XML序列化和空值 - C＃

Question

I have an object that I serialize to XML. If one of the properties in the object is null, then native serialization ignores to add this as the attribute. Is this normal behavior, if so, is there a way I can override it?

ex:

public class Test
{
  [XmlAttribute]
  public string value {set; get; }

  [XmlAttribute]
  public string key {set; get; }
}

When value is null, i get

<Root>
  <Test key="blah">
</Root>

Answer 1

XmlElement（IsNullable = true）

Answer 2

如果Sunny的答案不适合您，您可以通过实现IXmlSerializable接口来自定义序列化过程

Answer 3

For some background, take a look at the following ibm article Representations of null in XML Schema

Additionally check out the answer SO question Serialize a nullable int may be helpful in your efforts.