如何使用 SGen 为映射到两级数组的 XML 模式生成序列化程序集？

Question

我正在使用需要 XmlSerializerFormat 合约的第三方服务；我想通过创建序列化程序集来加快启动速度，但 Sgen.exe 确实不喜欢 Xsd.exe 为其吐出嵌套数组的架构中的特定构造。

该模式包括嵌套两层深度的元素序列，如下所示：

Foo.xsd

<xs:schema targetNamespace="http://example.com" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://example.com" elementFormDefault="qualified">

    <xs:element name="Foo" type="Foo"/>

    <xs:complexType name="Foo">

        <xs:sequence>

            <xs:element name="List" type="FooList" minOccurs="0" maxOccurs="unbounded"/>

        </xs:sequence>

    </xs:complexType>

    <xs:complexType name="FooList">

        <xs:sequence>

            <xs:element name="Item" type="FooListItem" minOccurs="0" maxOccurs="unbounded"/>

        </xs:sequence>

    </xs:complexType>

    <xs:complexType name="FooListItem">

        <xs:simpleContent>

            <xs:extension base="xs:string"/>

        </xs:simpleContent>

    </xs:complexType>

</xs:schema>

即：一个 toplevelFoo包含多个FooLists，aFooList包含多个FooListItem。

运行xsd /c Foo.xsd会产生以下结果：

Foo.cs

using System.Xml.Serialization;

[XmlType(Namespace="http://example.com")]

[XmlRoot(Namespace="http://example.com", IsNullable=false)]

public partial class Foo {

    private FooListItem[][] listField;

    [XmlArrayItem("Item", typeof(FooListItem), IsNullable=false)]

    public FooListItem[][] List {

        get {

            return this.listField;

        }

        set {

            this.listField = value;

        }

    }

}

也就是说，FooList由于某种原因，不存在 for 类，而是只有一个嵌套的FooListItems 数组。

然而，当我构建它并仅使用生成的 DLL 运行 Sgen.exe 时sgen /keep obj\Debug\net461\Foo.dll，会出现以下错误消息：

错误CS0030：无法将类型“FooListItem []”转换为“FooListItem”

错误CS0029：无法将类型“FooListItem”隐式转换为“FooListItem []”

因此，Xsd.exe 和 Sgen.exe 似乎试图实现这样一种模式，即元素具有包含 X 项的显式“X 列表”子元素，而无需为列表元素创建单独的类，而仅依赖于序列化的名称合成中间元素的性能；当列表元素本身可能重复时，这种情况就会中断。

有办法解决这个问题吗？就像强制 Xsd.exe 为中间元素生成一个类一样？我想这可能是 Xsd.exe 和 Sgen.exe 中的一个实际错误，但这在合理的时间范围内并不能真正帮助我。

如上所述，这是第三方服务；我完全无法控制架构，并且对生成代码的手动编辑越少越好，因为我的实际文件有数万行长。

Answer 1

错误就在这一行来自： [XmlArrayItem("Item", typeof(FooListItem), IsNullable=false)]至：“[XmlArrayItem（“Item”，IsNullable = false）]这是工作代码的示例：using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Xml;using System.Xml.Serialization;namespace ConsoleApplication1{&nbsp; &nbsp; class Program&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; const string FILENAME = @"c:\temp\test.xml";&nbsp; &nbsp; &nbsp; &nbsp; static void Main(string[] args)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; namespaces.Add("xs", "http://www.w3.org/2001/XMLSchema");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; namespaces.Add("", "http://example.com");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; XmlWriterSettings settings = new XmlWriterSettings();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; settings.Indent = true;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; XmlWriter writer = XmlWriter.Create(FILENAME, settings);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; XmlSerializer serializer = new XmlSerializer(typeof(Foo));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Foo foo = new Foo()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; List = new FooListItem[][] {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem[] {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "abc"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "abd"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "abe"}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem[] {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "bbc"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "bbd"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "bbe"}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem[] {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "cbc"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "cbd"},&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new FooListItem() { Value = "cbe"}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; serializer.Serialize(writer, foo, namespaces);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; [XmlType(Namespace = "http://example.com")]&nbsp; &nbsp; [XmlRoot(Namespace = "http://example.com", IsNullable = false)]&nbsp; &nbsp; public partial class Foo&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; private FooListItem[][] listField;&nbsp; &nbsp; &nbsp; &nbsp; [XmlArrayItem("Item", IsNullable = false)]&nbsp; &nbsp; &nbsp; &nbsp; public FooListItem[][] List&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; get&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return this.listField;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; set&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.listField = value;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; [XmlType(Namespace = "http://example.com")]&nbsp; &nbsp; public partial class FooListItem&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; private string valueField;&nbsp; &nbsp; &nbsp; &nbsp; [XmlText]&nbsp; &nbsp; &nbsp; &nbsp; public string Value&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; get&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return this.valueField;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; set&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; this.valueField = value;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }