问题
I want to get the value from XML file but I failed. Can you please help me point out the problem ?? Because I already tried very hard to test and googling but I still can't spot the problem.
XML :
<?xml version="1.0" encoding="utf-8" ?>
<Contacts>
- <Contact>
<ID>xxx</ID>
<AutoUpdateEnabled>false</AutoUpdateEnabled>
<LastChanged>2013-05-29T01:53:59.4470000Z</LastChanged>
- <Profiles>
- <Personal>
<FirstName>My First Name</FirstName>
<LastName>My Last Name</LastName>
<UniqueName>My Unique Name</UniqueName>
<SortName></SortName>
<DisplayName>My Display Name</DisplayName>
</Personal>
</Profiles>
- <Phones>
- <Phone>
<ID>3</ID>
<PhoneType>Mobile</PhoneType>
<Number>000-0000000</Number>
<IsIMEnabled>false</IsIMEnabled>
<IsDefault>false</IsDefault>
</Phone>
</Phones>
- <Locations>
- <Location>
<ID>2</ID>
<LocationType>Business</LocationType>
<CompanyName></CompanyName>
<IsDefault>false</IsDefault>
</Location>
</Locations>
</Contact>
- <Contact>
<ID>xxx</ID>
<AutoUpdateEnabled>false</AutoUpdateEnabled>
<LastChanged>2013-05-29T01:53:25.2670000Z</LastChanged>
- <Profiles>
- <Personal>
<FirstName>Person</FirstName>
<LastName>Two</LastName>
<UniqueName></UniqueName>
<SortName></SortName>
<DisplayName>Person Two</DisplayName>
</Personal>
</Profiles>
- <Emails>
- <Email>
<ID>1</ID>
<EmailType>Personal</EmailType>
<Address>MyTest@gmail.com</Address>
<IsIMEnabled>false</IsIMEnabled>
<IsDefault>true</IsDefault>
</Email>
</Emails>
- <Locations>
- <Location>
<ID>2</ID>
<LocationType>Business</LocationType>
<CompanyName>Testing Company</CompanyName>
<IsDefault>false</IsDefault>
</Location>
</Locations>
</Contact>
</Contacts>
My Sample Code :
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml("TheXMLFile.xml");
xmldoc.DocumentElement.SelectNodes("contact") // return 0 counts
xmldoc.DocumentElement.SelectNodes("/contact") // return 0 counts
xmldoc.DocumentElement.SelectNodes("/contact") // return 0 counts
xmldoc.DocumentElement.SelectNodes("/contacts/contact") // return 0 counts
xmldoc.DocumentElement.SelectNodes("*") // return 2 counts !this works
XmlNodeList elemList = xmldoc.DocumentElement.GetElementsByTagName("contact"); // return 2 counts !this also works
foreach (XmlNode node in elemList)
{
node.SelectSingleNode("Profiles") //return ""
node.SelectSingleNode("/Profiles") //return ""
node.SelectSingleNode("//Profiles") //return ""
node.SelectSingleNode(".//Profiles") //return ""
}
I just want to get "FirstName, LastName, Email Address", the SelectNodes
function just not working like expected... No clue at all ... please help. Thanks in advance
回答1:
You need something like this:
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(@"D:\temp\contacts.xml"); // use the .Load() method - not .LoadXml() !!
// get a list of all <Contact> nodes
XmlNodeList listOfContacts = xmldoc.SelectNodes("/Contacts/Contact");
// iterate over the <Contact> nodes
foreach (XmlNode singleContact in listOfContacts)
{
// get the Profiles/Personal subnode
XmlNode personalNode = singleContact.SelectSingleNode("Profiles/Personal");
// get the values from the <Personal> node
if (personalNode != null)
{
string firstName = personalNode.SelectSingleNode("FirstName").InnerText;
string lastName = personalNode.SelectSingleNode("LastName").InnerText;
}
// get the <Email> nodes
XmlNodeList emailNodes = singleContact.SelectNodes("Emails/Email");
foreach (XmlNode emailNode in emailNodes)
{
string emailTyp = emailNode.SelectSingleNode("EmailType").InnerText;
string emailAddress = emailNode.SelectSingleNode("Address").InnerText;
}
}
With this approach, you should be able to read all the data you need properly.
回答2:
The XML tags are case dependent so contact != Contact.
Change this for a start.
回答3:
The issue is that SelectNodes method takes a XPath expression that is case sensitive.
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load("TheXMLFile.xml");
Console.WriteLine($"Contact: {xmldoc.DocumentElement.SelectNodes("Contact").Count}"); // return 2
Console.WriteLine($"/Contact: {xmldoc.DocumentElement.SelectNodes("/Contact").Count}"); // return 0, and it is the expected!
Console.WriteLine($"//Contact: {xmldoc.DocumentElement.SelectNodes("//Contact").Count}"); // return 2
foreach (XmlNode firstName in xmldoc.DocumentElement.SelectNodes("//Profiles/Personal/FirstName"))
{
Console.WriteLine($"firstName {firstName.InnerText}");
}
In the code above you can see 2 first names, "My First Name" and "Person". I just change the first char to upper case "contact" -> "Contact".
来源:https://stackoverflow.com/questions/16889895/c-sharp-xmldocument-selectnodes-is-not-working