XML System.InvalidOperationException：重複屬性

這個想法是，我需要從我的web服務返回一個公告列表和視頻列表作爲字符串。我在將列表放入XML模式時遇到問題。XML System.InvalidOperationException：重複屬性

這裏是我的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>

我用下面的C＃填充我的數據：

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元素的線條，其實是內部循環，其中我從我的數據庫中讀取信息，但爲了簡潔，我排除了這些代碼。

它將三個Announcement元素加載到架構中沒有問題。當它試圖加載第一Video元素，它崩潰給了以下錯誤：

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)

來源

2013-07-11 Chris

您要添加的同一屬性多次，這是不允許的

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)

來源

2013-07-11 14:46:37 Riv

你要加入Video中有三個HTML屬性。我覺得應該是：

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) 
));

來源

2013-07-11 14:47:01 Fung

我認爲這些屬性應該有每個人不同的名字，這就是爲什麼它是抱怨重複的屬性...

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

你可能想這樣寫

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

來源

2013-07-11 14:47:08

XML System.InvalidOperationException：重複屬性

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