Callback from JavaScript to C#

[CzaiStefanB]

Hello,

is it possible to insert a callback function from JavaScript code to C# code as parameter? I tried it like that:

C#: public void CSharpMethodWhichShouldReceiveJavaScriptCallback(object javaScriptCallbackWithParameter) { MyCSharpClass parameterForCallback = new MyCSharpClass(); dynamic callback = javaScriptCallbackWithParameter; callback(parameterForCallback); }

JavaScriptEngine.EmbedHostObject("CSharpMethodWhichShouldReceiveJavaScriptCallback", delegateToMethod);

JavaScript: function callbackFunctionWhichShouldBeCalledFromCSharp(parameter) { // do something with parameter which should be of type MyCSharpClass }

CSharpMethodWhichShouldReceiveJavaScriptCallback(callbackFunctionWhichShouldBeCalledFromCSharp);

The problem is, that the "javaScriptCallbackWithParameter" in the C# method is of type JsValue (ValueType is Function) and I don't know how to call the function then. Perhaps you can give me a hint how to solve this.

Thanks and best regards, Stefan

[Taritsyn]

Hello, Stefan!

You can use the Execute or Evaluate method of JS engine with JSON serialization:

string serializedParameterForCallback = JsonConvert.SerializeObject(parameterForCallback);
jsEngine.Execute("callbackFunctionWhichShouldBeCalledFromCSharp(" + serializedParameterForCallback + ");");

[CzaiStefanB]

Hello Andrey,

thanks for the tip with the serialization. Unfortunately, this probably doesn't work for me because the parameter is a complex C# type that can't be serialized to string. I have now solved the problem by implementing the C# method entirely in JavaScript and making it known in the JS engine. From my side, this would solve the case for now.

Thanks and best regards, Stefan