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POWhat are alternatives to generic collections for COM Interop?
 

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    <p>I am attempting to return a collection of departments from a .NET assembly to be consumed by ASP via COM Interop. Using .NET I would just return a generic collection, e.g. <code>List&lt;Department&gt;</code>, but it seems that generics don't work well with COM Interop. So, what are my options?</p> <p>I would like to both iterate over the list and be able to access an item by index. Should I inherit from <code>List&lt;Department&gt;</code>, implement an <code>IList</code>, <code>IList&lt;Department&gt;</code> or another interface, or is there a better way? Ideally I would prefer not to have to implement a custom collection for every type of list I need. Also, will <code>List[index]</code> even work with COM Interop?</p> <p>Thanks, Mike</p> <h2>Example .NET components (C#):</h2> <pre><code>public class Department { public string Code { get; private set; } public string Name { get; private set; } // ... } public class MyLibrary { public List&lt;Department&gt; GetDepartments() { // return a list of Departments from the database } } </code></pre> <h2>Example ASP code:</h2> <pre><code>&lt;% Function PrintDepartments(departments) Dim department For Each department In departments Response.Write(department.Code &amp; ": " &amp; department.Name &amp; "&lt;br /&gt;") Next End Function Dim myLibrary, departments Set myLibrary = Server.CreateObject("MyAssembly.MyLibrary") Set departments = myLibrary.GetDepartments() %&gt; &lt;h1&gt;Departments&lt;/h1&gt; &lt;% Call PrintDepartments(departments) %&gt; &lt;h1&gt;The third department&lt;/h1&gt; &lt;%= departments(2).Name %&gt; </code></pre> <h2>Related questions:</h2> <ul> <li><a href="https://stackoverflow.com/questions/161704/using-generic-lists-on-serviced-component">Using Generic lists on serviced component</a></li> <li><a href="https://stackoverflow.com/questions/56375/are-non-generic-collections-in-net-obsolete">Are non-generic collections in .NET obsolete?</a></li> </ul>
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