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Creating a new project

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The easiest way to get started is to create a Blazor Web App via Visual Studio.

  1. Open Visual Studio.
  2. Click Create a new project.
  3. In the search box type Blazor.
  4. Select Blazor Web App.
  5. Click Next.
  6. Enter a project name, such as MyFirstBlazorApp.
  7. Click Next.
  8. Enter the following information
    • Framework: .NET 10 (or the latest version installed).
    • Authentication type: None
    • Configure for HTTPS: Checked
    • Interactive render mode: Server
    • Interactivity location: Global
    • Include sample pages: Checked
    • (Other options remain unchecked)
  9. Click Create.

Using the CLI

To create the same project from the command line:

dotnet new blazor --interactivity Server --all-interactive -n MyFirstBlazorApp

The --all-interactive flag makes every page interactive by default, matching the Global interactivity location chosen in Visual Studio. Without it, interactivity is per-page/component and you must add @rendermode directives manually.

Understanding the options

The Interactive render mode sets the default interactivity:

  • None - Static SSR only. Pages render as static HTML with no event handling.
  • Server - Interactive Server as the default render mode.
  • WebAssembly - Interactive WebAssembly as the default render mode. Adds a .Client project.
  • Auto - Interactive Auto (Server first, WebAssembly after download). Adds a .Client project.

Interactivity location controls whether interactivity is global (every component interactive by default) or per-page/component (you opt in using @rendermode).

The generated project structure

After creation, you will see:

  • Program.cs - Application entry point where services are registered and the pipeline is configured.
  • App.razor - The root HTML document component containing <html>, <head>, and <body>.
  • Routes.razor - The Router component that handles URL matching and page rendering.
  • Components/Pages/ - Contains the application's pages (e.g. Home.razor, Counter.razor).
  • Components/Layout/ - Contains layout components (e.g. MainLayout.razor, NavMenu.razor).
  • wwwroot/ - Static web assets (CSS, images, JavaScript).