You have two tools for generating your initial UI in a Blazor component: ASP.NET's Razor and Blazor's RenderFragment. Here's how to use both to integrate with your C# code (and a warning about what you can't do).
If you want to add server-side Blazor to your existing ASP.NET Core applications, you can. There's not much to it, fortunately. In fact, there's probably more work involved in creating a View or Page that will play well with your component
Blazor on the Server is coming with .NET Core Version 3.0 in the second half of 2019. Here's what Peter thinks of that (and he's not completely happy).
Blazor, like most systems for generating Web pages, supports using layout pages for repeated content. Here's what works, what doesn't (yet) work and work-arounds I've discovered for what doesn't work.
There are good reasons to keep working with Blazor 0.8.0.0 ... but you're going to need to make some changes.
Blazor is the Microsoft toolset that exploits the WebAssembly standard to let you write C# code that will run in your browser. Here's how to set up Visual Studio 2017 and create your first app.
Here's what a real-world "Hello, World" TypeScript application looks like (beginning with a discussion of whether you need TypeScript at all).
If you like the idea of creating a new class from whatever other classes you have lying around, you have two ways of doing in TypeScript ... and both are type safe (within limits).
If you're wondering how to start integrating TypeScript into your development practices, here's both when to do it and how to do it.