SyndicationItem.ElementExtensions 属性

定义

命名空间:

System.ServiceModel.Syndication

程序集:

System.ServiceModel.Syndication.dll

程序集:

System.ServiceModel.dll, System.ServiceModel.Syndication.dll

程序集:

System.ServiceModel.Web.dll

程序集:

System.ServiceModel.dll

程序集:

System.ServiceModel.dll, System.ServiceModel.Web.dll

获取联合项中包含的元素扩展。

public:
 property System::ServiceModel::Syndication::SyndicationElementExtensionCollection ^ ElementExtensions { System::ServiceModel::Syndication::SyndicationElementExtensionCollection ^ get(); };

public System.ServiceModel.Syndication.SyndicationElementExtensionCollection ElementExtensions { get; }

member this.ElementExtensions : System.ServiceModel.Syndication.SyndicationElementExtensionCollection

Public ReadOnly Property ElementExtensions As SyndicationElementExtensionCollection

属性值

SyndicationElementExtensionCollection

一个包含元素扩展的 SyndicationElementExtensionCollection。

示例

下面的代码演示如何将元素扩展添加到 SyndicationItem 实例。

SyndicationItem item = new SyndicationItem();

// Add several different types of element extensions
item.ElementExtensions.Add("simpleString", "", "hello, world!");
item.ElementExtensions.Add("simpleString", "", "another simple string");

// DataContractExtension is a user-defined type marked with the DataContractAttribute
item.ElementExtensions.Add(new DataContractExtension() { Key = "X", Value = 4 });

// XmlSerializerExtension is a user-defined type that defines a ToString() method
item.ElementExtensions.Add(new XmlSerializerExtension() { Key = "Y", Value = 8 }, new XmlSerializer(typeof(XmlSerializerExtension)));

item.ElementExtensions.Add(new XElement("xElementExtension", new XElement("Key", new XAttribute("attr1", "someValue"), "Z"),
    new XElement("Value", new XAttribute("attr1", "someValue"), "15")).CreateReader());

Dim item As New SyndicationItem()

' Add several different types of element extensions
item.ElementExtensions.Add("simpleString", "", "hello, world!")
item.ElementExtensions.Add("simpleString", "", "another simple string")

' DataContractExtension is a user-defined type marked with the DataContractAttribute
item.ElementExtensions.Add(New DataContractExtension With {.Key = "X", .Value = 4})

' XmlSerializerExtension is a user-defined type that defines a ToString() method
item.ElementExtensions.Add(New XmlSerializerExtension With {.Key = "Y", .Value = 8}, New XmlSerializer(GetType(XmlSerializerExtension)))

item.ElementExtensions.Add(New XElement("xElementExtension", New XElement("Key", New XAttribute("attr1", "someValue"), "Z"), _
        New XElement("Value", New XAttribute("attr1", "someValue"), "15")).CreateReader())

注解

元素扩展是 Atom 1.0 或 RSS 2.0 规范中未指定的有效 XML 元素。 可以添加任何有效的 XML 元素作为扩展，只要该元素的命名空间与外层命名空间不同。 序列化后，扩展的写入形式与任何其他 XML 元素类似。

<mg:MyElement xmlns:mg="http://myserver/elements" />  

有关演示如何添加元素扩展的完整示例，请参阅 “松散类型扩展 ”示例。