c# - 了解 System.Xml.Serialization.XmlIgnoreAttribute 与基类

Question

我有两个类，如下所示:

[Serializable]
[XmlInclude(typeof(SomeDerived))]
public class SomeBase
{
    public string SomeProperty { get; set; }
}

public class SomeDerived : SomeBase
{
    [XmlIgnore]
    public new string SomeProperty { get; set; }
}

当我序列化 SomeDerived 的实例时我不希望看到 SomeProperty 的值.不过，我愿意。我尝试过其他方法，例如使用 SomeProperty声明为 virtual在 SomeBase并在 SomeDerived 中覆盖它.我仍然在 SomeDerived 的序列化实例中看到它.

谁能解释一下 XmlIgnoreAttribute 是怎么回事？ ?

为了完整起见，我的反序列化代码如下

class Program
{
    static void Main(string[] args)
    {
        SomeDerived someDerived = new SomeDerived { SomeProperty = "foo" };

        XmlSerializer ser = new XmlSerializer(typeof(SomeBase));

        MemoryStream memStream = new MemoryStream();
        XmlTextWriter xmlWriter = new XmlTextWriter(memStream, Encoding.Default);
        ser.Serialize(memStream, someDerived);

        xmlWriter.Close();
        memStream.Close();
        string xml = Encoding.Default.GetString(memStream.GetBuffer());

        Console.WriteLine(xml);
        Console.ReadLine();
    }
}

编辑

如果我将序列化程序声明更改为 new XmlSerializer(typeof(SomeDerived))，我会得到相同的行为.

Answer 1

试试这个。它使用 XmlSerializer 构造函数上的覆盖来传递一些序列化覆盖:

SomeDerived someDerived = new SomeDerived { SomeProperty = "foo" };

// Create the XmlAttributeOverrides and XmlAttributes objects.
XmlAttributeOverrides overrides = new XmlAttributeOverrides();
XmlAttributes attrs = new XmlAttributes();

/* Use the XmlIgnore to instruct the XmlSerializer to ignore
    the GroupName instead. */
attrs = new XmlAttributes();
attrs.XmlIgnore = true;
overrides.Add(typeof(SomeBase), "SomeProperty", attrs);

XmlSerializer ser = new XmlSerializer(typeof(SomeBase), overrides);

MemoryStream memStream = new MemoryStream();
XmlTextWriter xmlWriter = new XmlTextWriter(memStream, Encoding.Default);
ser.Serialize(memStream, someDerived);

xmlWriter.Close();
memStream.Close();
string xml = Encoding.Default.GetString(memStream.GetBuffer());