如何动态评估 C# 代码? [英] How can I evaluate C# code dynamically?

问题描述

我可以使用 eval("something()"); 在 JavaScript 中动态执行代码.有没有办法让我在 C# 中做同样的事情?

I can do an eval("something()"); to execute the code dynamically in JavaScript. Is there a way for me to do the same thing in C#?

我想要做的一个例子是:我有一个整数变量(比如 i)，我有多个属性，名称分别为:Property1"、Property2"、Property3"， 等等.现在，我想根据 i 的值对"Propertyi "属性执行一些操作.

An example of what I am trying to do is: I have an integer variable (say i) and I have multiple properties by the names: "Property1", "Property2", "Property3", etc. Now, I want to perform some operations on the " Propertyi " property depending on the value of i.

使用 Javascript 这真的很简单.有没有办法用 C# 做到这一点?

This is really simple with Javascript. Is there any way to do this with C#?

推荐答案

免责声明:这个答案是在 2008 年写的.从那时起，情况发生了巨大的变化.

DISCLAIMER: This answer was written back in 2008. The landscape has changed drastically since then.

查看此页面上的其他答案，尤其是详细介绍 Microsoft.CodeAnalysis.CSharp.Scripting 的答案.

Look at the other answers on this page, especially the one detailing Microsoft.CodeAnalysis.CSharp.Scripting.

其余的答案将保持原样，但不再准确.

Rest of answer will be left as it was originally posted but is no longer accurate.

不幸的是，C# 不是那样的动态语言.

Unfortunately, C# isn't a dynamic language like that.

但是，您可以做的是创建一个包含类和所有内容的 C# 源代码文件，然后通过 C# 的 CodeDom 提供程序运行它并将其编译为程序集，然后执行它.

What you can do, however, is to create a C# source code file, full with class and everything, and run it through the CodeDom provider for C# and compile it into an assembly, and then execute it.

MSDN 上的这个论坛帖子包含一个答案，在页面下方有一些示例代码:
从字符串创建匿名方法?

This forum post on MSDN contains an answer with some example code down the page somewhat:
create a anonymous method from a string?

我很难说这是一个非常好的解决方案，但无论如何它是可能的.

I would hardly say this is a very good solution, but it is possible anyway.

您希望在该字符串中包含什么样的代码?如果它是有效代码的次要子集，例如只是数学表达式，则可能存在其他替代方案.

What kind of code are you going to expect in that string? If it is a minor subset of valid code, for instance just math expressions, it might be that other alternatives exists.

编辑:嗯，这教会了我首先要彻底阅读问题.是的，在这里反思可以给你一些帮助.

Edit: Well, that teaches me to read the questions thoroughly first. Yes, reflection would be able to give you some help here.

如果你用 ; 分割字符串首先，要获取单个属性，您可以使用以下代码为类的特定属性获取 PropertyInfo 对象，然后使用该对象来操作特定对象.

If you split the string by the ; first, to get individual properties, you can use the following code to get a PropertyInfo object for a particular property for a class, and then use that object to manipulate a particular object.

String propName = "Text";
PropertyInfo pi = someObject.GetType().GetProperty(propName);
pi.SetValue(someObject, "New Value", new Object[0]);

链接:PropertyInfo.SetValue 方法

这篇关于如何动态评估 C# 代码?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！