Matjaž Mav Matjaž Mav - 27 days ago 18
C# Question

Roslyn scripting with enforced script interface

I have simple

IScript
interface. And I want enforce that all scripts implement it.

public interface IScript<T>
{
T Execute(object[] args);
}


I want to use Roslyn scripting API to achive this. Something like this is possible with CSScript (see Interface Alignment).

var code = @"
using System;
using My.Namespace.With.IScript;

public class Script : IScript<string>
{
public string Execute()
{
return ""Hello from script!"";
}
}
";

var script = CSharpScript.Create(code, ScriptOptions.Default); // + Load all assemblies and references
script.WithInterface(typeof(IScript<string>)); // I need something like this, to enforce interface
script.Compile();

string result = script.Execute(); // and then execute script

Console.WriteLine(result); // print "Hello from script!"

Answer

Type safety is a static thing enforced a compile time (of your application). Creating and running a CSharpScript is done at runtime. So you cannot enforce type safety at runtime.

Maybe CSharpScript is not the right way to go. By using this SO answer, You can compile a piece of C# code into memory and generate assembly bytes with Roslyn.

You would then change the line

object obj = Activator.CreateInstance(type);

to

IScript<string> obj = Activator.CreateInstance(type) as IScript<string>;
if (obj != null) {
    obj.Execute(args);
}
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