Are generic type constraints possible in blazor?

From ASP.NET Core 6.0 onwards, you can use the following syntax to specify generic type constraints:

@typeparam TModel where TModel : IModel

The solution is to put the type constraint additionally in a partial code behind class. It works!

Indeed, the answer posted by Sven works, but there is one modification I needed to do - add <RazorLangVersion>3.0</RazorLangVersion> to my .csproj file. After that the project was compiled. So here are my complete files:

1. Project.cs

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <RazorLangVersion>3.0</RazorLangVersion> <!-- Important -->
    <Nullable>enable</Nullable>
    <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
  </PropertyGroup>
</Project>

2. Razor component

@typeparam TViewModel
@inherits PageBase<TViewModel>

<h3>Some text</h3>

3. Corebehind

public abstract partial class AuthenticatedPageBase<TViewModel>
    where TViewModel : ViewModelBase
{
}

EDIT: Well, after deleting the <RazorLangVersion> tag from the csproj file it still seems to work.