加载程序集、查找类和调用 Run() 方法的正确方法 [英] Correct Way to Load Assembly, Find Class and Call Run() Method

问题描述

示例控制台程序.

class Program
{
    static void Main(string[] args)
    {
        // ... code to build dll ... not written yet ...
        Assembly assembly = Assembly.LoadFile(@"C:dyn.dll");
        // don't know what or how to cast here
        // looking for a better way to do next 3 lines
        IRunnable r = assembly.CreateInstance("TestRunner");
        if (r == null) throw new Exception("broke");
        r.Run();

    }
}

我想动态构建一个程序集(.dll)，然后加载该程序集，实例化一个类，并调用该类的 Run() 方法.我应该尝试将 TestRunner 类转换为某些东西吗?不确定一个程序集中的类型(动态代码)如何知道我的(静态程序集/外壳应用程序)中的类型.仅使用几行反射代码在对象上调用 Run() 是否更好?这段代码应该是什么样的?

I want to dynamically build an assembly (.dll), and then load the assembly, instantiate a class, and call the Run() method of that class. Should I try casting the TestRunner class to something? Not sure how the types in one assembly (dynamic code) would know about my types in my (static assembly / shell app). Is it better to just use a few lines of reflection code to call Run() on just an object? What should that code look like?

更新:威廉埃德蒙森 - 见评论

UPDATE: William Edmondson - see comment

推荐答案

使用 AppDomain

将程序集加载到自己的更安全、更灵活AppDomain 首先.

而不是之前给出的答案:

var asm = Assembly.LoadFile(@"C:myDll.dll");
var type = asm.GetType("TestRunner");
var runnable = Activator.CreateInstance(type) as IRunnable;
if (runnable == null) throw new Exception("broke");
runnable.Run();

我建议如下(改编自 这个对相关问题的回答):

I would suggest the following (adapted from this answer to a related question):

var domain = AppDomain.CreateDomain("NewDomainName");
var t = typeof(TypeIWantToLoad);
var runnable = domain.CreateInstanceFromAndUnwrap(@"C:myDll.dll", t.Name) as IRunnable;
if (runnable == null) throw new Exception("broke");
runnable.Run();

现在您可以卸载程序集并拥有不同的安全设置.

Now you can unload the assembly and have different security settings.

如果您想为程序集的动态加载和卸载提供更大的灵活性和功能，您应该查看托管加载项框架(即 System.AddIn 命名空间).有关详细信息，请参阅有关 MSDN 上的加载项和可扩展性.

If you want even more flexibility and power for dynamic loading and unloading of assemblies, you should look at the Managed Add-ins Framework (i.e. the System.AddIn namespace). For more information, see this article on Add-ins and Extensibility on MSDN.

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