Call JavaScript method with C# object as parameter

[achimmihca]

The documentation shows how to create a C# object instance from JS:

engine.SetValue("TheType", TypeReference.CreateTypeReference(engine, typeof(TheType))) // C#
var o = new TheType(); // JS

My question is, how can I pass an instance of TheType to a JS method / function?

        ObjectInstance jsObject = new Engine()
            .Execute(@"
                class MyJsClass {
                    doSomething(csObj) {
                        return csObj == null;
                    }
             }")
            .Evaluate("new MyJsClass()")
            .AsObject();

        string jsResult = jsObject.Get("doSomething")
            // Call method takes arguments as JsValue array.
            // How to convert the C# object to a JSValue[] ?
            .Call(jsObject, new TheType())
            .AsString();

[lahma]

Might be easier like this after registering the type to engine.

const result = engine.Execute("const jsObject = new MyJsClass();").Evalute("jsObject.doSomething(new TheType());");

Or

engine.SetValue("myType", new TheType());
const result = engine.Execute("const jsObject = new MyJsClass();").Evalute("jsObject.doSomething(myType));");

[achimmihca]

Thanks, engine.SetValue got me on the right track. It uses JsValue.FromObject internally.

[achimmihca]

JsValue.FromObject can be used to convert C# objects to its JS counterpart.

[achimmihca]

Sadly, in my test this does not seem to preserve the member values of the C# object.
Instead, a new instance seems to be passed to JS.

I guess what I would need is a serialization from and to JS.

[lahma]

Jint creates a wrapper around any non-JS object passed to engine and uses reflection to set values against the original instance.