XmlSerializer的和可空属性 [英] XmlSerializer and nullable attributes

问题描述

我有一类与众多可空＆LT; T＆GT;我想序列化到XML的属性的属性。这显然​​是一个没有没有，因为他们被认为是复杂类型。所以，相反，我实现了*指定的模式，我在那里创造的附加价值*和*指定属性如下：

I have a class with numerous Nullable<T> properties which I want to be serializable to XML as attributes. This is apparently a no-no as they are considered 'complex types'. So, instead I implement the *Specified pattern, where I create an addition *Value and *Specified property as follows:

[XmlIgnore]
public int? Age
{
    get { return this.age; }
    set { this.age = value; }
}

[XmlAttribute("Age")]
public int AgeValue
{
    get { return this.age.Value; }
    set { this.age = value; }
}

[XmlIgnore]
public bool AgeValueSpecified
{
    get { return this.age.HasValue; }
}

工作正常 - 如果时代属性的值，它是序列化的属性。如果它不具有一个值，它不是序列。

Which works fine - if the 'Age' property has a value, it is serialized as an attribute. If it doesn't have a value, it isn't serialized.

现在的问题是，正如我提到的，有很多可空，在我的班级和这种模式只是使事情混乱和失控。

The problem is that, as I mentioned, a have a lot of Nullable-s in my class and this pattern is just making things messy and unmanageable.

我希望有一种方法，使可空更XmlSerializer的友好。或者，如果做不到这一点，一种方式来创建一个可空更换在。

I'm hoping there is a way to make Nullable more XmlSerializer friendly. Or, failing that, a way to create a Nullable replacement which is.

有没有人有任何想法我怎么能做到这一点？

Does anyone have any ideas how I could do this?

感谢。

推荐答案

实现您的类的IXmlSerializable 接口。然后，您可以处理特殊情况，例如在 ReadXML的和中WriteXML 方法nullables。 <一href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.ixmlserializable.aspx">There's一个很好的例子，在MSDN文档页面。的。

Implement the IXmlSerializable interface on your class. You can then handle special cases such as nullables in the ReadXML and WriteXML methods. There's a good example in the MSDN documentation page..

 
class YourClass : IXmlSerializable
{
    public int? Age
    {
        get { return this.age; }
        set { this.age = value; }
    }

    //OTHER CLASS STUFF//

    #region IXmlSerializable members
    public void WriteXml (XmlWriter writer)
    {
        if( Age != null )
        {
            writer.WriteValue(writer)
        }
    }

    public void ReadXml (XmlReader reader)
    {
        Age = reader.ReadValue();
    }

    public XmlSchema GetSchema()
    {
        return(null);
    }
    #endregion
}

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