Pass object instance to Roslyn ScriptEngine
.net, c#, roslyn
Solution
The answer was found in a link commented by @Herman.
As it turn out, Roslyn `ScriptEngine/Session` supports a concept of `Host Object`. In order to use it, define a class of your choise, and pass it upon session creation. Doing so, makes all public member of that host object, available to context inside the session:
public class MyHostObject
{
public List<int> list_of_ints;
public int an_int = 23;
}
var hostObject = new MyHostObject();
hostObject.list_of_ints = new List<int>();
hostObject.list_of_ints.Add(2);
var engine = new ScriptEngine(new[] { hostObject.GetType().Assembly.Location });
// passing reference to hostObject upon session creation
var session = Session.Create(hostObject);
// prints `24` to console
engine.Execute(@"System.Console.WriteLine(an_int + list_of_ints.Count);",
session);
Problem
I'm looking for a C# scripting engine, that can interpret blocks of C# code, while maintaing a context. For example, if enter to it: `var a = 1;` , and then `a + 3`, it'll output `4`. I'm aware of MS `Roslyn` , which indeed do that, but it's a sandbox (respect to the program that launched it). So, if I create an instance of `ScriptEngine` and an instance of `MyClass` (just an arbirary class of mine) , I have no option to pass a reference of `my_class` to `script_engine`. Is it possible to somehow pass that reference? What I'd like to do, is something like: ``` ScriptEngine engine; // A Roslyn object Session session // A Roslyn object MyClass my_class; // My object // all required initializations Submission<object> sm = session.CompileSubmission<object>("var a=1;"); dynamic result = sm.Execute(); Submission<object> sm = session.CompileSubmission<object>("a + 3;"); dynamic result = sm.Execute(); // result is now 4 MyClass my_class; session.AddReferenceToAnOject(my_class); // function that does not exists, but reflect my intention Submission<object> sm = session.CompileSubmission<object>("my_class.ToString();"); dynamic result = sm.Execute(); // result is no the output of my_class.ToString() ``` Please notice that `AddReferenceToAnOject()` is the missing part, as there's no such function in roslyn.