Question

Ok so at first I thought this was easy enough, and maybe it is and I’m just too tired – but here’s what I’m trying to do. Say I have the following objects:

public class Container
{
     public string Name { get; set; }
     public List<Address> Addresses { get; set; }
}
public class Address
{
     public string AddressLine1 { get; set; }
     public string AddressLine2 { get; set; }
     public List<Telephone> Telephones { get; set; }
}
public class Telephone
{
     public string CellPhone { get; set; }
}

What I need to be able to do, is ‘flatten’ Containers property names in to a string (including ALL child properties AND child properties of child properties) that would look something like this:

Container.Name, Container.Addresses.AddressLine1, Container.Addresses.AddressLine2, Container.Addresses.Telephones.CellPhone

Does that make any sense? I can’t seem to wrap it around my head.

Answer 1

I suggest you to mark all the classes, you need to grab, with custom attribute after that you could do something like this

 class Program
{
    static void Main(string[] args)
    {
        var lines = ExtractHelper.IterateProps(typeof(Container)).ToArray();

        foreach (var line in lines)
            Console.WriteLine(line);

        Console.ReadLine();
    }
}

static class ExtractHelper
{

    public static IEnumerable<string> IterateProps(Type baseType)
    {
        return IteratePropsInner(baseType, baseType.Name);
    }

    private static IEnumerable<string> IteratePropsInner(Type baseType, string baseName)
    {
        var props = baseType.GetProperties();

        foreach (var property in props)
        {
            var name = property.Name;
            var type = ListArgumentOrSelf(property.PropertyType);
            if (IsMarked(type))
                foreach (var info in IteratePropsInner(type, name))
                    yield return string.Format("{0}.{1}", baseName, info);
            else
                yield return string.Format("{0}.{1}", baseName, property.Name);
        }
    }

    static bool IsMarked(Type type)
    {
        return type.GetCustomAttributes(typeof(ExtractNameAttribute), true).Any();
    }


    public static Type ListArgumentOrSelf(Type type)
    {
        if (!type.IsGenericType)
            return type;
        if (type.GetGenericTypeDefinition() != typeof(List<>))
            throw new Exception("Only List<T> are allowed");
        return type.GetGenericArguments()[0];
    }
}

[ExtractName]
public class Container
{
    public string Name { get; set; }
    public List<Address> Addresses { get; set; }
}

[ExtractName]
public class Address
{
    public string AddressLine1 { get; set; }
    public string AddressLine2 { get; set; }
    public List<Telephone> Telephones { get; set; }
}

[ExtractName]
public class Telephone
{
    public string CellPhone { get; set; }
}

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, Inherited = true, AllowMultiple = true)]
public sealed class ExtractNameAttribute : Attribute
{ }