What is the best way to read an attribute from an xml string in c#
I have the following xml as string:
<cfdi:Comprobante version="3.0"
xsi:schemaLocation="http://www.sat.gob.mx/cfd/3 http://www.sat.gob.mx/sitio_internet/cfd/3/cfdv3.xsd"
serie="A"
folio="6"
fecha="2011-07-22T13:51:42"
formaDePago="Pago en una sola exhibición"
sello="XlSJYAxauwYbI"
noCertificado="00001000000101242210"
certificado="YtEQOHw02OGx6E="
condicionesDePago="Paguese a mas tardar el 21/08/2011."
subTotal="123"
Moneda="MXN"
total="123"
tipoDeComprobante="ingreso">
<cfdi:Complemento>
<tfd:TimbreFiscalDigital FechaTimbrado="2011-07-22T13:51:47"
UUID="41C8A54F-4956-1BAD-F2CB-48E8343918FD"
noCertificadoSAT="00001000000102616613"
selloCFD="wrwerewe"
version="1.0"
xsi:schemaLocation="http://www.sat.gob.mx/TimbreFiscalDigital http://www.sat.gob.mx/sitio_internet/timbrefiscaldigital/TimbreFiscalDigital.xsd"/>
</cfdi:Complemento>
</cfdi:Comprobante>
I want to read the attribute UUID inside the node tfd:TimbreFiscalDigital so I was wondering how to do this using c#, this might be silly but please understand I'm new in c#.
Note: This xml is inside a string, not in a file (our provider's webservice returns the xml as string, is not our fault)
Note2: I can use Linq, or any other library, that's not a prob
Thanks!!
Because you have namespace prefixes, you'll have to use XNamespace instances to help you reference the elements.
// We use these to establish our namespace prefixes
XNamespace cfdi = @"http://www.sat.gob.mx/cfd/3";
XNamespace tfd = @"http://www.sat.gob.mx/TimbreFiscalDigital";
var xdoc = XDocument.Parse(xml);
// Walk down the XML tree to tfd:TimbreFiscalDigital
var elt = xdoc.Element(cfdi + "Comprobante")
.Element(cfdi + "Complemento")
.Element(tfd + "TimbreFiscalDigital");
// Alternately
// var elt = xdoc.Descendants(tfd + "TimbreFiscalDigital")
// .First();
var uuid = (string)elt.Attribute("UUID");
// You can convert attributes and element values to lots of built-in types
// See the Explicit Conversions for XAttribute and XElement on MSDN
var date = (DateTime)elt.Attribute("FechaTimbrado");
Further reading:
I wrapped this in a root node declaring the namespaces. I'm also using XPath to query for the node.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.Xml.XPath;
using System.Xml;
class Program
{
static void Main(string[] args)
{
var doc = @"
<Root xmlns:xsi='http://someuri' xmlns:cfdi='http://someuri2' xmlns:tfd='http://someuri3'>
<cfdi:Comprobante version='3.0'
xsi:schemaLocation='http://www.sat.gob.mx/cfd/3 http://www.sat.gob.mx/sitio_internet/cfd/3/cfdv3.xsd'
serie='A'
folio='6'
fecha='2011-07-22T13:51:42'
formaDePago='Pago en una sola exhibición'
sello='XlSJYAxauwYbI'
noCertificado='00001000000101242210'
certificado='YtEQOHw02OGx6E='
condicionesDePago='Paguese a mas tardar el 21/08/2011.'
subTotal='123'
Moneda='MXN'
total='123'
tipoDeComprobante='ingreso'>
<cfdi:Complemento>
<tfd:TimbreFiscalDigital FechaTimbrado='2011-07-22T13:51:47'
UUID='41C8A54F-4956-1BAD-F2CB-48E8343918FD'
noCertificadoSAT='00001000000102616613'
selloCFD='wrwerewe'
version='1.0'
xsi:schemaLocation='http://www.sat.gob.mx/TimbreFiscalDigital http://www.sat.gob.mx/sitio_internet/timbrefiscaldigital/TimbreFiscalDigital.xsd'/>
</cfdi:Complemento>
</cfdi:Comprobante>
</Root>";
var uuid = XDocument.Parse(doc)
var uuid = XDocument.Parse(doc)
.XPathSelectElement("//*[local-name() = 'TimbreFiscalDigital']")
.Attribute("UUID").Value;
// Work with uuid
Console.Read();
}
}
我发现linq的XDocument和相关类特别简单易用：
string uuid = XDocument.Parse(xmlString)
.Descendants("TimbreFiscalDigital")
.Attributes("UUID")
.First()
.Value;