XmlEntity.BaseURI 属性

定义

获取当前节点的基础统一资源标识符 (URI)。Gets the base Uniform Resource Identifier (URI) of the current node.

public:
 virtual property System::String ^ BaseURI { System::String ^ get(); };
public override string BaseURI { get; }
member this.BaseURI : string
Public Overrides ReadOnly Property BaseURI As String

属性值

String

从其加载节点的位置。The location from which the node was loaded.

注解

联网的 XML 文档包含使用各种万维网联合会 (W3C) 标准包含机制聚合的数据块,因此包含来自不同位置的节点。A networked XML document is comprised of chunks of data aggregated using various World Wide Web Consortium (W3C) standard inclusion mechanisms and therefore contains nodes that come from different places. BaseURI会告诉你这些节点的来源。The BaseURI tells you where these nodes came from.

此属性的值根据节点类型的不同而异。The value of this property varies depending on the node type. 作为外部 EntityReference 节点的子级的节点返回实体本身的位置。Nodes which are children of external EntityReference nodes return the location of the entity itself. 例如,请看下面的 XML 文档:For example, consider the following XML document:

<!DOCTYPE item [  
<!ENTITY xyz SYSTEM "a/b.xml">  
]>  
<item num='123'>&xyz;</item>  

其中,外部实体 a/b.xml 包含 XML 文本 <test>123</test>where the external entity a/b.xml contains the XML text <test>123</test>.

如果从加载文档,则 http://server/mydata.xml BaseURI 返回以下内容:If the document is loaded from http://server/mydata.xml, BaseURI returns the following:

NodeTypeNodeType 名称Name BaseURIBaseURI
AttributeAttribute numnum http://server/mydata.xml
文档Document #document#document http://server/mydata.xml
DocumentTypeDocumentType itemitem http://server/mydata.xml
实体Entity xyzxyz http://server/mydata.xml
元素Element itemitem http://server/mydata.xml
EntityReferenceEntityReference xyzxyz http://server/mydata.xml
元素Element 测试test http://server/a/b.xml
文本Text #text#text http://server/a/b.xml

BaseURI 查找实体引用边界,因此,如果实体处于展开状态,则不会保留此信息,并且此属性将返回 XmlDocument 对象在所有情况下的位置。BaseURI looks for entity reference boundaries, so if entities are expanded, this information is not preserved and this property returns the location of the XmlDocument object in all cases.

作为第二个示例,提供了以下 XML 文档:As a second example, given the following XML document:

<!DOCTYPE Mydata SYSTEM "http://localhost/doctype.dtd">  
<baa>&xyz;</baa>  

其中,文档类型定义 (DTD) 文件包含以下内容:where the document type definition (DTD) file contains the following:

<!ENTITY xyz "<E1>My Data</E1>">  
<!ELEMENT baa #PCDATA>  
<!ATTLIST baa attr1 "woof">  

如果从加载 XML 文档 http://localhost/mydata.xml , BaseURI 则将为每个节点返回以下内容:If the XML document is loaded from http://localhost/mydata.xml, BaseURI returns the following for each of the nodes:

NodeTypeNodeType 名称Name BaseURIBaseURI
文档Document #document#document http://localhost/mydata.xml
DocumentTypeDocumentType MydataMydata http://localhost/doctype.dtd
元素Element baabaa http://localhost/mydata.xml
实体Entity xyzxyz http://localhost/doctype.dtd
EntityReferenceEntityReference xyzxyz http://localhost/mydata.xml
AttributeAttribute woofwoof http://localhost/mydata.xml

备注

默认属性的基本 URI 与它们所属的元素的基 URI 相同。The base URI of a default attribute is the same as the base URI of the element to which they belong.

此属性是文档对象模型 (DOM) 的 Microsoft 扩展。This property is a Microsoft extension to the Document Object Model (DOM).

适用于