Is there an easy way to merge C# anonymous objects

Question

Let\'s say I have two anonymous objects like this:

var objA = new { test = \"test\", blah = \"blah\" };
var objB = new { foo = \"foo\", bar = \"bar\" };
         


        

Answer 1

If you truly do mean dynamic in the C# 4.0 sense, then you can do something like:

static dynamic Combine(dynamic item1, dynamic item2)
{
    var dictionary1 = (IDictionary)item1;
    var dictionary2 = (IDictionary)item2;
    var result = new ExpandoObject();
    var d = result as IDictionary; //work with the Expando as a Dictionary

    foreach (var pair in dictionary1.Concat(dictionary2))
    {
        d[pair.Key] = pair.Value;
    }

    return result;
}

You could even write a version using reflection which takes two objects (not dynamic) and returns a dynamic.