C# 从.NET将类型序列化为XML

我有这种C#4.0类型

我想使用XmlSerializer将类型序列化为

<Val Estimate="true">123</Val>

123

理想情况下，如果估计属性的值为false，我希望省略它。将估算值更改为可为空的布尔值是可以接受的

从这种类型到这种XML表示需要哪些属性/实现

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谢谢。

不确定是否可以仅使用属性有条件地输出估算值。但您确实可以实现IXmlSerializable并检查WriteXml方法中的估计值

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这里有一个

有条件地省略

估计值

将需要一个lof编码。我不会走那条路

XmlWriter writer = XmlWriter.Create(stream, new XmlWriterSettings() { OmitXmlDeclaration = true });

var ns = new XmlSerializerNamespaces();
ns.Add("", "");

XmlSerializer xml = new XmlSerializer(typeof(DecimalField));

xml.Serialize(writer, obj, ns);

-

还可以使用Linq2Xml手动序列化类

List<XObject> list = new List<XObject>();
list.Add(new XText(obj.Value.ToString()));
if (obj.Estimate) list.Add(new XAttribute("Estimate", obj.Estimate));

XElement xElem = new XElement("Val", list.ToArray());

xElem.Save(stream);

List List=新列表（）；
添加（新的XText（obj.Value.ToString（））；
if（目标估算）列表添加（新的X属性（“估算”，目标估算））；
XElement xElem=新XElement（“Val”，list.ToArray（））；
xElem.Save（流）；

这是您在不实现IXmlSerializable的情况下所能得到的最接近的结果（始终包含估算属性）：

[XmlRoot("Val")]
public class DecimalField
{
    [XmlText()]
    public decimal Value { get; set; }
    [XmlAttribute("Estimate")]
    public bool Estimate { get; set; }
}

使用IXmlSerializable，您的类如下所示：

[XmlRoot("Val")]
public class DecimalField : IXmlSerializable
{
    public decimal Value { get; set; }
    public bool Estimate { get; set; }

    public void WriteXml(XmlWriter writer)
    {
        if (Estimate == true)
        {
            writer.WriteAttributeString("Estimate", Estimate.ToString());
        }

        writer.WriteString(Value.ToString());
    }

    public void ReadXml(XmlReader reader)
    {
        if (reader.MoveToAttribute("Estimate") && reader.ReadAttributeValue())
        {
            Estimate = bool.Parse(reader.Value);
        }
        else
        {
            Estimate = false;
        }

        reader.MoveToElement();
        Value = reader.ReadElementContentAsDecimal();
    }

    public XmlSchema GetSchema()
    {
        return null;
    }
}

    XmlSerializer xs = new XmlSerializer(typeof(DecimalField));

    string serializedXml = null;
    using (StringWriter sw = new StringWriter())
    {
        DecimalField df = new DecimalField() { Value = 12.0M, Estimate = false };
        xs.Serialize(sw, df);
        serializedXml = sw.ToString();
    }

    Console.WriteLine(serializedXml);

    using (StringReader sr = new StringReader(serializedXml))
    {
        DecimalField df = (DecimalField)xs.Deserialize(sr);

        Console.WriteLine(df.Estimate);
        Console.WriteLine(df.Value);
    }

您可以这样测试您的类：

[XmlRoot("Val")]
public class DecimalField : IXmlSerializable
{
    public decimal Value { get; set; }
    public bool Estimate { get; set; }

    public void WriteXml(XmlWriter writer)
    {
        if (Estimate == true)
        {
            writer.WriteAttributeString("Estimate", Estimate.ToString());
        }

        writer.WriteString(Value.ToString());
    }

    public void ReadXml(XmlReader reader)
    {
        if (reader.MoveToAttribute("Estimate") && reader.ReadAttributeValue())
        {
            Estimate = bool.Parse(reader.Value);
        }
        else
        {
            Estimate = false;
        }

        reader.MoveToElement();
        Value = reader.ReadElementContentAsDecimal();
    }

    public XmlSchema GetSchema()
    {
        return null;
    }
}

    XmlSerializer xs = new XmlSerializer(typeof(DecimalField));

    string serializedXml = null;
    using (StringWriter sw = new StringWriter())
    {
        DecimalField df = new DecimalField() { Value = 12.0M, Estimate = false };
        xs.Serialize(sw, df);
        serializedXml = sw.ToString();
    }

    Console.WriteLine(serializedXml);

    using (StringReader sr = new StringReader(serializedXml))
    {
        DecimalField df = (DecimalField)xs.Deserialize(sr);

        Console.WriteLine(df.Estimate);
        Console.WriteLine(df.Value);
    }

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我认为使用一些属性可以实现这一点。但不确定属性是什么。