Xml 使用自定义架构和 IXmlSerializable 进行序列化

Xml serialization with custom schema and IXmlSerializable

我正在尝试使用 IXmlSerializableXmlSchemaProviderAttribute 序列化一个对象。

架构如下所示:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="BuildingsSchema" targetNamespace="BuildingModelSchema"
    elementFormDefault="qualified"
    xmlns="BuildingModelSchema"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
>
    <xs:element name="buildings">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="building" minOccurs="0" maxOccurs="unbounded">
                    <xs:complexType>
                        <xs:sequence>
                        ...

获取架构的代码如下所示(已找到 here):

[<Literal>]
let XML_NAMESPACE                       = "BuildingModelSchema"
[<Literal>]
let XSD_SCHEMA_PATH                     = @"BuildingsSchema.xsd"

[<XmlSchemaProvider(BuildingsSchema)>]
type BuildingsStatistics() =
    interface IXmlSerializable with
    ...
    static member BuildingsSchema(xs: XmlSchemaSet) =
        let serializer = new XmlSerializer(typeof<XmlSchema>)
        let schema = (serializer.Deserialize(new XmlTextReader(XSD_SCHEMA_PATH), null)) :?> XmlSchema
        xs.XmlResolver <- new XmlUrlResolver()
        xs.Add(schema) |> ignore

        new XmlQualifiedName("buildings", XML_NAMESPACE)
    ...

现在,当我尝试使用 XmlSerializer 序列化一个对象时,出现异常: {"PlanerModel.BuildingsStatistics.BuildingsSchema() must return a valid type name. Type 'buildings' cannot be found in the targetNamespace='BuildingModelSchema'."}

编辑:
在尝试反序列化有效的测试文档后,我收到了相同的错误消息。我预计 xml 模式有问题,但由于这是我第一次使用 xml 模式,我似乎没有发现错误。

进一步测试表明,XmlSerializer初始化时抛出异常:

XmlSerializer ser = new XmlSerializer(typeof(BuildingsStatistics)); // Exception is thrown here
ser.Deserialize(...)                                                // Will not be executed

此外,在 BuildingsSchema 方法中添加的 XmlSchema 不包含任何元素(在我的例子中,0 个元素和 14 个项目都是 'empty' (没有行号,位置等)).

我找到了问题的解决方案:我必须将架构定义更改为

<xs:complexType name="buildingsType">
    <xs:sequence>
        <xs:element name="building" type="buildingType" minOccurs="1" maxOccurs="unbounded"/>
    </xs:sequence>
</xs:complexType>
...

BuildingsSchema里面返回的XmlQualifiedName

new XmlQualifiedName("buildingType", XML_NAMESPACE)