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C# (Wasm)

C# is a high-level, general-purpose, object-oriented programming language developed by Microsoft.

In LiveCodes, C# runs in the browser using Blazor WebAssembly with a WebAssembly-based .NET runtime.

Usage​

Demo:

show code
import { createPlayground } from 'livecodes';

const options = {
  "config": {
    "activeEditor": "script",
    "script": {
      "language": "csharp-wasm",
      "content": "using System;\n\npublic class Program\n{\n    public static void Main()\n    {\n        int[] sortedArray = { 1, 3, 5, 7, 9, 11, 13, 15 };\n        int itemToSearch = 7;\n\n        int result = BinarySearch(sortedArray, 0, sortedArray.Length - 1, itemToSearch);\n\n        if (result == -1)\n        {\n            Console.WriteLine(\"Result: Item not found in the array.\");\n        }\n        else\n        {\n            Console.WriteLine($\"Result: Item found at index -> {result}\");\n        }\n    }\n\n    public static int BinarySearch(int[] arr, int left, int right, int item)\n    {\n        if (right >= left)\n        {\n            int mid = left + (right - left) / 2;\n            if (arr[mid] == item)\n            {\n                return mid;\n            }\n\n            if (arr[mid] > item)\n            {\n                return BinarySearch(arr, left, mid - 1, item);\n            }\n\n            return BinarySearch(arr, mid + 1, right, item);\n        }\n        return -1;\n    }\n}"
    },
    "mode": "simple",
    "editor": "auto",
    "tools": {
      "status": "full"
    }
  }
};
createPlayground('#container', options);

Communication with JavaScript​

The C# code runs in the context of the result page. A few helper properties and methods are available in the browser global livecodes.csharp object:

  • livecodes.csharp.input: The initial standard input passed to the C# code.
  • livecodes.csharp.loaded: A promise that resolves when the C# environment (Blazor WebAssembly) is fully loaded. Other helpers should be used after this promise resolves.
  • livecodes.csharp.output: The standard output from the C# code execution.
  • livecodes.csharp.run: A function that runs the C# code with new input. This function takes a string as input and returns a promise that resolves with an object containing the output, error, and exitCode properties.

Example:

show code
import { createPlayground } from 'livecodes';

const options = {
  "template": "csharp-wasm",
  "params": {
    "activeEditor": "markup"
  }
};
createPlayground('#container', options);

Language Info​

Name​

csharp-wasm

Aliases / Extensions​

cs, csharp, wasm.cs, cs-wasm

Editor​

script

Compiler​

Blazor WebAssembly with .NET WebAssembly runtime.

Version​

.NET 9.0

Code Formatting​

using Prettier

Live Reload​

By default, new code changes are sent to the result page for re-evaluation without a full page reload, avoiding the need to reinitialize the Blazor environment. This behavior can be disabled by adding the code comment // __livecodes_reload__ to the C# code, which forces a full page reload.

This comment can be added in the hiddenContent property of the editor for embedded playgrounds.

Example Usage​

using System;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("Hello, LiveCodes C#!");
    }
}

Starter Template​

https://livecodes.io/?template=csharp-wasm

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