Setting a js object property from C#?

[jon-heard]

Sorry if this has been asked before. I did try searching.

So engine.SetValue() allows you to set the value of a global variable in the js environment from C#. Is there a convenient way to set a property of a js object through C#? I was hoping that SetValue() could take a path in the name, like engine.SetValue("myObject.myProperty", 3);. However, experimentation has proven that this doesn't work.

This functionality would be very convenient as, at the moment, the best solution I've come up with is this:

engine.SetValue("temporary1", 3);
engine.Execute("myObject.myProperty = temporary1;");

This is unfortunate for a few reasons:

• Polluting the global environment with a temporary variable
• Inefficient call to both SetValue() and Execute()

Thanks for any thoughts on this.

[Genteure]

using Jint;
using Jint.Native;

var engine = new Engine()
    .SetValue("log", new Action<object>(Console.WriteLine));

// ----------------------------
// myObject.myProperty = 3;
engine.Execute(@"var myObject = {}");

var myObject = (JsObject)engine.GetValue("myObject");
myObject.Set("myProperty", 3);
// or
myObject.Set("myProperty", new JsNumber(3));

Console.WriteLine("Expected: 3");
engine.Execute(@"log(myObject.myProperty);");

// ----------------------------
// noExecuteCall = { myProperty: "Hello World" };
var noExecuteCall = new JsObject(engine);
noExecuteCall.Set("myProperty", new JsString("Hello World"));
engine.SetValue("noExecuteCall", noExecuteCall);
Console.WriteLine("Expected: Hello World");
engine.Execute(@"log(noExecuteCall.myProperty);");

// ----------------------------
var doesNotExist = engine.GetValue("doesNotExist");
Console.WriteLine(doesNotExist);
var casting = (JsObject)doesNotExist;

Expected: 3
3
Expected: Hello World
Hello World
undefined
Unhandled exception. System.InvalidCastException: Unable to cast object of type 'Jint.Native.JsUndefined' to type 'Jint.Native.JsObject'.