XmlSchemaValidationException:這是一個無效的xsi:type'Book'嘗試反序列化XML并使用XSD架構對其進行驗證-有解無憂

我有一個包含一系列 LibraryAssets 的 xml，它們是書籍、報紙和專利，而 LibraryAsset 是它們派生的抽象類。我使用 Visual Studio 的創建架構基于該 xml 創建了一個 xsd 架構。但是當我嘗試反序列化 xml 以驗證它是否與架構匹配時，我收到以下錯誤：

System.InvalidOperationException : There is an error in XML document (3, 4).
  ----> System.Xml.Schema.XmlSchemaValidationException : This is an invalid xsi:type 'Book'.
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)

我的 xsd 架構：

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:xsd="http://www.w3.org/2001/XMLSchema"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           attributeFormDefault="unqualified"
           elementFormDefault="qualified">
    <xsd:element name="ArrayOfLibraryAsset">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element maxOccurs="unbounded" name="LibraryAsset">
                    <xsd:complexType>
                        <xsd:sequence>
                            <xsd:element name="Id" type="xsd:unsignedInt" />
                            <xsd:element name="Name" type="xsd:string" />
                            <xsd:element name="YearPublished" type="xsd:unsignedShort" />
                            <xsd:element name="PagesNumber" type="xsd:unsignedByte" />
                            <xsd:element name="Annotation" type="xsd:string" />
                            <xsd:element name="Price" type="xsd:unsignedByte" />
                            <xsd:element minOccurs="0" name="Number" type="xsd:string" />
                            <xsd:element minOccurs="0" name="Inventors">
                                <xsd:complexType>
                                    <xsd:sequence>
                                        <xsd:element name="string" type="xsd:string" />
                                    </xsd:sequence>
                                </xsd:complexType>
                            </xsd:element>
                            <xsd:element minOccurs="0" name="Country" type="xsd:string" />
                            <xsd:element minOccurs="0" name="ApplicationDate" type="xsd:dateTime" />
                            <xsd:element minOccurs="0" name="StandardNumber" type="xsd:string" />
                            <xsd:element minOccurs="0" name="Authors">
                                <xsd:complexType>
                                    <xsd:sequence>
                                        <xsd:element name="string" type="xsd:string" />
                                    </xsd:sequence>
                                </xsd:complexType>
                            </xsd:element>
                            <xsd:element minOccurs="0" name="CityPublished" type="xsd:string" />
                            <xsd:element minOccurs="0" name="Publisher" type="xsd:string" />
                            <xsd:element minOccurs="0" name="CopiesNumber" type="xsd:unsignedShort" />
                            <xsd:element minOccurs="0" name="Issue" type="xsd:unsignedByte" />
                            <xsd:element minOccurs="0" name="IssueDate" type="xsd:dateTime" />
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xs:schema>

Xml 檔案：

<?xml version="1.0"?>
<ArrayOfLibraryAsset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <LibraryAsset xsi:type="Book">
    <Id>62915385</Id>
    <Name>Unspecified</Name>
    <YearPublished>2000</YearPublished>
    <PagesNumber>200</PagesNumber>
    <Annotation>No annotation.</Annotation>
    <Price>50</Price>
    <StandardNumber>000-0-00-000000-0</StandardNumber>
    <Authors>
      <string>Author</string>
    </Authors>
    <CityPublished>Unspecified</CityPublished>
    <Publisher>Unspecified</Publisher>
    <CopiesNumber>300</CopiesNumber>
  </LibraryAsset>
  <LibraryAsset xsi:type="Newspaper">
    <Id>57188600</Id>
    <Name>Unspecified</Name>
    <YearPublished>2021</YearPublished>
    <PagesNumber>25</PagesNumber>
    <Annotation>No annotation.</Annotation>
    <Price>5</Price>
    <StandardNumber>0000-0000</StandardNumber>
    <CityPublished>Unspecified</CityPublished>
    <Publisher>Unspecified</Publisher>
    <CopiesNumber>1500</CopiesNumber>
    <Issue>10</Issue>
    <IssueDate>2021-11-19T00:00:00 04:00</IssueDate>
  </LibraryAsset>
  <LibraryAsset xsi:type="Patent">
    <Id>14464371</Id>
    <Name>Unspecified</Name>
    <YearPublished>2021</YearPublished>
    <PagesNumber>50</PagesNumber>
    <Annotation>No annotation.</Annotation>
    <Price>10</Price>
    <Number>X0000000</Number>
    <Inventors>
      <string>Inventor</string>
    </Inventors>
    <Country>Unspecified</Country>
    <ApplicationDate>2021-11-19T00:00:00 04:00</ApplicationDate>
    <IssueDate>2021-11-18T19:34:16.5902406 04:00</IssueDate>
  </LibraryAsset>
</ArrayOfLibraryAsset>

XML反序列化：

var schemas = new XmlSchemaSet();
schemas.Add(null, shemaFilePath);
Exception exception = null;
var settings = new XmlReaderSettings
{
    Schemas = schemas,
    ValidationType = ValidationType.Schema,
    ValidationFlags =
        XmlSchemaValidationFlags.ProcessIdentityConstraints |
        XmlSchemaValidationFlags.ReportValidationWarnings
};
settings.ValidationEventHandler  = delegate (object sender, ValidationEventArgs args)
{
    if (args.Severity == XmlSeverityType.Warning)
    {
        _log.Warning(args.Message);
    }
    else
    {
        exception ??= args.Exception;
        _log.Error(exception);
        throw exception;
    }
};
using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
using var xmlReader = XmlReader.Create(fileStream, settings);
var xmlSerializer = new XmlSerializer(typeof(List<T>));
data = xmlSerializer.Deserialize(xmlReader) as List<T>;

uj5u.com熱心網友回復：

因此，您的模式生成器具有忽略xsi:type屬性的限制。這不是一個很大的驚喜，很難知道它會用它們做什么。

您顯然知道該工具不知道的一些東西（“LibraryAssets 是書籍、報紙和專利，LibraryAsset 是它們派生自的抽象類”）并且通常的做法是，當您生成模式時，您得到的只是第一次切割，并且您應該編輯它以考慮您對應用程式域語意的了解。

uj5u.com熱心網友回復：

解決方案比我想象的要簡單得多。

所以，基本上，我只需要宣告每種型別（書籍、報紙、專利是抽象 LibraryAsset 的擴展）。最終的解決方案 XSD 如下所示：

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:xsd="http://www.w3.org/2001/XMLSchema"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           attributeFormDefault="unqualified"
           elementFormDefault="qualified">
    <xs:element name="LibraryAsset" type="LibraryAsset" abstract="true"/>
    <xs:element name="Book" type="Book"/>
    <xs:element name="Newspaper" type="Newspaper"/>
    <xs:element name="Patent" type="Patent"/>

    <xsd:complexType name="LibraryAsset" abstract="true">
        <xsd:sequence>
            <xsd:element name="Id" type="xsd:int" />
            <xsd:element name="Name" type="xsd:string" />
            <xsd:element name="YearPublished" type="xsd:int" />
            <xsd:element name="PagesNumber" type="xsd:int" />
            <xsd:element name="Annotation" type="xsd:string" />
            <xsd:element name="Price" type="xsd:int" />
            <xsd:element minOccurs="0" name="Number" type="xsd:string" />
            <xsd:element minOccurs="0" name="Inventors">
                <xsd:complexType>
                    <xsd:sequence>
                        <xsd:element name="string" type="xsd:string" />
                    </xsd:sequence>
                </xsd:complexType>
            </xsd:element>
            <xsd:element minOccurs="0" name="Country" type="xsd:string" />
            <xsd:element minOccurs="0" name="ApplicationDate" type="xsd:dateTime" />
            <xsd:element minOccurs="0" name="StandardNumber" type="xsd:string" />
            <xsd:element minOccurs="0" name="Authors">
                <xsd:complexType>
                    <xsd:sequence>
                        <xsd:element name="string" type="xsd:string" />
                    </xsd:sequence>
                </xsd:complexType>
            </xsd:element>
            <xsd:element minOccurs="0" name="CityPublished" type="xsd:string" />
            <xsd:element minOccurs="0" name="Publisher" type="xsd:string" />
            <xsd:element minOccurs="0" name="CopiesNumber" type="xsd:int" />
            <xsd:element minOccurs="0" name="Issue" type="xsd:int" />
            <xsd:element minOccurs="0" name="IssueDate" type="xsd:dateTime" />
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="Book">
        <xsd:complexContent>
            <xsd:extension base="LibraryAsset">

            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="Newspaper">
        <xsd:complexContent>
            <xsd:extension base="LibraryAsset">

            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="Patent">
        <xsd:complexContent>
            <xsd:extension base="LibraryAsset">

            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="ArrayOfLibraryAsset">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element minOccurs="0" maxOccurs="unbounded" name="LibraryAsset">
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xs:schema>

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標籤：C＃ xml xsd 模式 xsd-验证

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