create new .Net Framework 8.1 / .Net 6 console application

install Nuget Packages:

• itext7.pdfhtml
• RazorLight

update csproj by adding the following:

<PropertyGroup>
    <!-- This group contains project properties for RazorLight on .NET Core -->
    <PreserveCompilationContext>true</PreserveCompilationContext>
    <MvcRazorCompileOnPublish>false</MvcRazorCompileOnPublish>
    <MvcRazorExcludeRefAssembliesFromPublish>false</MvcRazorExcludeRefAssembliesFromPublish>
</PropertyGroup>

<PropertyGroup>
    <LangVersion>10.0</LangVersion>
</PropertyGroup>

reload project

build and run code

further reading:

• RazorLight (Razor engine usage outside of ASP.NET)
• This might also work
• Razor & E-Mail templates
• Razor syntax reference
• iText 7 docs and guides
• Hello HTML to PDF