一个函数功能＆LT;＆GT;与罗斯林 [英] Create a Func<> with Roslyn

问题描述

灵感<一href="http://weblogs.asp.net/lichen/archive/2013/10/08/delegate-performance-of-roslyn-sept-2012-ctp-is-im$p$pssive.aspx"相对=nofollow>这个和这文章，我试图创造一个充满活力的功能与罗斯林。

Inspired by this and this article, I'm trying to create a dynamic function with Roslyn.

然而，提到来源是过时的或不完整的，我不能够创造出功能性样本。我的工作至今：

However the mentioned sources are outdated or not complete and I'm not able to create a functional sample. My work so far:

var code = @"Func<int, int> doStuffToInt = i =>
{
   var result = i;
   for (var y = i; y <= i * 2; y++)
   {
      result += y;
   }
   return result;
};";


var se = new ScriptEngine();
var session = se.CreateSession();
session.AddReference(typeof(Program).Assembly);
session.AddReference(typeof(Expression).Assembly);

session.ImportNamespace("System");
session.ImportNamespace("System.Linq");
session.ImportNamespace("System.Linq.Expressions");

var submission = session.CompileSubmission<Func<int, int>>(code);

Func<int, int> myFunc =  submission.Execute();

然而 myFunc的总是空，我不能够确定问题所在。有人可以帮助我，使这个样品运行？

However myFunc is always null and I'm not able to identify where the problem is. Can someone help me out to make this sample run?

推荐答案

免责声明：我还没有实际使用罗斯林在愤怒太大的所有

Disclaimer: I haven't actually used Roslyn in anger much at all.

目前的code声明一个变量，但没有用它做任何事情之后。根据<一href="http://blog.filipekberg.se/2011/12/08/hosted-execution-of-smaller-$c$c-snippets-with-roslyn/">this随机博客帖子，它看起来像你可能只需要一个额外的前pression宣布后：

Currently your code declares a variable, but doesn't do anything with it afterwards. Based on this random blog post, it looks like you possibly just need an extra expression after the declaration:

var code = @"Func<int, int> doStuffToInt = i =>
{
   var result = i;
   for (var y = i; y <= i * 2; y++)
   {
      result += y;
   }
   return result;
};
doStuffToInt"; // This is effectively the return statement for the script...

我不保证它会工作，但不妨一试：）

I don't guarantee it'll work, but give it a try :)

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