Question

我正在寻找一个C＃脚本引擎，可以在维护上下文的同时解释C＃代码块。例如，如果输入：var a = 1;，然后a + 3，则输出4。我知道MS Roslyn，确实这样做，但它是一个沙盒（相对于启动它的程序）。所以，如果我创建ScriptEngine的实例和MyClass的实例（只是我的一个arbirary类），我没有选择将my_class的引用传递给{{1} }。

是否有可能以某种方式传递该引用？

我想要做什么，就像：

script_engine

请注意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()是缺失的部分，因为在roslyn中没有这样的功能。

Answer 1

在@Herman评论的link中找到答案。

事实证明，Roslyn ScriptEngine/Session支持Host Object的概念。为了使用它，定义一个选择的类，并在创建会话时传递它。这样做，使该主机对象的所有 public 成员可用于会话内的上下文：

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);

Answer 2

这是一个如何将变量从object传递给roslyn动态执行代码的完整过程。包含的还有eval（）包装器。首先从microsoft.com http://www.microsoft.com/en-sa/download/details.aspx?id=34685

安装RoslynSetup.exe

然后将参考Roslyn.Compilers和Roslyn.Compilers.CSharp添加到您的项目（程序集/扩展）

这是vs2012中C＃console app的完整工作代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Roslyn.Compilers;
using Roslyn.Compilers.CSharp;
using Roslyn.Scripting;
using Roslyn.Scripting.CSharp;

namespace testRoslyn
{
    class Program
    {
        static void Main(string[] args)
        {
            TestRoslyn tr = new TestRoslyn();
            tr.Test = "this was set from main program ";
            tr.test();
            System.Console.WriteLine(tr.Test);
            tr.Test = "this was set from main program for eval";
            Eval e = new Eval();
            e.create<TestRoslyn>(tr);                           
            e.eval("Test = Test + \" AND THIS WAS SET FROM Eval()\";");
            System.Console.WriteLine(tr.Test);
            string a = e.eval<string>("string a = \"return this from eval\";a");
            System.Console.WriteLine(a);
            tr.Test = "now return this";
            string b = e.eval<string>("string a = Test + \" ... and this\";a");
            System.Console.WriteLine(b);
            double d = e.eval<double>("double dbl = 1.2345*3;dbl");
            System.Console.WriteLine(d);
            e.eval("string testIt(string a){return \"testIt(): \"+a+\"\";}");
            string c = e.eval<string>("string c = testIt(\"nice\");c");
            System.Console.WriteLine(c);
            Console.ReadKey();
        }
    }

    public class TestRoslyn
    {
        public string Test;

        public TestRoslyn()
        {
        }

        public string test()
        {
            ScriptEngine roslynEngine = new ScriptEngine();
            Roslyn.Scripting.Session session = roslynEngine.CreateSession(this);
            session.AddReference(this.GetType().Assembly);
            session.AddReference("System.Web");
            session.ImportNamespace("System");
            session.ImportNamespace("System.Web");
            var result = (string)session.Execute("Test = Test + \" ... and this was set from roslyn code.\";Test");
            return result;
        }
    }

    public class Eval
    {
        ScriptEngine RoslynEngine = new ScriptEngine();
        Roslyn.Scripting.Session Session;

        public void create<T>(T hostObject = null) where T : class
        {
            RoslynEngine = new ScriptEngine();
            Session = RoslynEngine.CreateSession(hostObject);
            if (hostObject != null)
                Session.AddReference(hostObject.GetType().Assembly);
            Session.AddReference("System.Web");
            Session.ImportNamespace("System");
            Session.ImportNamespace("System.Web");
        }

        public void eval (string strEval)
        {                                                
            Session.Execute(strEval);
        }

        public T eval<T>(string strEval) 
        {
            return (T) Session.Execute(strEval);            
        }
    }
}

将对象实例传递给Roslyn ScriptEngine

2 个答案: