我怎样才能XmlSerializer的为en code布尔变量是/否？ [英] How can I get XmlSerializer to encode bools as yes/no?

问题描述

我发送XML到另一个程序，它预计布尔标志为是或否，而不是真或假。

I'm sending xml to another program, which expects boolean flags as "yes" or "no", rather than "true" or "false".

我已经定义就像一个类：

I have a class defined like:

[XmlRoot()]
public class Foo {
    public bool Bar { get; set; }
}

当我序列化，我的输出是这样的：

When I serialize it, my output looks like this:

<Foo><Bar>true</Bar></Foo>

不过，我想它是这样的：

But I would like it to be this:

<Foo><Bar>yes</Bar></Foo>

我可以做到这一点的序列化的时间呢？我想preFER不要有诉诸这样的：

Can I do this at the time of serialization? I would prefer not to have to resort to this:

[XmlRoot()]
public class Foo {
    [XmlIgnore()]
    public bool Bar { get; set; }

    [XmlElement("Bar")]
    public string BarXml { get { return (Bar) ? "yes" : "no"; } }
}

请注意，我也希望能够到的反序列化的这些数据又回来了。

Note that I also want to be able to deserialize this data back again.

推荐答案

好吧，我一直在寻找这个多一些。这里是什么我已经出来了：

Ok, I've been looking into this some more. Here's what I've come up with:

// use this instead of a bool, and it will serialize to "yes" or "no"
// minimal example, not very robust
public struct YesNo : IXmlSerializable {

    // we're just wrapping a bool
    private bool Value;

    // allow implicit casts to/from bool
    public static implicit operator bool(YesNo yn) {
        return yn.Value;
    }
    public static implicit operator YesNo(bool b) {
        return new YesNo() {Value = b};
    }

    // implement IXmlSerializable
    public XmlSchema GetSchema() { return null; }
    public void ReadXml(XmlReader reader) {
        Value = (reader.ReadElementContentAsString() == "yes");
    }
    public void WriteXml(XmlWriter writer) {
        writer.WriteString((Value) ? "yes" : "no");
    }
}

然后我改变我的Foo类这样：

Then I change my Foo class to this:

[XmlRoot()]
public class Foo {      
    public YesNo Bar { get; set; }
}

请注意，由于 YESNO 隐式强制转换为布尔（反之亦然），你仍然可以这样做：

Note that because YesNo is implicitly castable to bool (and vice versa), you can still do this:

Foo foo = new Foo() { Bar = true; };
if ( foo.Bar ) {
   // ... etc

在换句话说，你可以把它当作一个布尔值。

In other words, you can treat it like a bool.

和w00t！它系列化这样：

And w00t! It serializes to this:

<Foo><Bar>yes</Bar></Foo>

它还正确反序列化。

It also deserializes correctly.

有可能是某种方式得到我的XmlSerializer的自动施放任何布尔的IT遇到以 YESNO 译文]它去 - 但我还没有找到它。有人吗？

There is probably some way to get my XmlSerializer to automatically cast any bools it encounters to YesNos as it goes - but I haven't found it yet. Anyone?

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