StackOverflow2013

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POCan I access my c# objects from my external .dll? Maybe using ROT
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copied!<p>I have a c# application that runs locally, and I have a .dll written in c#.</p> <p>MyApplication contains</p> <pre><code>namespace MyApplication { public interface IMyInterface { IMyInterface Instance { get; } int MyProp { get; } } class MyClass : IMyInterface { public int MyProp { get; private set; } private MyClass instance public static IMyInterface { get { if (instance == null) { instance = new MyClass(); } return instance; } } private MyClass() { MyProp = 1; } } } </code></pre> <p>MyLibrary:</p> <pre><code>namespace MyLibrary { public LibClass { public static int GetProp() { //I want to get the running instance of MyApplication //If MyApplication is not running I want to start a new instance //From my application instance I want to //return the value from MyInterface.Instance.MyProp } } } </code></pre> <p>Some googling has me looking at a COM server of sorts, but it wasn't clear if that was the best approach. I am having trouble even knowing what to google for this one. Ultimately <code>MyInterface</code> Will get a lot more complex and will include events to notify <code>MyLibrary</code> to refresh the data. How is the best way to accomplish this? Is it a COM server? Do I want to create some sort of API in <code>MyApplication</code> that <code>MyLibrary</code> uses?</p> <p><em>Additional Information:</em></p> <p>My .dll is being created as a real time data server for excel. I want to be able to access the data within my application from excel and notify excel of refreshes. I don't want to have multiple instances of my application since user input will determine the values displayed in excel. I am able to create the rtd server, however I am not sure what the best way is to access my outside data.</p> <p><strong>EDIT:</strong></p> <p>After doing some more research I think I am interested in using <code>GetActiveObject("MyApplication.IMyInterface")</code> inside <code>MyLibrary</code> to look like</p> <pre><code>namespace MyLibrary { public LibClass { public static int GetProp() { running_obj = System.Runtime.InteropServices.Marshal.GetActiveObject("MyApplication.IMyInterface") return ((IMyInterface) running_obj).MyProp; } private object running_obj = null; } } </code></pre> <p>But I am not sure how to register <code>MyApplication.MyClass</code> in the ROT. The code as is throws an exception</p> <pre><code>Invalid class string (Exception from HRESULT: 0x800401F3 (CO_E_CLASSSTRING)) </code></pre>

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