C＃ - 正确的方式来加载大会，查找类并调用run（）方法 [英] C# - Correct Way to Load Assembly, Find Class and Call Run() Method

问题描述

样品控制台程序。

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();

    }
}

我要动态地构建一个集（.dll），然后加载程序集，实例化一个类，并调用这个类的run（）方法。我应该尝试铸造的TestRunner类的东西？不知道如何在一个组件（动态code）的种类会知道我种在我的（静态装配/外壳应用程序）。是更好地只使用反射code几行调用运行（）只是一个对象？我应该是code样子？

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 - 见注释

UPDATE: William Edmondson - see comment

推荐答案

这是更安全，更灵活的组件加载到自己的 AppDomain中 第一。

Use an AppDomain

It is safer and more flexible to load the assembly into its own AppDomain first.

因此​​，而不是给出答案previously ：

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();

我会建议如下（改编自这个回答一个相关的问题）

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

现在，你可以卸载的组件，有不同的安全设置。

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

。欲了解更多信息，请参见本文的外接程序和扩展性上的MSDN 。

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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