Using extension methods with runtime assemblies

Question

Is there any way to use extension methods on a class that has been dynamically created using Relection.Emit? For example:

 class somewhere
 {
     somewhere()
     {
         // define the type here using ReflectionEmit, etc.
         Type tableType = CreateTableType(...table parameters...);

         var table = Activator.CreateInstance(tableType);
         table.Shuffle();
     } 
 }

 //... elsewhere
 public class static TableTypeExtensions   
 {
      public static Table Shuffle( this Table t)  
      {   
          ...
      }
 }

But I don't have the class by name "Table", only Type tableType available.
Is there any way around this?
Thanks

Answer 1

Make the dynamic class implement an interface (an empty one if you want), add extensions to the interface.

Answer 2

Define a common base class for your TableType and define the extension method on that. This way your extension method should be available for the derived classes as well.

Answer 3

Let's look at what you're asking.

You're asking how to get the extension method to operate on your object instance.

Obviously, for this to work, it has to be a Table, otherwise your question makes no sense.

So just cast it to Table:

var table = (Table)Activator.CreateInstance(tableType);

and you can call your extension method just fine.

Answer 4

In your somewhere code do you have reference to the type Table? If so you can:

 Type tableType = CreateTableType(...table parameters...);

 var table = Activator.CreateInstance(tableType) as Table;
 table.Shuffle();