检索 XML 部件 uing Linq to XML
本文关键字:XML to Linq 部件 检索 uing | 更新日期: 2023-09-27 18:34:51
下面的XML片段是更大的XML的一部分。我一遍又一遍地尝试获取地址行 1、2、3 以及城市和州、邮政编码和国家/地区。我想将其功能化,以便我可以挑选 那些基于InvoiceHeader id="XXXX"的地址,但是我总是碰壁。我已经尝试了下面的查询或类似的查询,但我不断收到未设置为对象实例的错误对象引用。
这是我的问题,有人可以指出我明显的错误。
IEnumerable<string> partNos =
from item in PurchaseOrderXml.Descendants("RemitTo").Descendants("Address")
where (string)item.Attribute("id").Value == "23951768"
select (string)item;
<Invoice>
<InvoiceHeader id="23951768" status="InProcess">
<InvoiceName />
<InvoiceNumber>23951768</InvoiceNumber>
<InvoiceDate>2014-09-26 00:00:00.0</InvoiceDate>
<DueDate>2014-10-26 00:00:00.0</DueDate>
<SupplierInvoiceNo>534254504</SupplierInvoiceNo>
<InvoiceType>Invoice</InvoiceType>
<Supplier id="3825405">
<ContactInfo type="main">
<Address>
<AddressLine lineNumber="1">Post </AddressLine>
<AddressLine lineNumber="2">30 Street</AddressLine>
<AddressLine lineNumber="3">30 Street</AddressLine>
<City>Saint Louis</City>
<State>MO</State>
<PostalCode>63103-2530</PostalCode>
<Country isoCountryCode="US">United States</Country>
</Address>
</ContactInfo>
</Supplier>
<BillTo>
<Address>
<AddressLine lineNumber="1">vvvv</AddressLine>
<AddressLine lineNumber="2">vvvv</AddressLine>
<City>Philadelphia</City>
<State>PA</State>
<PostalCode>19222</PostalCode>
<Country isoCountryCode="US">United States</Country>
</Address>
</BillTo>
<RemitTo>
<Address>
<AddressLine lineNumber="1">P O BOX 535182</AddressLine>
<AddressLine lineNumber="2" />
<AddressLine lineNumber="3" />
<City>ATLANTA</City>
<State>GA</State>
<PostalCode>303535182</PostalCode>
<Country isoCountryCode="US">United States</Country>
</Address>
</RemitTo>
</InvoiceHeader>
</Invoice>
您的商品范围变量对应于没有 id 属性的 Address 元素。相反,您需要一个查询,该查询首先查找(或筛选(相应的 InvoiceHeader,然后查找匹配的 InvoiceHead 的地址元素结尾。
下面是查找 InvoiceHead 的示例:
var Header = PurchaseOrderXml.Descendants("InvoiceHeader")
.FirstOrDefault(header => (string)header.Attribute("id").Value == headerId);
您可以检查是否找到标头(Header != null
(。 拥有标头后,在该给定元素的范围内执行任何需要的操作。例:
var RemitToAddress = Header.Descendants("RemitTo").Descendants("Address").FirstOrDefault();
您可能想要检查标头中的其他元素,因此将查询拆分为这样的部分可以使您的意图清晰。
另请注意,我使用了Descendants
,但如果它与您的架构更匹配,您也可以使用 Elements
。
另一个示例,要获取AddressLine
元素并将它们连接起来,您可以尝试如下方法:
IEnumerable<string> AddressLines = RemitToAddress.Elements("AddressLine")
.OrderBy(line => (int)line.Attribute("lineNumber"))
.Select(line => line.Value);
var AddressText = string.Join("'n", AddressLines);
试试这个:-
var result = xdoc.Root.Descendants("InvoiceHeader")
.Where(x => x.Attribute("id").Value == "23951768")
.SelectMany(x => x.Descendants("Address"))
.Select(x =>
{
{
var addressLine1 = x.Elements("AddressLine")
.FirstOrDefault(z => z.Attribute("lineNumber").Value == "1");
var addressLine2 = x.Elements("AddressLine")
.FirstOrDefault(z => z.Attribute("lineNumber").Value == "2");
var addressLine3 = x.Elements("AddressLine")
.FirstOrDefault(z => z.Attribute("lineNumber").Value == "3");
return new
{
AddressLine1 = addressLine1 != null ? addressLine1.Value : String.Empty,
AddressLine2 = addressLine2 != null ? addressLine1.Value : String.Empty,
AddressLine3 = addressLine3 != null ? addressLine1.Value : String.Empty,
City = x.Element("City").Value,
State = x.Element("State").Value
PostalCode = x.Element("PostalCode").Value,
Country= x.Element("Country").Value,
};
}
});