C# 我已经搜索过了,但似乎无法根据c中同级xml元素的属性获取xml元素的属性
以下是我的示例xml:C# 我已经搜索过了,但似乎无法根据c中同级xml元素的属性获取xml元素的属性,c#,xml,xpath,xelement,C#,Xml,Xpath,Xelement,以下是我的示例xml: <customers group="A"> <customer ID="1234" phone="555-555-0123" name="Golf Clubs International"> <services> <service type="Golf" premise="89645" priority="0" /> </services> <customFields
<customers group="A">
<customer ID="1234" phone="555-555-0123" name="Golf Clubs International">
<services>
<service type="Golf" premise="89645" priority="0" />
</services>
<customFields>
<customField key="address" value="5431 E Golf Way, Altanta, GA, 31111" />
<customField key="connection" value="CONNECTED" />
</customFields>
</customer>
我需要返回customField地址值,其中服务等于89645。我使用XElement尝试了几种不同的方法,但没有一种方法可以过滤我需要的内容,即使在我将其过滤时,我也不知道如何重新导航以获得同级元素的属性。下面是一些我试图为premise属性过滤的内容。我已经使用这个网站好几年了,这是我第一次被难倒而发帖
IEnumerable<XElement> tests =
from el in cust.Elements("services")
where (string)el.Elements("service").Attributes("premise").ToString() == ID
select el;
var y = cust.Element("customers")
.Elements("services")
.Where(b => b.Element("service").Value == ID)
.SingleOrDefault();
var x = from a in cust.Elements("service")
where a.Attribute("premise").Value == ID
select cust.Elements("customfields").Elements("customfield").Attributes("key");
在这种情况下我喜欢用字典。见下面的代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication58
{
class Program
{
const string FILENAME = @"C:\TEMP\TEST.XML";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
var query = doc.Descendants("customer").Select(x => new{
premise = (string)x.Descendants("service").FirstOrDefault().Attribute("premise"),
customFields = x.Descendants("customField").GroupBy(y => (string)y.Attribute("key"), z => (string)z.Attribute("value"))
.ToDictionary(y => y.Key, z => z.FirstOrDefault())
}).ToList();
var results = query.Where(x => x.premise == "89645").FirstOrDefault();
}
}
}
这里有一个单语句解决方案
XDocument doc=XDocument.LoadFILENAME
var query = doc.Descendants("customer").Select(x => new {
premise = (string)x.Descendants("service").FirstOrDefault().Attribute("premise"),
customFields = x.Descendants("customField").GroupBy(y => (string)y.Attribute("key"), z => (string)z.Attribute("value"))
.ToDictionary(y => y.Key, z => z.FirstOrDefault())
}).Where(x => x.premise == "89645")
.FirstOrDefault();
对于可能会发现这一点的VB用户 首先是一些样本数据
Dim xe As XElement
xe = <customers group="A">
<customer ID="1234" phone="555-555-0123" name="Golf Clubs International">
<services>
<service type="Golf" premise="89645" priority="0"/>
</services>
<customFields>
<customField key="address" value="5431 E Golf Way, Altanta, GA, 31111"/>
<customField key="connection" value="CONNECTED"/>
</customFields>
</customer>
<customer ID="567" phone="555-555-0123" name="Golf Clubs International">
<services>
<service type="Golf" premise="54698" priority="0"/>
</services>
<customFields>
<customField key="address" value="5431 E Golf Way, Altanta, GA, 31111"/>
<customField key="connection" value="CONNECTED"/>
</customFields>
</customer>
<customer ID="890" phone="555-555-0123" name="Golf Clubs International">
<services>
<service type="Golf" premise="89645" priority="0"/>
</services>
<customFields>
<customField key="address" value="718 W. High, Jefferson City, MO 65101"/>
<customField key="connection" value="CONNECTED"/>
</customFields>
</customer>
</customers>
然后是获取地址的步骤
Dim rslts As IEnumerable(Of XElement)
'first get service equals 89645, using above there are two
rslts = From el In xe...<service>
Where el.@premise = "89645"
Select el
'for each of those find the address
For Each rel As XElement In rslts
Dim ie As IEnumerable(Of XElement)
ie = rel.Parent.Parent.<customFields>.<customField>.Where(Function(cfel)
Return cfel.@key = "address"
End Function)
For Each a As XElement In ie
Debug.WriteLine(a.@value)
Next
Next
查询可以缩短,但这段代码是为了说明发生了什么。这非常有效,非常感谢。不过很好奇,如果查询全部在一个语句中,您将如何调试它呢?我添加了一个单语句解决方案。我想如果我把解决方案分为两部分,会更容易理解。这两部分帮助很大,我也很感谢你把这一句话也发出来。