Can't find property or field on a dynamic object

Question

I using Dynamic Linq to do some database queries and it\'s working really well up to now. I can pass a string to a Select to select fields like so:

Answer 1

Your Cast is Defaulting to which will cause an error

(output as System.Collections.Generics.IEnumerable)

This Cast Specified the Correct Interface Try again

(output as System.Collections.IEnumerable).Cast<dynamic>().ToList()

Answer 2

If you do YourStuff.Cast<dynamic>.ToList(), you will receive IEnumerable<object>, and there is no property Foo on the type object.

The question you might be asking, how can you get IList<TheActualType>?! You can do it this way:

// for IEnumerable
public static IList ToAnonymousList(this IEnumerable enumerable)
{
    var enumerator = enumerable.GetEnumerator();
    if (!enumerator.MoveNext())
        throw new Exception("?? No elements??");

    var value = enumerator.Current;
    var returnList = (IList) typeof (List<>)
        .MakeGenericType(value.GetType())
        .GetConstructor(Type.EmptyTypes)
        .Invoke(null);

    returnList.Add(value);

    while (enumerator.MoveNext())
        returnList.Add(enumerator.Current);

    return returnList;
}

    // for IQueryable
    public static IList ToAnonymousList(this IQueryable source)
    {
        if (source == null) throw new ArgumentNullException("source");

        var returnList = (IList) typeof (List<>)
            .MakeGenericType(source.ElementType)
            .GetConstructor(Type.EmptyTypes)
            .Invoke(null);

        foreach (var elem in source)
            returnList.Add(elem);

        return returnList;
    }

It's a simple extension method that can later be used, as such:

var test = (new[]
{
    new
    {
        Property1 = "10",
        Property2 = "10",
        Property3 = 1
    }
}
.Select("New(Property1, Property2)"))
.ToAnonymousList();