Using linq to combine objects

Question

I have 2 instances of a class that implements the IEnumerable interface. I would like to create a new object and combine both of them into one. I understand I can use the for..each to do this.

Is there a linq/lambda expression way of doing this?

EDIT

public class Messages : IEnumerable, IEnumerable<Message>
{
  private List<Message> message = new List<Message>();

  //Other methods
}

Code to combine

MessagesCombined messagesCombined = new MessagesCombined();

MessagesFirst messagesFirst = GetMessageFirst();
MessagesSecond messagesSecond = GetMessageSecond();

messagesCombined = (Messages)messagesFirst.Concat(messagesSecond); //Throws runtime exception

//Exception is

Unable to cast object of type '<ConcatIterator>d__71`1[Blah.Message]' to type 'Blah.Messages'.

Answer 1

I had the same problem with an array of byte. What I did to solve my issue:

col1.Concat(col2).ToArray();

If you got a list:

col1.Concat(col2).ToList();

Answer 2

Try something like this:

var combined = firstSequence.Concat(secondSequence);

This is using the Enumerable.Concat extension method.