在Mono.Csharp中运行一个迷你程序

Question

我正在尝试编写一个交互式C#教学应用程序,用户可以在其中试验/更改代码示例,看看会发生什么(有点像jsfiddle).

我发现很多小型表达式或类似REPL的Mono.Csharp用作运行时编译器的例子,但是我找不到一个执行"迷你程序"的例子.

这是我到目前为止的玩具代码(MVC动作)."code"参数直接从textarea发布.

[HttpPost]
public ActionResult Index(string code)
{
    var reportWriter = new StringWriter();
    var settings = new CompilerSettings();
    var printer = new ConsoleReportPrinter(reportWriter);
    var reports = new Report(printer);
    var eval = new Evaluator(settings, reports);

    var model = new CodeViewModel();
    model.Code = code;
    eval.Run(code);
    model.Result = reportWriter.ToString();

    return View("Index", model);
}

现在假设代码是这样的字符串:

using System;
public class MyClass
{
    public void DoSomething()
    {
        Console.WriteLine("hello from DoSomething!");
    }
}

我如何引导它(即实例化一个MyClass对象并调用DoSomething它)？我已经尝试过追加new MyClass().DoSomething();到最后,但我明白了:

{interactive}(1,2): warning CS0105: The using directive for `System' appeared previously in this namespace
{interactive}(1,8): (Location of the symbol related to previous warning)
{interactive}(11,1): error CS1530: Keyword `new' is not allowed on namespace elements
{interactive}(11,4): error CS1525: Unexpected symbol `MyClass', expecting `class', `delegate', `enum', `interface', `partial', or `struct'

我错过了什么？

Answer 1

var reportWriter = new StringWriter();
var settings = new CompilerSettings();
var printer = new ConsoleReportPrinter(reportWriter);
var reports = new Report(printer);
var eval = new Evaluator(settings, reports);

eval.Run(code);

eval.Run(@"
    var output = new System.IO.StringWriter(); 
    Console.SetOut(output);
    new MyClass().DoSomething();");

var model = new CodeViewModel();
model.Code = code;

if (reports.Errors > 0)
   model.Result = reportWriter.ToString();
else
   model.Result = (string) eval.Evaluate("output.ToString();");

return View("Index", model);