What are the implications of creating a .Net class within JavaScript code using the Jint engine?

One of the unique features in Jint is the ability to access .Net classes in JS.

JS File Code :

var write = function (msg) {

    var log = System.Console.WriteLine;
    log(msg);
};

C# Code

 Engine jsEngine = new Engine(e=>e.AllowClr());
 string script = System.IO.File.ReadAllText("file1.js");
 jsEngine.Execute(script);
 jsEngine.Invoke("write", "Hello World!");  //Displays in Console: "Hello World!"
  • Have you ever wondered about the magic happening in the background when injecting C# code into a JS file? Which compiler is responsible for compiling it - C# Compiler or JS?
  • When declaring a C# List in a JS file, do you know if the generated object is a JS object or a C# object?

Answer №1

When incorporating C# code, the Jint interpreter recognizes it as a reference to a .NET class and proceeds to execute the code accordingly. Because Jint is built on .NET, it possesses the capability to execute any .NET code that is requested.

Furthermore, Jint does not undergo any compilation process. Instead, it reads each JavaScript statement and methodically evaluates them one by one. Throughout this process, it keeps track of all variables, functions, and other JavaScript elements that are declared and utilized.

Answer №2

Breaking down the steps of the Invoke call:

  1. jsEngine.Invoke triggers Jint to run the write method in JavaScript with the input "Hello World!"
  2. The write method then calls System.Console.WriteLine, prompting Jint to transition from JavaScript to managed code to execute that method.

Here are the answers to your queries:

  1. No external code injection occurs. Your code simply moves between managed and script (interpreted) execution seamlessly.
  2. When you create a C# List object in JS, it becomes an actual managed .Net object.

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