make sure all your NuGet packages are updated to versions that are compatible with .NET 8. You can run command in Package Manager Console to check:

    dotnet list package --outdated
  

• Try to manually remove all the Bin and Obj directories in the projects.
• Ensure that none of the APIs you're using have been deprecated in .NET 8. This includes any third-party libraries or components.
• Clear the browser cache, local storage and session storage.
• After checking all above, Right-click the project to clean and rebuild the project.
• If all the steps not working, please follow the official document step by step to check if you miss something which you need upgrade the project to .NET 8. Then clean and rebuild the project again.

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Best regards,
Rena