Linq to Xml selecting elements

Linq to Xml selecting elements - c#

I have this xml file:
<?xml version="1.0" encoding="utf-8" ?>
<Calendar>
<item id="34">
<Date>26 Apr</Date>
<Name>aa</Name>
<Date>26 Apr</Date>
<Name>aaa</Name>
<Date>23 Apr</Date>
<Name>aaaa</Name>
<Date>23 Apr</Date>
<Name>aaaaa</Name>
</item>
<item id="35">
<Date>27 Apr</Date>
<Name>aa</Name>
<Date>27 Apr</Date>
<Name>aaa</Name>
<Date>27 Apr</Date>
<Name>aaaa</Name>
<Date>27 Apr</Date>
<Name>aaaaa</Name>
</item>
</Calendar>
this is my class
public class Calendar
{
public string Name{ get; set; }
public string Data { get; set; }
}
listBox.ItemsSource =
from var in xml.Descendants("item")
orderby Convert.ToInt32(var.Attribute("id").Value) ascending
select new Calendar
{
Name= var.Element("Name").Value,
Data = var.Element("Data ").Value,
};
but in listBox i have only the first date and name of every item

class Program
{
static void Main(string[] args)
{
XDocument xml =
XDocument.Load(
#"Path to your xml");
var q = from x in xml.Descendants("item")
orderby Convert.ToInt32(x.Attribute("id").Value) ascending
select new Calendar
{
Name = x.Elements("Name").Select(a => a.Value).ToList<String>(),
Date = x.Elements("Date").Select(a => a.Value).ToList<String>()
};
List<Calendar> calendars = q.ToList<Calendar>();
}
public class Calendar
{
public List<String> Name { get; set; }
public List<String> Date { get; set; }
}
}

XElement.Element(elementName) only gets the first element that matches the elementName. Try a different approach using XElement.Elements(elementName)

Related

How to parse xml with LINQ to an Object with XDocument

I have an xml file as below:
<Message xsi:schemaLocation ="..">
<Header>..</Header>
<Body>
<History
xmlns="..">
<Number></Number>
<Name></Name>
<Item>
<CreateDate>..</CreateDate>
<Type>..</Type>
<Description></Description>
</Item>
<Item>
<CreateDate>..</CreateDate>
<Type>..</Type>
<Description>1..</Description>
<Description>2..</Description>
</Item>
</History>
</Body>
</Message>
I would like to create and object from this as History object.
public class History
{
public string Name { get; set; }
public string Number { get; set; }
public List<Item> Items { get; set; }
}
var xElement = XDocument.Parse(xmlString);
XElement body = (XElement)xElement.Root.LastNode;
XElement historyElement = (XElement)body.LastNode;
var history = new History
{
Name = (string)historyElement.Element("Name"),
Number = (string)historyElement.Element("Number"),
Items = (
from e in historyElement.Elements("Item")
select new Item
{
CraeteDate = DateTime.Parse(e.Element("CreateDate").Value),
Type = (string)e.Element("Type").Value,
Description = string.Join(",",
from p in e.Elements("Description") select (string)p.Element("Description"))
}).ToList()
};
Why this does not work?
The values are always null.
It seems that "historyElement.Element("Name")" is always null even there is an element and value for the element.
Any idea what am I missing?
Thanks

It's due to the namespace, try doing this:
XNamespace ns = "http://schemas.microsoft.com/search/local/ws/rest/v1";// the namespace you have in the history element
var xElement = XDocument.Parse(xmlString);
var history= xElement.Descendants(ns+"History")
.Select(historyElement=>new History{ Name = (string)historyElement.Element(ns+"Name"),
Number = (string)historyElement.Element(ns+"Number"),
Items = (from e in historyElement.Elements(ns+"Item")
select new Item
{
CraeteDate= DateTime.Parse(e.Element(ns+"CreateDate").Value),
Type = (string) e.Element(ns+"Type").Value,
Description= string.Join(",",
from p in e.Elements(ns+"Description") select (string)p)
}).ToList()
}).FirstOrDefault();
If you want to read more about this subject, take a look this link

A couple of minor things here, the xml was malformed here. So had to take a while to test and make it work.
You have an xsi in the front which I assume should be somewhere mentioned in the xsd.
Turns out you have to append the namespace if your xml node has a namespace attached to it as you are parsing the xml tree here:
My sample solution looked like this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
namespace ConsoleApplication1
{
public class History
{
public string Name { get; set; }
public string Number { get; set; }
public List<Item> Items { get; set; }
}
public class Item
{
public DateTime? CreateDate { get; set; }
public string Type { get; set; }
public string Description { get; set; }
}
class Program
{
static void Main(string[] args)
{
string xmlString =
#"<Message>
<Header>..</Header>
<Body>
<History
xmlns=""http://schemas.somewhere.com/types/history"">
<Number>12</Number>
<Name>History Name</Name>
<Item>
<CreateDate></CreateDate>
<Type>Item 1 Type</Type>
<Description>Item 1 Description</Description>
</Item>
<Item>
<CreateDate></CreateDate>
<Type>Item 2 Type</Type>
<Description>Item 2 Description 1</Description>
<Description>Item 2 Description 2</Description>
</Item>
</History>
</Body>
</Message>";
XNamespace ns = "http://schemas.somewhere.com/types/history";
var xElement = XDocument.Parse(xmlString);
var historyObject = xElement.Descendants(ns +"History")
.Select(historyElement => new History
{
Name = historyElement.Element(ns + "Name")?.Value,
Number = historyElement.Element(ns + "Number")?.Value,
Items = historyElement.Elements(ns + "Item").Select(x => new Item()
{
CreateDate = DateTime.Parse(x.Element(ns + "CreateDate")?.Value),
Type = x.Element(ns + "Type")?.Value,
Description = string.Join(",", x.Elements(ns + "Description").Select(elem=>elem.Value))
}).ToList()
}).FirstOrDefault();
}
}
}
If you dont wan't to care about finding the namespace, you might want to try the following:
var document = XDocument.Parse(xmlString);
var historyObject2 = document.Root.Descendants()
.Where(x=>x.Name.LocalName == "History")
.Select(historyElement => new History
{
Name = historyElement.Element(historyElement.Name.Namespace + "Name")?.Value,
Number = historyElement.Element(historyElement.Name.Namespace+ "Number")?.Value,
Items = historyElement.Elements(historyElement.Name.Namespace + "Item").Select(x => new Item()
{
//CreateDate = DateTime.Parse(x.Element("CreateDate")?.Value),
Type = x.Element(historyElement.Name.Namespace + "Type")?.Value,
Description = string.Join(",", x.Elements(historyElement.Name.Namespace + "Description").Select(elem => elem.Value))
}).ToList()
}).FirstOrDefault();

Serialize object to specific format, remove namespaces and move attribute

I'm trying to build serialization for my application that must export data in specific format, below is sample what is expected:
<?xml version="1.0" encoding="utf-8"?>
<sync>
<table name="Test" diff="0" mode="db">
<keys>
<key>MY_NUMBER</key>
<key>ID</key>
</keys>
<items task="modify">
<item ID="OK" MY_NUMBER="two"/>
<item ID="NT" MY_NUMBER="two"/>
</items>
</table>
<table name="Second" diff="1" mode="x">
<keys>
<key>ID</key>
</keys>
<items task="add">
<item ID="x" TYPE="c"/>
</items>
</table>
</sync>
I was able to get similar results:
<?xml version="1.0" encoding="utf-8"?>
<sync>
<table name="Test" diff="0" mode="db" task="modify">
<keys>
<key>MY_NUMBER</key>
<key>ID</key>
</keys>
<items>
<item d4p1:type="FirstItem" ID="OK" MY_NUMBER="two" xmlns:d4p1="http://www.w3.org/2001/XMLSchema-instance" />
<item d4p1:type="FirstItem" ID="NT" MY_NUMBER="two" xmlns:d4p1="http://www.w3.org/2001/XMLSchema-instance" />
</items>
</table>
<table name="SecondTest" diff="1" mode="x" task="add">
<keys>
<key>ID</key>
</keys>
<items>
<item d4p1:type="SecondItem" ID="x" TYPE="c" xmlns:d4p1="http://www.w3.org/2001/XMLSchema-instance" />
</items>
</table>
</sync>
But I get unwanted namespaces, I've tried searching SO for solutions (Omitting all xsi and xsd namespaces when serializing an object in .NET?, Remove Namespaces During XML Serialization) but without luck.
I have my classes defined like this:
namespace Sync.Models
{
[XmlRoot("sync")]
[XmlInclude(typeof(FirstItem))]
[XmlInclude(typeof(SecondItem))]
public class Export
{
[XmlElement(ElementName = "table")]
public Table users { get; set; }
[XmlElement(ElementName = "table2")]
public Table items { get; set; }
}
public class Table
{
[XmlAttribute("name")]
public string name { get; set; }
[XmlAttribute("diff")]
public int diff { get; set; }
[XmlAttribute("mode")]
public string mode { get; set; }
[XmlArray("keys")]
[XmlArrayItem("key")]
public List<string> Keys { get; set; }
[XmlArray("items")]
[XmlArrayItem("item")]
public List<BaseItem> Items { get; set; }
[XmlAttribute("task")]
public string Task { get; set; }
}
public class FirstItem:BaseItem
{
[XmlAttribute("MY_NUMBER")]
public string Number { get; set; }
}
public class SecondItem:BaseItem
{
[XmlAttribute("TYPE")]
public string Type { get; set; }
}
}
And finally my serialization functionality:
var testData = new Export
{
users = new Table
{
name = "Test",
diff = 0,
mode = "db",
Keys = new List<string> { "MY_NUMBER", "ID" },
Items = new List<BaseItem>
{
new FirstItem {Id = "OK", Number = "two"},
new FirstItem {Id = "NT", Number = "two"}
},
Task = "modify"
},
items = new Table
{
name = "SecondTest",
diff = 1,
mode = "x",
Keys = new List<string> { "ID" },
Items = new List<BaseItem>
{
new SecondItem{Id = "x",Type = "c"}
},
Task = "add"
}
};
var fileName_tmp = String.Format(#"{0}\xml1.xml", Application.StartupPath);
var fileName = String.Format(#"{0}\xml.xml", Application.StartupPath);
var serializer = new XmlSerializer(typeof(Export));
using (TextWriter writer = new StreamWriter(fileName_tmp))
{
serializer.Serialize(writer, testData, new XmlSerializerNamespaces(new[] {XmlQualifiedName.Empty}));
}
using (FileStream inputStream = File.OpenRead(fileName_tmp))
{
using (StreamReader inputReader = new StreamReader(inputStream))
{
using (StreamWriter outputWriter = File.CreateText(fileName))
{
string tempLineValue;
while (null != (tempLineValue = inputReader.ReadLine()))
{
outputWriter.WriteLine(tempLineValue.Replace("table2", "table"));
}
}
}
}
1. I would like to remove unwanted namespaces and type attribute from nodes, but as I wrote before solution I found isn't working.
2. I need to have multiple nodes with same name (table), for now my only solution is to replace tag after serialization. I know I could use List to store tables, but during serialization this is giving me one extra unwanted level-can this be removed? Or custom serialization is only option?
3. Right now Task property from table is stored as attribute of table node in xml. Can I move it to items, to get desired result? Or do I must create custom serialization?

you can remove namesapces by add this code
using (FileStream stream = new FileStream("FilePath",FileMode.Create))
{
XmlSerializer serializer = new XmlSerializer(typeof(YourClass));
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", "");
serializer.Serialize(stream," Your Object to Serialize",ns);
}

Extracting detail records of XML via C# LINQ

I have the following XML excerpt. I have no problem extracting the first step of XML but I can't figure out how to get to the second layer and extract each layer. Specifically, the user info in XML below.
Any help will be appreciated...
<?xml version="1.0" encoding="UTF-8" ?>
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Body>
<ns2:getStatusReportResponse xmlns:ns2="http://xxxxxxxxx.com/">
<return>
<statusReport>
<record>
<assessorDate />
<assessorOffice />
<availableDate />
<awardDate>01/01/2014</awardDate>
<awardValue>1000000</awardValue>
<businessSector>SYSTEMS</businessSector>
<user>
<accessGrantedDate />
<emailAddress>john.usda#noemail.mil</emailAddress>
<name>JOHN USDA</name>
<phoneNumber>XXX-XXX-XXXX</phoneNumber>
<role>Focal Point</role>
</user>
<user>
<accessGrantedDate />
<emailAddress>john.usda#noemail.mil</emailAddress>
<name>JOHN USDA</name>
<phoneNumber>XXX-XXX-XXXX</phoneNumber>
<role>Focal Point</role>
</user>
</record>
</statusReport>
</return>
</ns2:getStatusReportResponse>
</S:Body>
</S:Envelope>
I've tried this but it only get's me a list of the first user record and not all of them.
var records = from x in xml.Descendants("record")
select new
{
awardDate = (string) x.Descendants("awardDate").FirstOrDefault().Value
,userList = (List<string>) x.Descendants("user").Elements() //.Elements("accessGrantedDate")
.Select(a => a.Value).ToList()
};

I am assuming this is the model of your User class:
public class User
{
public DateTime? AccessGrantedDate { get; set; }
public string EMailAddress { get; set; }
public string Name { get; set; }
public string PhoneNumber { get; set; }
public string Role { get; set; }
}
And this is extracting the User class from the XML:
var records = from x in xml.Descendants("record")
select new
{
AwardDate = (string)x.Element("awardDate"),
UserList = x.Descendants("user").Select(user => new User
{
AccessGrantedDate = string.IsNullOrEmpty((string)user.Element("accessGrantedDate")) ?
(DateTime?) null : DateTime.Parse((string)user.Element("accessGrantedDate")),
EMailAddress = (string)user.Element("emailAddress"),
Name = (string)user.Element("name"),
PhoneNumber = (string)user.Element("phoneNumber"),
Role = (string)user.Element("role")
})
};

As far as I can tell, your code gets the data of all users in the file, but only the values of nodes.
The more organized way to do this would be:
class User
{
public string accessGrantedDate { get; set; }
public string emailAddress { get; set; }
public string name { get; set; }
public string phoneNumber { get; set; }
public string role { get; set; }
}
then:
var records = from x in xml.Descendants("record")
select new
{
awardDate = (string) x.Descendants("awardDate").FirstOrDefault().Value
,userList = x.Descendants("user").Select(a=>new User
{
accessGrantedDate= a.Element("accessGrantedDate").Value,
emailAddress=a.Element("emailAddress").Value,
name=a.Element("name").Value,
phoneNumber=a.Element("phoneNumber").Value,
role = a.Element("role").Value
}).ToList()
};
or, if you don't want to organize your data this way, you may use a list of lists:
var records = from x in xml.Descendants("record")
select new
{
awardDate = (string)x.Descendants("awardDate").FirstOrDefault().Value,
userList = x.Descendants("user").Select(a => a.Elements().Select(b=>b.Value).ToList()).ToList()
};

I solved it by using a 2nd query for detail records, therefore, creating a List as a object inside the outer list.
var records = from x in xml.Descendants("record")
select new
{
awardDate = x.Element("awardDate")
,
userList = from u in x.Descendants("user")
select new
{
accessGrantedDate = (string) u.Element("accessGrantedDate")
,emailAddress =(string) u.Element("emailAddress"
,name = (string) u.Element("name")
,phoneNumber = (string) u.Element("phoneNumber")
,role = (string) u.Element("role")
}
};

Correct way to convert Xml to Objects?

I have very simple Xml structure that I want to convert to list of objects. My code does work but I think this is not the correct way of doing this and since I never did this I think there might be simpler way of doing what I want.
Xml example
<root>
<item>
<name>Item 1</name>
<price>30.00</price>
</item>
<item>
<name>Item 2</name>
<price>55.00</price>
</item>
</root>
Code to gather xml and create list of objects
class Program
{
static void Main(string[] args)
{
List<Item> itemList = new List<Item>();
var url = "http://xmlurl.com/xml";
// Load xml data
XmlDocument myXmlDocument = new XmlDocument();
myXmlDocument.Load(url);
// Select items and loop
var xmlItems = myXmlDocument.SelectNodes("/root/item");
foreach (XmlNode item in xmlItems)
{
var newItem = new Item();
foreach (XmlNode i in item)
{
// Since I cannot query them properly I need to check every item node
switch (i.Name)
{
case "name":
newItem.Name = i.InnerText;
break;
case "price":
newItem.Price = Convert.ToDecimal(i.InnerText);
break;
}
}
itemList.Add(newItem);
}
// Test it out
foreach (var item in itemList.OrderBy(x => x.Price))
{
Console.WriteLine(item.Name + " | " + item.Price);
}
Console.ReadLine();
}
}
class Item
{
public string Name { get; set; }
public decimal Price { get; set; }
}

Using LINQ:
XDocument xdoc = XDocument.Load("myXml.xml");
List<Item> items = (from item in xdoc.Descendants("item")
select new Item {
Name = item.Element("name").Value,
Price = item.Element("price").Value
}).ToList();

You should use XmlSerializer, example:
Classes:
[XmlType(TypeName="item")]
public class Item {
public string Name { get; set; }
public decimal Price { get; set; }
}
[XmlRoot(ElementName = "root")]
public class ItemList : List<Item> {
}
Getting them from markup:
const string test = #"<root>
<item>
<name>Item 1</name>
<price>30.00</price>
</item>
<item>
<name>Item 2</name>
<price>55.00</price>
</item>
</root>";
var serializer = new XmlSerializer(typeof(ItemList));
List<Item> result;
using (var reader = new StringReader(test)) {
result = (List<Item>)serializer.Deserialize(reader);
}

You can define your class:
[XmlType("item")]
public class Item
{
[XmlElement("name")]
public string Name { get; set; }
[XmlElement("price")]
public decimal Price { get; set; }
}
And then deserialize the Xml:
var xml = #"<root>
<item>
<name>Item 1</name>
<price>30.00</price>
</item>
<item>
<name>Item 2</name>
<price>55.00</price>
</item>
</root>";
List<Item> items;
var serializer = new XmlSerializer(typeof(List<Item>),
new XmlRootAttribute("root"));
using(var stream = new StringReader(xml))
{
items = (List<Item>)serializer.Deserialize(stream);
}
if(items != null)
{
foreach(var item in items)
{
Console.Write(item);
}
}

XMLSerialization for a List

I have class like this below shown. which contains the shopping items where the number can vary from 0 to n.
namespace SerializationPOC
{
public class ShoppingItems
{
public string CustomerName { get; set; }
public string Address { get; set; }
public List<Item> Items { get; set; }
}
public class Item
{
public string Name { get; set; }
public string Price { get; set; }
}
}
Is it possible to get the class serialized like to get the XML Schema like below.
<?xml version="1.0" encoding="utf-8" ?>
<ShoppingItems>
<CustomerName>John</CustomerName>
<Address>Walstreet,Newyork</Address>
<Item1>Milk</Item1>
<Price1>1$</Price1>
<Item2>IceCream</Item2>
<Price2>1$</Price2>
<Item3>Bread</Item3>
<Price3>1$</Price3>
<Item4>Egg</Item4>
<Price4>1$</Price4>
<Item..n>Egg</Item..n>
<Price..n>1$</Price..n>
</ShoppingItems>
I would like to know if this can be achieved by using the Serilization if not whats the best way to achieve this Schema?

There is no standard serializer that supports that layout. You will have to do it yourself. Personally, I would say "you're doing it wrong"; I strongly suggest (if it is possible) using a format like
<Item name="IceCream" Price="1$"/>
or
<Item><Name>IceCream</Name><Price>1$</Price></Item>
both of which would be trivial with XmlSerializer.
LINQ-to-XML is probably your best option, something like:
var items = new ShoppingItems
{
Address = "Walstreet,Newyork",
CustomerName = "John",
Items = new List<Item>
{
new Item { Name = "Milk", Price = "1$"},
new Item { Name = "IceCream", Price = "1$"},
new Item { Name = "Bread", Price = "1$"},
new Item { Name = "Egg", Price = "1$"}
}
};
var xml = new XElement("ShoppingItems",
new XElement("CustomerName", items.CustomerName),
new XElement("Address", items.Address),
items.Items.Select((item,i)=>
new[] {
new XElement("Item" + (i + 1), item.Name),
new XElement("Price" + (i + 1), item.Price)}))
.ToString();

Can you please have a look on my article, [^]
As an example you can look into the below code. The Serialize method is given on the article.
var test = new ShoppingItems()
{
CustomerName = "test",
Address = "testAddress",
Items = new List<Item>()
{
new Item(){ Name = "item1", Price = "12"},
new Item(){Name = "item2",Price = "14"}
},
};
var xmlData = Serialize(test);
And it will return the string given below,
<?xml version="1.0" encoding="utf-16"?>
<ShoppingItems xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<CustomerName>test</CustomerName>
<Address>testAddress</Address>
<Items>
<Item>
<Name>item1</Name>
<Price>12</Price>
</Item>
<Item>
<Name>item2</Name>
<Price>14</Price>
</Item>
</Items>
</ShoppingItems>

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

Linq to Xml selecting elements - c#

XElement.Element(elementName) only gets the first element that matches the elementName. Try a different approach using XElement.Elements(elementName)

Related

How to parse xml with LINQ to an Object with XDocument

Serialize object to specific format, remove namespaces and move attribute

Extracting detail records of XML via C# LINQ

Correct way to convert Xml to Objects?

XMLSerialization for a List

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