Using inline C# in the browser as an alternative to Javascript: a step-by-step guide

Recently, I came across Microsoft's Blazor, a tool that enables running C# code in the browser. After checking out some tutorials, it appears that an ASP.NET Core backend server is required for it to function properly. It would be interesting if we could directly input C# code in the browser like:

<script>

    //C# code
    string myName = "John";
    alert(myName);

</script>

instead of

<script>

    //Javascript code
    var myName = "John";
    alert(myName);

</script>

Is there a way to achieve this?

javascriptc#asp.netblazor

Answer №1

Sorry, it's not as simple as putting C# code in a script tag. Browsers aren't equipped to interpret and execute C# code. Blazor takes a different approach by compiling C# code (on the server) into .NET assemblies, which are then executed in the browser using WebAssembly. For more information, check out the Blazor introduction. Here's some relevant information:

In Blazor, apps are structured around components. A component can be any UI element like a page, dialog, or form.

...

Usually, a component is written as a Razor markup file with a .razor extension. These components are known as Razor components and use a syntax that combines HTML markup with C# code for developer convenience. With Razor, you can seamlessly switch between HTML and C# within the same file, aided by IntelliSense support. Razor Pages and MVC also utilize Razor. However, unlike Razor Pages and MVC which follow a request/response pattern, components are tailored for client-side UI logic and assembly.

The following snippet showcases a sample component (Dialog.razor) that can be nested inside another component:

<div>
    <h1>@Title</h1>

    @ChildContent

    <button @onclick="OnYes">Yes!</button>
</div>

@code {
    [Parameter]
    public string Title { get; set; }

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    private void OnYes()
    {
        Console.WriteLine("Write to the console in C#! 'Yes' button was selected.");
    }
}

Additionally:

When a Blazor WebAssembly app is compiled and launched in a web browser:

  • C# files and Razor files are transformed into .NET assemblies.
  • The browser fetches these assemblies along with the .NET runtime.
  • Blazor WebAssembly initializes the .NET runtime and sets up the environment to load the app's assemblies. To interact with the DOM and browser APIs, Blazor WebAssembly uses JavaScript interop.

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