正确的加载程序集、查找类和调用run()方法的方法

使用AppDomain

将组件装入自己的组件更安全、更灵活。 AppDomain 第一。

因此,而不是 the answer given 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();

我建议如下(改编自 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具有不同的安全设置。

如果您想要更大的灵活性和动态加载和卸载程序集的能力,您应该查看托管外接程序框架(即 System.AddIn 命名空间)。有关更多信息,请参阅本文 Add-ins and Extensibility on MSDN .

如果您无法访问 TestRunner 在调用程序集中键入信息(听起来可能不是),可以这样调用方法:

Assembly assembly = Assembly.LoadFile(@"C:\dyn.dll");
Type     type     = assembly.GetType("TestRunner");
var      obj      = Activator.CreateInstance(type);

// Alternately you could get the MethodInfo for the TestRunner.Run method
type.InvokeMember("Run", 
                  BindingFlags.Default | BindingFlags.InvokeMethod, 
                  null,
                  obj,
                  null);

如果您可以访问 IRunnable 接口类型,可以将实例强制转换为该类型(而不是 特斯特朗 类型,在动态创建或加载的程序集中实现,对吗?):

  Assembly assembly  = Assembly.LoadFile(@"C:\dyn.dll");
  Type     type      = assembly.GetType("TestRunner");
  IRunnable runnable = Activator.CreateInstance(type) as IRunnable;
  if (runnable == null) throw new Exception("broke");
  runnable.Run();

我做的正是你在我的规则引擎中寻找的,它使用 CS-Script 用于动态编译、加载和运行C。它应该可以很容易地翻译成您正在寻找的内容,我将给出一个示例。首先,代码(删去部分):

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using CSScriptLibrary;

namespace RulesEngine
{
    /// <summary>
    /// Make sure <typeparamref name="T"/> is an interface, not just any type of class.
    /// 
    /// Should be enforced by the compiler, but just in case it's not, here's your warning.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class RulesEngine<T> where T : class
    {
        public RulesEngine(string rulesScriptFileName, string classToInstantiate)
            : this()
        {
            if (rulesScriptFileName == null) throw new ArgumentNullException("rulesScriptFileName");
            if (classToInstantiate == null) throw new ArgumentNullException("classToInstantiate");

            if (!File.Exists(rulesScriptFileName))
            {
                throw new FileNotFoundException("Unable to find rules script", rulesScriptFileName);
            }

            RulesScriptFileName = rulesScriptFileName;
            ClassToInstantiate = classToInstantiate;

            LoadRules();
        }

        public T @Interface;

        public string RulesScriptFileName { get; private set; }
        public string ClassToInstantiate { get; private set; }
        public DateTime RulesLastModified { get; private set; }

        private RulesEngine()
        {
            @Interface = null;
        }

        private void LoadRules()
        {
            if (!File.Exists(RulesScriptFileName))
            {
                throw new FileNotFoundException("Unable to find rules script", RulesScriptFileName);
            }

            FileInfo file = new FileInfo(RulesScriptFileName);

            DateTime lastModified = file.LastWriteTime;

            if (lastModified == RulesLastModified)
            {
                // No need to load the same rules twice.
                return;
            }

            string rulesScript = File.ReadAllText(RulesScriptFileName);

            Assembly compiledAssembly = CSScript.LoadCode(rulesScript, null, true);

            @Interface = compiledAssembly.CreateInstance(ClassToInstantiate).AlignToInterface<T>();

            RulesLastModified = lastModified;
        }
    }
}

这将采用T类型的接口,将.cs文件编译为程序集,实例化给定类型的类,并将实例化的类与T接口对齐。基本上,您只需确保实例化的类实现了该接口。我使用属性设置和访问所有内容,如:

private RulesEngine<IRulesEngine> rulesEngine;

public RulesEngine<IRulesEngine> RulesEngine
{
    get
    {
        if (null == rulesEngine)
        {
            string rulesPath = Path.Combine(Application.StartupPath, "Rules.cs");

            rulesEngine = new RulesEngine<IRulesEngine>(rulesPath, typeof(Rules).FullName);
        }

        return rulesEngine;
    }
}

public IRulesEngine RulesEngineInterface
{
    get { return RulesEngine.Interface; }
}

对于您的示例,您希望调用run(),因此我将创建一个定义run()方法的接口,如下所示:

public interface ITestRunner
{
    void Run();
}

然后生成一个实现它的类,如下所示:

public class TestRunner : ITestRunner
{
    public void Run()
    {
        // implementation goes here
    }
}

将rulesEngine的名称更改为类似testharness的名称,并设置属性:

private TestHarness<ITestRunner> testHarness;

public TestHarness<ITestRunner> TestHarness
{
    get
    {
        if (null == testHarness)
        {
            string sourcePath = Path.Combine(Application.StartupPath, "TestRunner.cs");

            testHarness = new TestHarness<ITestRunner>(sourcePath , typeof(TestRunner).FullName);
        }

        return testHarness;
    }
}

public ITestRunner TestHarnessInterface
{
    get { return TestHarness.Interface; }
}

然后,您可以在任何地方调用它,只需运行:

ITestRunner testRunner = TestHarnessInterface;

if (null != testRunner)
{
    testRunner.Run();
}

它可能对插件系统很有用,但我的代码仅限于加载和运行一个文件,因为我们的所有规则都在一个C源文件中。不过,我认为修改它非常容易,只需为您想要运行的每个文件传入类型/源文件即可。您只需要将代码从getter移到一个接受这两个参数的方法中。

同时,用你的易怒来代替Itesturner。

您将需要使用反射来获取类型“testranner”。使用assembly.getType方法。

class Program
{
    static void Main(string[] args)
    {
        Assembly assembly = Assembly.LoadFile(@"C:\dyn.dll");
        Type type = assembly.GetType("TestRunner");
        var obj = (TestRunner)Activator.CreateInstance(type);
        obj.Run();
    }
}

构建程序集时,可以调用 AssemblyBuilder.SetEntryPoint ,然后从 Assembly.EntryPoint 属性来调用它。

请记住,您需要使用这个签名,并注意它不必命名。 Main :

static void Run(string[] args)