给定一个XSD文件,如下所示的代码会在返回的DataSet中的两个DataTable中生成一个额外(和不需要的)列.
ds.readxmlSchema(s);
两个DataTable都有一个Order_Id列;其他列与XSD完美匹配.
有没有人见过这个?
XSD文件如下:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="Order">
<xs:complexType>
<xs:sequence>
<xs:element name="Item" minOccurs="0" maxOccurs="unbounded">
<xs:complexType msdata:AutoIncrement="false">
<xs:attribute name="itemId" type="xs:unsignedInt" />
<xs:attribute name="stockCode" type="xs:string" />
<xs:attribute name="stockCodeType" type="xs:string" />
<xs:attribute name="Quantity" type="xs:unsignedLong" />
<xs:attribute name="ProductIdX" type="xs:unsignedInt" />
<xs:attribute name="legalEntity" type="xs:string" />
<xs:attribute name="countryOfIssue" type="xs:string" />
<xs:attribute name="branchSystem" type="xs:string" />
<xs:attribute name="accountId" type="xs:string" />
<xs:attribute name="settlementDate" type="xs:string" />
<xs:attribute name="TradeDate" type="xs:string" />
<xs:attribute name="partyCode" type="xs:string" />
<xs:attribute name="userId" type="xs:string" />
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="OrderId" type="xs:unsignedInt" />
<xs:attribute name="StrategyId" type="xs:string" />
<xs:attribute name="ActivityId" type="xs:string" />
</xs:complexType>
</xs:element>
</xs:schema>
解决方法:
你应该看看Deriving DataSet Relational Structure from XML Schema (XSD).这篇文章指出了这一点
In general, for each complexType child element of a schema element, a
table is generated in the DataSet. The table structure is determined
by the deFinition of the complex type.…
However, a table is only created for a top-level complexType element
when the complexType element is nested inside another complexType
element, in which case the nested complexType element is mapped to a
DataTable within the DataSet.
>订单
>项目
由于item complexType嵌套在Order complexType中,因此也将生成这两个表之间的关系.为了能够创建此关系,将包括新列Order_id.
编辑
请进一步查看Generating DataSet Relations for XSD.在本文中,您将找到:
The msdata:Relationship annotation allows you to explicitly specify
parent-child relationships between elements in the schema that are not
nested. The following example shows the structure of the Relationship
element.
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="Order">
... your deFinition goes here!
</xs:element>
<xs:annotation>
<xs:appinfo>
<msdata:Relationship name="OrderItemRelation"
msdata:parent="Order"
msdata:child="Item"
msdata:parentkey="OrderID"
msdata:childkey="ANY_COLUMN_IN_nesTED_COMPLEX_TYPE"/>
</xs:appinfo>
</xs:annotation>
</xs:schema>