XML序列化集合不出现在XML中

我试图序列化一个继承这个网站上看到的接口集合的类，但是，它没有出现在我的XML上。会出什么问题呢?为什么我的XMLSerializer不包括AssertionAttribute Collection?至于我的例子，我提前为附上的大量代码道歉。

为这个元素生成的XML:

    <saml:AttributeStatement xmlns:xs="http://www.w3.org/2001/XMLSchema" />

XML期望从我的例子中产生:

<saml:AttributeStatement xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <saml:Attribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" Name="Language">
    <saml:AttributeValue xsi:type="xs:string" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">en-US</saml:AttributeValue>
  </saml:Attribute>
  <saml:Attribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" Name="fromApp">
    <saml:AttributeValue xsi:type="xs:string" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SP2</saml:AttributeValue>
  </saml:Attribute>
  <saml:Attribute NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" Name="Action">
    <saml:AttributeValue xsi:type="xs:string" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">VSREPORT</saml:AttributeValue>
  </saml:Attribute>
</saml:AttributeStatement>

代码:

AttributeStatement.cs

[Serializable]
[XmlType(Namespace="http://www.w3.org/2001/XMLSchema")]
public class AttributeStatement
{
    private static AssertionAttributes attributes = new AssertionAttributes();
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces();
    [XmlAttribute(AttributeName = "Attribute")]
    public static AssertionAttributes attribute;
    public AttributeStatement()
    {
        xmlns.Add("xs", "http://www.w3.org/2001/XMLSchema");
        SetAttributes();
    }
    private static void SetAttributes()
    {
        var languageAttribute = new AssertionAttribute("en-US");
        languageAttribute.Name = "Name";
        attributes.Add(languageAttribute);
        var fromAppAttribute = new AssertionAttribute("SP2");
        fromAppAttribute.Name = "fromApp";
        attributes.Add(fromAppAttribute);
        var actionAttribute = new AssertionAttribute("VSREPORT");
        actionAttribute.Name = "Action";
        attributes.Add(actionAttribute);
        attribute = attributes;
    }
}

AssertionAttributes.cs -类应该包含类型AssertionAttribute

的集合

[Serializable]
[XmlType(Namespace = "urn:oasis:names:tc:SAML:2.0:assertion")]
public class AssertionAttributes : ICollection
{
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces();
    public AssertionAttributes()
    {
        xmlns.Add("saml", "urn:oasis:names:tc:SAML:2.0:assertion");
    }
    private ArrayList empArray = new ArrayList();
    public AssertionAttribute this[int index]
    {
        get { return (AssertionAttribute)empArray[index]; }
    }
    void ICollection.CopyTo(Array array, int index)
    {
        empArray.CopyTo(array, index);
    }
    int ICollection.Count
    {
        get { return empArray.Count; }
    }
    bool ICollection.IsSynchronized
    {
        get { return false; }
    }
    object ICollection.SyncRoot
    {
        get { return this; }
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return empArray.GetEnumerator();
    }
    public void Add(AssertionAttribute assertionAttribute)
    {
        empArray.Add(assertionAttribute);
    }
}

assertionattributes .cs -应该在xml中作为多个标签出现(如生成)

[Serializable]
[XmlType(Namespace = "urn:oasis:names:tc:SAML:2.0:assertion")]
public class AssertionAttribute
{
    [XmlAttribute(AttributeName = "NameFormat")]
    public string NameFormat = "urn:oasis:names:tc:SAML:2.0:attrname-format:basic";
    [XmlElement(ElementName = "AttributeValue")]
    public AttributeValue attributeValue;
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces();
    public AssertionAttribute(string attributeValueText)
    {
        xmlns.Add("saml", "urn:oasis:names:tc:SAML:2.0:assertion");
        AttributeValueText = attributeValueText; 
        attributeValue = new AttributeValue(attributeValueText);
    }
    private string name;
    [XmlAttribute(AttributeName = "Name")]
    public string Name
    {
        get { return name; }
        set { name = value; }
    }
    private static string attributeValueText;
    public static string AttributeValueText
    {
        get { return attributeValueText; }
        set { attributeValueText = value; }
    }
}

AttributeValue.cs—一个XML值，用于存储该元素的文本值

[Serializable]
[XmlType(Namespace="urn:oasis:names:tc:SAML:2.0:assertion")]
public class AttributeValue
{
    [XmlNamespaceDeclarations]
    public XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces();
    public AttributeValue(string attributeValueText)
    {
        xmlns.Add("saml", "urn.oasis:names:tc:SAML:2.0:assertion");
        Text = attributeValueText;
    }
    private string text;
    [XmlText]
    public string Text
    {
        get { return text; }
        set { text = value; }
    }
}