Question

这是序列化Complex[]对象时获得的XML输出：

<MyClass>               
    <Complex />
    <Complex />
    <Complex />
    <Complex />
</MyClass>

Complex结构被标记为可序列化，并且作为结构，它具有隐式无参数构造函数。那么为什么每个Complex对象都不能序列化它的实部和虚部呢？是否与结构的'Real'和“Imaginary”属性具有getter但不具有setter的事实有关？

感谢。

Answer 1

这取决于您用于序列化对象的序列化程序的实现如果您尝试这样做，您将得到您所期望的：

using System.IO;
using System.Numerics;
using System.Runtime.Serialization.Formatters.Soap;

public class Test {
    public static void Main() {
        var c = new Complex(1, 2);
        Stream stream = File.Open("data.xml", FileMode.Create);
        SoapFormatter formatter = new SoapFormatter();
        formatter.Serialize(stream, c);
        stream.Close();
    }
}

相反，如果您使用System.Xml.Serialization命名空间中的类，您将得到类似于您发布的内容：

using System;
using System.IO;
using System.Numerics;
using System.Xml.Serialization;

public class Test {
    public static void Main() {
        var c = new Complex(1, 2);
        XmlSerializer s = new XmlSerializer(typeof(Complex));
        StringWriter sw = new StringWriter();
        s.Serialize(sw, c);
        Console.WriteLine(sw.ToString());
    }
}

我认为这是因为XmlSerializer不会序列化私有成员（m_real结构中的m_imaginary和Complex）。

Answer 2

XmlSerializer没有序列化没有setter的属性（IIRC它只使用公共getter和setter序列化公共属性）。您有几个选择：

将System.Numerics.Complex类型替换为您创建的类型（并具有“完整”属性）
通过MyClass界面更改IXmlSerializable类以处理复数的序列化（和反序列化）。

第二个选项如下所示。

public class StackOverflow_10523009
{
    public class MyClass : IXmlSerializable
    {
        public Complex[] ComplexNumbers;

        public XmlSchema GetSchema()
        {
            return null;
        }

        public void ReadXml(XmlReader reader)
        {
            reader.ReadStartElement("MyClass");
            List<Complex> numbers = new List<Complex>();
            while (reader.IsStartElement("Complex"))
            {
                Complex c = new Complex(
                    double.Parse(reader.GetAttribute("Real")),
                    double.Parse(reader.GetAttribute("Imaginary")));
                numbers.Add(c);
                reader.Skip();
            }

            reader.ReadEndElement();
            this.ComplexNumbers = numbers.ToArray();
        }

        public void WriteXml(XmlWriter writer)
        {
            foreach (var complex in ComplexNumbers)
            {
                writer.WriteStartElement("Complex");
                writer.WriteStartAttribute("Real"); writer.WriteValue(complex.Real); writer.WriteEndAttribute();
                writer.WriteStartAttribute("Imaginary"); writer.WriteValue(complex.Imaginary); writer.WriteEndAttribute();
                writer.WriteEndElement();
            }
        }

        public override string ToString()
        {
            return "MyClass[" + string.Join(",", ComplexNumbers) + "]";
        }
    }
    public static void Test()
    {
        MyClass mc = new MyClass { ComplexNumbers = new Complex[] { new Complex(3, 4), new Complex(0, 1), new Complex(1, 0) } };
        XmlSerializer xs = new XmlSerializer(typeof(MyClass));
        MemoryStream ms = new MemoryStream();
        xs.Serialize(ms, mc);
        Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray()));
        ms.Position = 0;
        MyClass mc2 = (MyClass)xs.Deserialize(ms);
        Console.WriteLine(mc2);
    }
}

如何使用XmlSerializer序列化'System.Numerics.Complex'？

2 个答案: