使用xsi：nil =“ true” C＃序列化删除xml元素

Question

我有一个XML，它具有一些值，有时可能会有null值，如下所示：我不希望XML中完全列出具有null的节点！元素在类中设置为IsNullable = true。我在Google尝试了很多东西的任何建议。没有任何帮助！

<?xml version="1.0" encoding="utf-8"?>
<Materials>
  <Material>
    <MaterialName>ABC</MaterialName>
    <Weight Value="0.303">
      <Weight_A xsi:nil="true" />
      <Weight_B xsi:nil="true" />
    </Weight>
    <Density Value="800">
      <Density_A xsi:nil="true" />
      <Density_B xsi:nil="true" />
    </Density>
    <Volume Value="8771.427" />
  </Material>
  <Material>
    <MaterialName>ABC</MaterialName>
    <Weight>
      <V5_Weight>2.009</V5_Weight>
      <V6_Weight>1.3318154561904</V6_Weight>
    </Weight>
    <Density>
      <V5_density>1000</V5_density>
      <V6_density>663</V6_density>
    </Density>
    <Volume Value="2008771.427" />
  </Material>
</Materials>

类结构如下：

[XmlRoot(ElementName = "Weight")]
public class Weight
{
    [XmlElement(ElementName = "Weight_A", IsNullable = true)]
    public string Weight_A { get; set; }

    [XmlElement(ElementName = "Weight_B", IsNullable = true)]
    public string Weight_B { get; set; }

    [XmlAttribute(AttributeName = "Value")]
    public string Value { get; set; }

}

[XmlRoot(ElementName = "Density")]
public class Density
{
    [XmlElement(ElementName = "Density_A", IsNullable = true)]
    public string Density_A { get; set; }
    [XmlElement(ElementName = "Density_B", IsNullable = true)]
    public string Density_B { get; set; }

    [XmlAttribute(AttributeName = "Value")]
    public string Value { get; set; }
}

[XmlRoot(ElementName = "Volume")]
public class Volume
{
    [XmlElement(ElementName = "Volume_A")]
    public string Volume_A { get; set; }
    [XmlElement(ElementName = "Volume_B")]
    public string Volume_B { get; set; }

    [XmlAttribute(AttributeName = "Value")]
    public string Value { get; set; }
}

[XmlRoot(ElementName = "Material")]
public class Material
{
    [XmlElement(ElementName = "MaterialName")]
    public string MaterialName { get; set; }
    [XmlElement(ElementName = "Weight")]
    public Weight Weight { get; set; }

    [XmlElement(ElementName = "Density")]
    public Density Density { get; set; }
    [XmlElement(ElementName = "Volume")]
    public Volume Volume { get; set; }
}

[XmlRoot(ElementName = "Materials")]
public class Materials
{
    [XmlElement(ElementName = "Material")]
    public List<Material> Material { get; set; }
}