.net - 是什么决定了 WCF WSDL 中 XML 属性的顺序？

Question

之前也有人问过类似的问题，我的理解是XML或者schema中不能指​​定XML属性的顺序。但是，我想知道，WSDL 中的 XML 属性的顺序是由 WCF 随机生成的还是遵循某些规则。

例如，在某个阶段，我们在生成的 WSDL 中有以下(部分)XML 标记。

<xs:element maxOccurs="unbounded" minOccurs="0"

现在再次生成它就变成了

<xs:element minOccurs="0" maxOccurs="unbounded"

交换了最小值和最大值的顺序。

另一个例子:

<wsdl:port binding="tns:BasicHttpBinding_IReferenceDataBusinessService" name="BasicHttpBinding_IReferenceDataBusinessService">

成为

<wsdl:port name="BasicHttpBinding_IReferenceDataBusinessService" binding="tns:BasicHttpBinding_IReferenceDataBusinessService">

只是想知道是什么决定了 WCF 中的此类订单？是否可以调整流程以保持相同的顺序，从而更轻松地比较两个 WSDL 文件？

谢谢。

Answer 1

您承认属性顺序无关紧要，然后继续暗示您无论如何都希望按照属性顺序行事。根据定义，它是一个实现细节。依赖任何给定的属性排序，后果自负。

此外，属性顺序只是按词法比较 XML 文档的众多障碍之一。在开始这样的努力之前，请熟悉 Canonical XML Version 1.1 涵盖的所有内容。 .总结如下:

The canonical form of an XML document is physical representation of the document produced by the method described in this specification. The changes are summarized in the following list:

• The document is encoded in UTF-8
• Line breaks normalized to #xA on input, before parsing
• Attribute values are normalized, as if by a validating processor
• Character and parsed entity references are replaced
• CDATA sections are replaced with their character content
• The XML declaration and document type declaration are removed
• Empty elements are converted to start-end tag pairs
• Whitespace outside of the document element and within start and end tags is normalized
• All whitespace in character content is retained (excluding characters removed during line feed normalization)
• Attribute value delimiters are set to quotation marks (double quotes)
• Special characters in attribute values and character content are replaced by character references
• Superfluous namespace declarations are removed from each element
• Default attributes are added to each element
• Fixup of xml:base attributes [C14N-Issues] is performed
• Lexicographic order is imposed on the namespace declarations and attributes of each element

健壮的代码不依赖于实现在任何这些维度上的意外(非必要)属性。