XML 删除 nil 属性

本文关键字：属性 nil 删除 XML | 更新日期: 2023-09-27 18:34:03

我正在执行一些 XmlOverrides 并将属性设置为可为空（在本例中为 F1）。我想删除 nil="true" 和此属性周围的命名空间，但我无法使用我尝试过的任何方法删除它。 

Nested n = new Nested();
n.Nest = "2";
n.F1 = null;
XmlAttributeOverrides overrides = new XmlAttributeOverrides();
XmlAttributes att = new XmlAttributes();
XmlElementAttribute el = new XmlElementAttribute("F1");
el.IsNullable = true;
att.XmlElements.Add(el);
overrides.Add(typeof(Nested), "F1", att);
XmlSerializer xs = new XmlSerializer(typeof(Nested), overrides);
var faultDocument = new XmlDocument();
var nav = faultDocument.CreateNavigator();
var ns = new XmlSerializerNamespaces();
ns.Add("", "");
using (var writer = nav.AppendChild())
{
    xs.Serialize(writer, n, ns);
}

我得到的XML是这样的：

<Nested>
    <F1 p2:nil="true" xmlns:p2="http://www.w3.org/2001/XMLSchema-instance"/>
    <Nest>2</Nest>
</Nested>

但是我希望 F1 元素为空，没有 nil 和 xmlns

<Nested>
    <F1/>
    <Nest>2</Nest>
</Nested>

XML 删除 nil 属性

尝试在属性 F1 中添加嵌套类[XmlElement(ElementName = "F1", IsNullable = true)]。

我设法解决了它，不确定这是否是最好的方法：

private static void RemoveNils(XElement elem)
{
        string nilNamespace = "{http://www.w3.org/2001/XMLSchema-instance}nil";
        //first condition should be enough, the rest are just fail-safes
        if (elem.Attributes().Any(name => name.Name == nilNamespace) && elem.Elements().Count() == 0 && elem.IsEmpty)
        {
            elem.Attributes().Remove();
            return;
        }
        foreach (XElement el in elem.Elements())
            RemoveNils(el);
}

试试这个

Nested n = new Nested();
n.Nest = "2";
n.F1 = null;
XmlAttributeOverrides overrides = new XmlAttributeOverrides();
XmlAttributes att = new XmlAttributes();
XmlElementAttribute el = new XmlElementAttribute("F1");
el.IsNullable = true;
att.XmlElements.Add(el);
overrides.Add(typeof(Nested), "F1", att);
XmlSerializer xs = new XmlSerializer(typeof(Nested));
var faultDocument = new XmlDocument();
var nav = faultDocument.CreateNavigator();
StringWriter strWriter = new StringWriter();
XmlTextWriter TextWriter = new XmlTextWriter(strWriter);
var ns = new XmlSerializerNamespaces();
ns.Add("", "");
xs.Serialize(TextWriter, n, ns);
ReqXml = strWriter.ToString();
TextWriter.Close();
return ReqXml;
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