Convert boxed ienumerable into object array without knowing explicit type

Question

I've got a little code that pulls a boxed ienumerable instance out of an expression tree. The code needs to convert it into object[].

So far I've gotten away with assuming it'll be IEnumerable<string> and thus casting it followed with .ToArray().

Circumstances have changed and now it could also possibly be a IEnumerable<int>. I still need to change the box into an object[] and don't really care what the type is.

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object list = Expression.Lambda(methodCallExpression.Object).Compile().DynamicInvoke();

var enumerable = (IEnumerable<string>)list;
object[] values = enumerable.ToArray();

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UPDATE:

Strings are references and Integers are value types. I've found that while I can box the reference to an array of ints, I cannot pretend it's an array of boxed ints as int's cannot be boxed.

An exception of type 'System.InvalidCastException' occurred in System.Core.dll but was not handled in user code Additional information: Unable to cast object of type 'System.Collections.Generic.List1[System.Int32]' to type 'System.Collections.Generic.IEnumerable1[System.Object]'.

object list = Expression.Lambda(methodCallExpression.Object).Compile().DynamicInvoke(); 
var enumerable = (IEnumerable<object>)list; 
object[] values = enumerable.ToArray();

Answer 1

Just call Cast before ToArray:

object[] values = enumerable.Cast<object>().ToArray();

Note that this casts each item, not the entire collection. You can't "cast" a collection of ints to a collection of objects, you have to convert each item to an object (i.e. box them).

Answer 2

Previously answered in Best way to convert IList or IEnumerable to Array.

Or you could do it the hard way:

  IEnumerable enumberable = (IEnumerable)list;

  List<object> values = new List<object>();

  foreach (object obj in enumerable)
  {
      values.Add(obj);
  }

Answer 3

Haven't tested it, but you could theoretically cast it to IEnumerable<object> using Linq:

object [] values = ((IEnumerable)list).Cast<object>().ToArray();