C＃接口（不同项目/程序集中的调用方法） [英] C# Interface (Call Method in Different Project/Assembly)

问题描述

以下代码几乎总结了我想要实现的目标。

The code below pretty much sums up what I want to achieve.

我们有一个包含许多不同项目的解决方案，但是我们需要能够从未引用的项目中调用项目中的方法（会导致循环引用）。

We have a solution which comprises many different projects however we have a need to be able to call methods in projects from projects which are not referenced (would cause circular reference).

我已经发布了以前的问题，下面的代码几乎就是我用接口提出的。我仍然不知道如何调用驻留在未引用的其他项目中的方法。

I have posted previous questions and the code below is pretty much what I have come up with using interfaces. I still do not know how I can call a method that resides in a different project that is not referenced.

我无法创建接口的实例，它必须是一类。但是，如何创建未引用的类的实例。我不想为此使用反射。

I cannot create an instance of the interface, it has to be a class. But how can I create an instance of a class that is not referenced. I do not want to use reflection for this.

代码是C＃2.0

感谢任何帮助。

我需要在GeneralMethod（Class Raise）中放置哪些代码才能在Listen类中执行Update方法？

What code do I need to place in "GeneralMethod" (Class Raise) to be able to execute the "Update" method in Class "Listen" ?

// Link Project
namespace Stack.Link
{
    public class Interface
    {
        public interface Update
        {
            void Update();
        }
    }
}

// Project A
// References Link only
namespace Stack.ProjA
{
    public class Raise
    {
        public void GeneralMethod()
        {
            // I want to place code in here to be able to execute 
            // "Update" method in ProjB.
            // Keep in mind that ProjA and ProjB only reference
            // Link Project            
        }
    }
}

// Project B
// References Link only
namespace Stack.ProjB
{
    public class Listen : Stack.Link.Interface.Update
    {
        public void Update()
        {
            // Do something here that is executed from ProjA
            Console.Write("Executed Method in ProjB");
        }
    }
}

我应该澄清动机需要这样做的背后。也许有更好的方法....

I should probably clarify the motivation behind needing to do this. Perhaps there is a better way ....

我们有一个基础形式，所有其他项目都是从中引用的。作为一个例子，我们将一个包含各种设置的对象传递给项目（来自基础形式）。

We have a baseform from which all other projects are referenced. As an example we pass an object which contains various settings to the project when it is loaded (from the baseform).

例如，如果设置对象有一些变量更改（在baseform中填充设置对象），我们希望加载的项目监听此更改并获取新的设置对象。

If for example, the settings object has some variables change (settings object populated in baseform), we would like the loaded project to listen for this change and obtain a new settings object.

因为baseform引用了所有其他项目，我们需要让项目监听基础形式中的事件。

Because the baseform references all the other projects, we need to have the projects "listen" for events in the baseform.

清除泥浆： - ）

推荐答案

我使用 Activator.CreateInstance 来执行此操作。您从路径加载程序集，然后创建该类的实例。例如，您可以使用此方法在主机应用程序中加载小工具程序集，主机在编译时不知道小工具。

I used Activator.CreateInstance to do this. You load the assembly from a path and then create an instance of the class. For example, you could use this to load gadgets assemblies in a host application where the host doesnt know about the gadgets at compile time.

示例伪代码（无错误处理）

Sample Pseudo Code (no error handling)

为要加载的类创建一个接口：

Create an interface for the class you are going to load:

public interface IRemote
{
     void Update();
}

然后你需要一个加载程序集并调用函数的方法

Then you need a method to load the Assembly and call the function

现在这里有一个使用这一切的方法：

Now here is a method to use all this:

private void
   DoRemoteUpdate( string assemblyPath, string className )
{ 
   Assembly assembly   = Assembly.Load(assemblyPath); 
   Type     objectType = assembly.GetType(className); 

   remoteAssembly = (IRemote)Activator.CreateInstance(objectType); 
   remoteAssembly.Update(); 
}

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