XML System.InvalidOperationException:属性重复

本文关键字：属性 System InvalidOperationException XML | 更新日期: 2023-09-27 18:22:08

我的想法是，我需要从web服务中以字符串的形式返回一个公告列表和一个视频列表。我在将列表放入XML模式时遇到问题。

这是我的XML模式：

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="WelcomeScreenSchema"
    elementFormDefault="qualified"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:attribute name="ID" type="xs:int"/>
  <xs:attribute name="Added" type="xs:dateTime"/>
  <xs:element name="WelcomeScreen">
    <xs:complexType>
      <xs:all>
        <xs:element ref="Announcements" maxOccurs="1" minOccurs="1" />
        <xs:element ref="Videos" maxOccurs="1" minOccurs="1" />
      </xs:all>
    </xs:complexType>
  </xs:element>
  <xs:element name="Announcements">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Announcement" maxOccurs="unbounded" minOccurs="0"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="Videos">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Video" maxOccurs="unbounded" minOccurs="0"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="Announcement">
    <xs:complexType>
      <xs:attribute ref="ID" use="required"/>
      <xs:attribute ref="Added" use="required"/>
      <xs:attribute name="HTML" type="xs:string" use="required"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="Video">
    <xs:complexType>
      <xs:attribute ref="ID" use="required"/>
      <xs:attribute ref="Added" use="required"/>
      <xs:attribute name="URL" type="xs:string" use="required"/>
      <xs:attribute name="Title" type="xs:string" use="required"/>
      <xs:attribute name="Description" type="xs:string" use="required"/>
    </xs:complexType>
  </xs:element>
</xs:schema>

我正在使用以下C#填充我的数据：

XmlObject result = new XmlObject("C:'path'to'schema.xsd");
result.Add(new XElement("WelcomeScreen"));
result.Root.Add(new XElement("Announcements"));
result.Root.Add(new XElement("Videos"));
result.Root.Element("Announcements").Add(new XElement("Announcement",
    new XAttribute("ID", Convert.ToString(id)),
    new XAttribute("HTML", html),
    new XAttribute("Added", added)
));
result.Root.Element("Videos").Add(new XElement("Video",
    new XAttribute("ID", Convert.ToString(id)),
    new XAttribute("HTML", URL),
    new XAttribute("HTML", Title),
    new XAttribute("HTML", Description),
    new XAttribute("Added", added)
));

我添加Announcement和Video元素的行实际上是在从数据库中读取信息的循环中，但为了简洁起见，我排除了该代码。

它将三个Announcement元素毫无问题地加载到模式中。当它试图加载第一个Video元素时，它崩溃，给出以下错误：

System.Exception was unhandled
  HResult=-2146233088
  Message=Error getting Welcome Screen info from DB. : System.InvalidOperationException: Duplicate attribute.
   at System.Xml.Linq.XElement.AddAttributeSkipNotify(XAttribute a)
   at System.Xml.Linq.XContainer.AddContentSkipNotify(Object content)
   at System.Xml.Linq.XContainer.AddContentSkipNotify(Object content)

XML System.InvalidOperationException:属性重复

您多次添加同一属性，这是不允许的

result.Root.Element("Videos").Add(new XElement("Video",
new XAttribute("ID", Convert.ToString(id)),
new XAttribute("HTML", URL),
new XAttribute("HTML", Title),
new XAttribute("HTML", Description),
new XAttribute("Added", added)

您正试图在Video中添加三个HTML属性。我认为应该是：

result.Root.Element("Videos").Add(new XElement("Video",
    new XAttribute("ID", Convert.ToString(id)),
    new XAttribute("URL", URL),
    new XAttribute("Title", Title),
    new XAttribute("Description", Description),
    new XAttribute("Added", added)
));

我认为这些属性每个都应该有不同的名称，这就是为什么它抱怨属性重复。。。

new XAttribute("HTML", URL),
new XAttribute("HTML", Title),
new XAttribute("HTML", Description),

你可能想这样写

new XAttribute("URL", URL),
new XAttribute("Title", Title),
new XAttribute("Description", Description),
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