Why isn’t my public property serialized by the XmlSerializer?

As mentioned, most properties must have both a getter and setter; the main exception to this is lists – for example:

private readonly List<Foo> bar = new List<Foo>();
public List<Foo> Bar {get { return bar; } } // works fine

which will work fine; however, if XmlSerializer finds a setter – it demands that it is public; the following will not work:

public List<Foo> Bar {get; private set;} // FAIL

Other reasons it might not serialize:

  • it isn’t public with get and set (or is readonly for a field)
  • it has a [DefaultValue] attribute, and is with that value
  • it has a public bool ShouldSerializeFoo() method that returned false
  • it has a public bool FooSpecified {get;set;} property or field that returned false
  • it is marked [XmlIgnore]
  • it is marked [Obsolete]

Any of these will cause it not to serialize

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