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Parsing XML into a list

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-06 09:20:40
Bernd Linde

As specified in the comments section, an alternative to Mihai's solution of using LINQ to XML, you can also use a pre-defined class structure to deserialize your XML into typed classes and properties.

The benefit of this is that you will then have an object that is a representation of your XML (well hopefully) and allow you to more easily work with the data that was inside the XML

With the supplied XML sample and using the Edit -> Paste Special -> Paste XML as Classes menu option in Visual Studio, you will get a class structure similar to the one below (this one has been refined a bit for easier reading)

using System.Xml.Serialization;

[XmlTypeAttribute(AnonymousType = true)]
[XmlRootAttribute(Namespace = "", IsNullable = false)]
public partial class Codes
{
  [XmlElementAttribute("CustomFieldValueSet")]
  public List<CodesCustomFieldValueSet> CustomFieldValueSet { get; set; }
}

[XmlTypeAttribute(AnonymousType = true)]
public partial class CodesCustomFieldValueSet
{
  [XmlElementAttribute("CustomFieldValue")]
  public List<CodesCustomFieldValueSetCustomFieldValue> CustomFieldValue { get; set; }

  [XmlAttributeAttribute(AttributeName="name")]
  public string Name { get; set; }

  [XmlAttributeAttribute(AttributeName = "label")]
  public string Label { get; set; }

  [XmlAttributeAttribute(AttributeName = "distributionType")]
  public string DistributionType { get; set; }
}

[XmlTypeAttribute(AnonymousType = true)]
public partial class CodesCustomFieldValueSetCustomFieldValue
{
  public string Value { get; set; }

  public string Description { get; set; }

  [XmlAttributeAttribute(AttributeName = "distributionValue")]
  public decimal DistributionValue { get; set; }

  [XmlAttributeAttribute(AttributeName = "splitindex")]
  public byte SplitIndex { get; set; }
}

With this class structure, you are then able to deserialize your XML with the below lines
(where txtInput.Text is a TextBox I used to hold the sample XML data)

XmlSerializer serializer = new XmlSerializer(typeof(Codes));
Codes codesInput = serializer.Deserialize(new StringReader(txtInput.Text)) as Codes;

if (codesInput != null)
{
  // Do something with the data
}

NOTE:
From your desired output and the structure of the sample XML you supplied, there will be a requirement for you to transform the information in the deserialized object into what/how you want it, for that I would recommend creating an additional class structure, combined with a List<T>, to hold all the information as shown in your desired output.

Even better would be if you controlled the XML's structure and could structure it in a better way as to make it more self explanatory than what it currently is, as it seems that the links between each CustomFieldValueSet is the splitindex, which is an attribute of the child nodes, which complicates it a lot.

Further reading on XML Serialization:
MSDN: Introducing XML Serialization
The XmlSerializer Class

You can use Linq to XML for this.

using System.Xml;
using System.Xml.Linq;

static void Main(string[] args) {

// This txt file contains your xml.
var xml_sample = File.ReadAllText("xml_sample.txt");
var doc = XDocument.Parse(xml_sample);

// Get all <CustomFieldValueSet> that have the label attribute `Account`
var accounts = from item in doc.Descendants("Codes").Descendants("CustomFieldValueSet")
               where (item.HasAttributes) && 
                     (item.Attribute("label").Value == "Account")
               select item;

// Create an anonymous type containing the value of the 
// distributionValue attribute and the <Value> node.
var accountValue = from el in accounts.Descendants("CustomFieldValue")
                   let distAttribute = el.Attribute("distributionValue")
                   select new
                   {
                       distValue = distAttribute != null ? distAttribute.Value : "0",
                       value = el.Descendants("Value").First().Value,
                   };

// Display stuff here just to make sure we got it right.
accounts.ToList().ForEach(el => 
    Console.WriteLine(el.Name + " " + el.Attribute("distributionType").Value));

accountValue.ToList().ForEach(el => 
    Console.WriteLine(el.distValue + ":"+ el.value));
}

You should be able to use these ideas to parse your XML file as needed.

标签
c#
xml-parsing
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