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copied!<p>You need to decouple the two DLLs, placing the interfaces and implementation in two different DLLs, and then using late binding to instantiate the class.</p> <hr> <pre><code>// IFoo.cs: (build IFoo.dll) interface IFoo { void foo(int i); } public class FooFactory { public static IFoo CreateInstance() { return (IFoo)Activator.CreateInstance("Foo", "foo").Unwrap(); } } </code></pre> <hr> <pre><code>// IBar.cs: (build IBar.dll) interface IBar { void bar(int i); } public class BarFactory { public static IBar CreateInstance() { return (IBar)Activator.CreateInstance("Bar", "bar").Unwrap(); } } </code></pre> <hr> <pre><code>// foo.cs: (build Foo.dll, references IFoo.dll and IBar.dll) public class Foo : IFoo { void foo(int i) { IBar objBar = BarFactory.CreateInstance(); if (i > 0) objBar.bar(i -i); } } </code></pre> <hr> <pre><code>// bar.cs: (build Bar.dll, references IBar.dll and IFoo.dll) public class Bar : IBar { void bar(int i) { IFoo objFoo = FooFactory.CreateInstance(); if (i > 0) objFoo.foo(i -i); } } </code></pre> <p>The "Factory" classes are technically not necessary, but it's much nicer to say:</p> <pre><code>IFoo objFoo = FooFactory.CreateInstance(); </code></pre> <p>in application code than:</p> <pre><code>IFoo objFoo = (IFoo)Activator.CreateInstance("Foo", "foo").Unwrap(); </code></pre> <p>because of the following reasons:</p> <ol> <li>You can avoid a "cast" in application code, which is a good thing</li> <li>If the DLL that hosts the class changes, you don't have to change all the clients, just the factory.</li> <li>Code-completion still wroks.</li> <li>Depending on your needs, you have to call culture-aware or key-signed DLLs, in which case you can add more parameters to the CreateInstance call in the factory in one place.</li> </ol> <p>-- Kenneth Kasajian</p>

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