1.1 .net core 2.0
Install the .NET Core 2.1 SDK (2.1.300 or later).
Install Visual Studio 2017 (15.7 or later) with the ASP.NET and web development workload selected.
Install the latest Blazor Language Services extension from the Visual Studio Marketplace. https://blogs.msdn.microsoft.com/webdev/2018/07/25/blazor-0-5-0-experimental-release-now-available/ Blazor 0.5.0 experimental release now available
1.2 .net core 3.0
.NET Core 3.0 SDK
select .NET Core Installer: x64， Download and install it。
Visual Studio 2019 Preview.
Razor Components (Server-Side Blazor)
How do Razor Components work?
The server will execute the component logic server side producing HTML. This is then compared, on the server, to a snap-shot of the DOM currently on the client. From this comparison the changes required to make the DOMs match are produced. These changes are then packaged up and sent down to the browser via the SignalR connection. Once at the browser the HTML changes are unpackaged and applied to the DOM.
not Visual Studio 2019 RC
The latest Blazor extension from the Visual Studio Marketplace.
Blazor Language Services
Install the latest Blazor Language Services extension from the Visual Studio Marketplace. This step makes Blazor templates available to Visual Studio.