Custom type as XMLAttribute

I have a custom struct type that supports implicit conversion to and from string. I can serialize this struct as an element without any problems with the using the XmlText attribute on a public property.

struct Test
{
    [XmlText]
    public string Value {get(...);set(...);}
}

class Other
{
    [XmlElement] // this renders as <TestElemen开发者_运维知识库t>value</TestElement>
    public Test TestElement {get; set;} 

    [XmlAttribute] // this fails at runtime
    public Test TestElement {get; set;} 
}

However, I cannot serialize it as an attribute. Is there anyway to make it work?

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[XmlText] means to serialize the data as the text value of an element. It cannot be used for an attribute.