How to add XmlInclude attribute dynamically

Question

I have the following classes

[XmlRoot]
public class AList
{
   public List ListOfBs {get; set;}
}

public class B
{
   public string BaseProperty {g         


        

Answer 1

Two options; the simplest (but giving odd xml) is:

XmlSerializer ser = new XmlSerializer(typeof(AList),
    new Type[] {typeof(B), typeof(C)});

With example output:

The more elegant is:

XmlAttributeOverrides aor = new XmlAttributeOverrides();
XmlAttributes listAttribs = new XmlAttributes();
listAttribs.XmlElements.Add(new XmlElementAttribute("b", typeof(B)));
listAttribs.XmlElements.Add(new XmlElementAttribute("c", typeof(C)));
aor.Add(typeof(AList), "ListOfBs", listAttribs);

XmlSerializer ser = new XmlSerializer(typeof(AList), aor);

With example output:

In either case you must cache and re-use the ser instance; otherwise you will haemorrhage memory from dynamic compilation.