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WebAssembly With .NET

note
  • WebAssembly support for .NET is good thanks to the dotnet WASI SDK.
  • dotnet WASI SDK is an experimental package that can build .NET Core projects (including whole ASP.NET Core applications) into standalone WASI-compliant .wasm files.

Install .NET Preview (7.0.0-preview.4)​

You can download .NET and follow installation instructions here:

https://dotnet.microsoft.com/en-us/download/dotnet/7.0

You'll also need the Experimental WASI SDK for .NET Core available here:

https://github.com/SteveSandersonMS/dotnet-wasi-sdk

.NET code​

First we will have to create a new .NET console application:

dotnet new console -o MyFirstWasiApp

Replace the existing code in the Program.cs file with:

using System;

namespace MyFirstWasiApp
{
    public class Program
    {

        public void fibonacci(ref int num){
            int a=1,b=0,temp;
            while(num >= 0){
                temp=a;
                a=a+b;
                b=temp;
                num--;
            }
            Console.WriteLine("Fibonacci Term is: "+b);
        }

        public static void Main(string[] args)
        {
            Program p = new Program();
            int num=10;
            p.fibonacci(ref num);
        }

    }
}
tip

Access the C# codex repository for code samples, including the fibonacci example. Please also check the following demos: Greenhouse Monitor, ICU Monitor, Confidential Trading.

note

Currently Experimental WASI SDK does not allow to take user input through the console using ReadLine().

Compile .NET​

Import the Wasi.Sdk package so that it has support for WASI bindings.

dotnet add package Wasi.Sdk --prerelease

Build your application now using the following command: 

dotnet build

The Wasm binary will be generate here: bin/Debug/net7.0/MyFirstWasiApp.wasm.

Run with Enarx​

enarx run MyFirstWasiApp.wasm