使用XmlSerializer的多个名称空间(Multiple namespaces with XmlSerializer)

 这是场景： 
 
 我有嵌套类，需要序列化然后在一个XML文档 
 
[XmlRoot(Namespace="http://www.foo.bar/myschema")]
public class root 
{
    [XmlAttribute]
    public string version { get; set; }

    [XmlElement]
    public child child { get; set; }

    ...
}

[XmlRoot(Namespace="http://www.foo.bar/myschema")]
public class child
{
    [XmlElement]
    public int elemA { get; set; }

    [XmlElement]
    public string elemB { get; set; }

    ...
}
 
 我在另一个示例中创建了一个方法来删除其他名称空间并设置一个自定义名称空间： 
 
public static void Save<T>(this T type, string path)
{
    System.Xml.Serialization.XmlSerializer xs = 
        new System.Xml.Serialization.XmlSerializer(type.GetType());

    System.Xml.Serialization.XmlSerializerNamespaces ns = 
        new System.Xml.Serialization.XmlSerializerNamespaces();
    ns.Add("", "http://www.foo.bar/myschema");

    using(XmlWriter file = XmlWriter.Create(path))
    {
        xs.Serialize(file, type, ns);
    }
}
 
 我得到这个代码作为结果： 
 
<?xml version="1.0" encoding="utf-8"?>
<root xmlns="http://www.foo.bar/myschema" version="2.00">
    <child>
        <elemA>1</elemA>
        ...
    </child>
</root>
 
 但预计这一点： 
 
<?xml version="1.0" encoding="utf-8"?>
<root xmlns="http://www.foo.bar/myschema" version="2.00">
    <child xmlns="http://www.foo.bar/myschema">
        <elemA>1</elemA>
        ...
    </child>
</root>
 
 我们必须在两个标签中设置自定义名称空间声明。 这可能吗？ 
 
 编辑： 
 
 这是一个真实世界的例子： 
 
<?xml version="1.0" encoding="UTF-8"?>
<enviNFe xmlns="http://www.portalfiscal.inf.br/nfe" versao="1.01">
    <idLote>200602220000001</idLote>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010001234567890" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010011234567900" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010021234567916" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
</enviNFe>

This is the scenario:
 
I have nested classes and need to serialize then in an xml document
 
[XmlRoot(Namespace="http://www.foo.bar/myschema")]
public class root 
{
    [XmlAttribute]
    public string version { get; set; }

    [XmlElement]
    public child child { get; set; }

    ...
}

[XmlRoot(Namespace="http://www.foo.bar/myschema")]
public class child
{
    [XmlElement]
    public int elemA { get; set; }

    [XmlElement]
    public string elemB { get; set; }

    ...
}
 
I have created an method based in another example to remove additional namespaces and set a custom one:
 
public static void Save<T>(this T type, string path)
{
    System.Xml.Serialization.XmlSerializer xs = 
        new System.Xml.Serialization.XmlSerializer(type.GetType());

    System.Xml.Serialization.XmlSerializerNamespaces ns = 
        new System.Xml.Serialization.XmlSerializerNamespaces();
    ns.Add("", "http://www.foo.bar/myschema");

    using(XmlWriter file = XmlWriter.Create(path))
    {
        xs.Serialize(file, type, ns);
    }
}
 
And I get this code as result:
 
<?xml version="1.0" encoding="utf-8"?>
<root xmlns="http://www.foo.bar/myschema" version="2.00">
    <child>
        <elemA>1</elemA>
        ...
    </child>
</root>
 
But expected this:
 
<?xml version="1.0" encoding="utf-8"?>
<root xmlns="http://www.foo.bar/myschema" version="2.00">
    <child xmlns="http://www.foo.bar/myschema">
        <elemA>1</elemA>
        ...
    </child>
</root>
 
We must set the custom namespace declaration in both tags. Is this possible?
 
Edit:
 
Here is a real-world example:
 
<?xml version="1.0" encoding="UTF-8"?>
<enviNFe xmlns="http://www.portalfiscal.inf.br/nfe" versao="1.01">
    <idLote>200602220000001</idLote>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010001234567890" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010011234567900" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
    <NFe xmlns="http://www.portalfiscal.inf.br/nfe">
        <infNFe Id="NFe31060243816719000108550000000010021234567916" versao="1.01">
        ...
        <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
        ...
    </NFe>
</enviNFe>

原文：https://stackoverflow.com/questions/8232264