I have some XML
<Users>
<User Name="Z"/>
<User Name="D"/>
<User Name="A"/>
</User>
I want to sort that by Name. I load that xml using XDocument. How can I view that xml sorted by Name?
You can sort using LINQ to Xml, if XmlDocument is not the case
XDocument input = XDocument.Load(#"input.xml");
XDocument output = new XDocument(
new XElement("Users",
from node in input.Root.Elements()
orderby node.Attribute("Name").Value descending
select node));
XDocument xdoc = new XDocument(
new XElement("Users",
new XElement("Name", "Z"),
new XElement("Name", "D"),
new XElement("Name", "A")));
var doc = xdoc.Element("Users").Elements("Name").OrderBy(n => n.Value);
XDocument doc2 = new XDocument(new XElement("Users", doc));
Related
I am new to C# and Linq. I am trying to write my Dictionary to file as XML. Therefore I use a foreach loop add all XElements to a root XElement. This is added to the document. But it does only add the last iteration of my loop to the document. What am I doing wrong?
Here is the code
public void ToXml(string xmlFile)
{
//Dictionary used: Values
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", null));
XElement xRoot = new XElement("RootElement");
doc.Add(xRoot);
Dictionary<double, double[]>.KeyCollection keys = Values.Keys;
foreach(double key in keys)
{
XElement inner = new XElement("InnerElement",
new XAttribute("value", key),
new XElement("TestValue1", Values[key][0]),
new XElement("Testvalue2", Values[key][1]),
new XElement("TestValue3", Values[key][2]),
new XElement("TestValue4", Values[key][3]),
new XElement("TestValue5", Values[key][4]),
new XElement("TestValue6", Values[key][5]));
xRoot.Add(inner);
}
doc.Save(xmlFile);
}
This is the output:
<?xml version="1.0" encoding="utf-8"?>
<RootElement>
<InnerElement value="400">
<TestValue1>0</TestValue1>
<Testvalue2>0</Testvalue2>
<TestValue3>200</TestValue3>
<TestValue4>0</TestValue4>
<TestValue5>100</TestValue5>
<TestValue6>491</TestValue6>
</InnerElement>
</RootElement>
My intention is to iterate through my lovely dictionary (both key and value are strings) and create an xml file from it.
I get the error on the last line (saving the xml).
"InvalidOperationException was unhandled
Token EndDocument in state Document would result in an invalid XML document."
Looking through this using breakpoints it would seem that at reaching the end of this, only the initial bit (outside the for each loop) has been done..
I'm half asking what silly mistake I've made, I'm partly asking if there's a more eloquent way of doing this.
Sorry if I've missed anything, let me know if i have, will add.
XDocument xData = new XDocument(
new XDeclaration("1.0", "utf-8", "yes"));
foreach (KeyValuePair<string, string> kvp in inputDictionary)
{
xData.Element(valuesName).Add(
new XElement(valuesName,
new XAttribute("key", kvp.Key),
new XAttribute("value", kvp.Value)));
}
xData.Save("C:\\xData.xml");
Currently you're adding multiple elements directly to the document - so you'd end up with either no root elements (if the dictionary is empty) or potentially multiple root elements (if there's more than one entry in the dictionary). You want a root element, and then your dictionary elements under that. Additionally, you're trying to find an element called valuesName without ever adding anything, so you'll actually get a NullReferenceException if there are any dictionary entries.
Fortunately, it's even easier than you've made it, because you can just use LINQ to transform your dictionary into a sequence of elements and put that in the doc.
var doc = new XDocument(
new XDeclaration("1.0", "utf-8", "yes"),
new XElement("root",
inputDictionary.Select(kvp => new XElement(valuesName,
new XAttribute("key", kvp.Key),
new XAttribute("value", kvp.Value)))));
doc.Save(#"c:\data.xml");
Complete sample app:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
class Test
{
static void Main()
{
XName valuesName = "entry";
var dictionary = new Dictionary<string, string>
{
{ "A", "B" },
{ "Foo", "Bar" }
};
var doc = new XDocument(
new XDeclaration("1.0", "utf-8", "yes"),
new XElement("root",
dictionary.Select(kvp => new XElement(valuesName,
new XAttribute("key", kvp.Key),
new XAttribute("value", kvp.Value)))));
doc.Save("test.xml");
}
}
Output (order of entries is not guaranteed):
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<root>
<entry key="A" value="B" />
<entry key="Foo" value="Bar" />
</root>
An alternative breakdown for this would be:
var elements = inputDictionary.Select(kvp => new XElement(valuesName,
new XAttribute("key", kvp.Key),
new XAttribute("value", kvp.Value)));
var doc = new XDocument(
new XDeclaration("1.0", "utf-8", "yes"),
new XElement("root", elements));
You may find this simpler to read.
try the following
XDocument xData = new XDocument(
new XDeclaration("1.0", "utf-8", "yes"));
XElement myXml = new XElement("paramList");// make sure your root and your descendents do not shre same name
foreach (var entry in MyList)
{
myXml.Add(new XElement(valuesName,
new XElement("key", entry.key),
new XElement("value", entry.Value)
));
xData.Add(myXml);
I have the following code:
XNamespace testNM = "urn:lst-emp:emp";
XDocument xDoc;
string path = "project_data.xml";
if (!File.Exists(path))
{
xDoc = new XDocument(
new XDeclaration("1.0", "UTF-16", null),
new XElement(testNM + "Test")
);
}
else
{
xDoc = XDocument.Load(path);
}
var element = new XElement("key",
new XElement("Type", type),
new XElement("Value", value));
xDoc.Element(testNM + "Test").Add(element);
// Save to Disk
xDoc.Save(path);
which produces an output in the XML file like this:
<?xml version="1.0" encoding="utf-16"?>
<Test xmlns="urn:lst-emp:emp">
<key xmlns="">
<Type>String</Type>
<Value>somestring</Value>
</key>
</Test>
How can I get an output like this in the XML file instead?
<?xml version="1.0" encoding="utf-16"?>
<Tests xmlns="urn:lst-emp:emp">
<key name="someString">
<Type>String</Type>
<Value>somestring</Value>
</key >
</Tests>
Note its only the 3rd line that has changed in the XML file.
You can do it this way:
var element = new XElement("key",
new XAttribute("name", "someString"),
new XElement("Type", "type"),
new XElement("Value", "value"));
To provide a complete version of Bilyukov's answer, this should produce the output expected. Obviously substitute the "someString" static string with a variable populated as you wish. Changes include using XName.Get(string, string) to create the appropriate XName objects for the XElement constructors.
XNamespace testNM = "urn:lst-emp:emp";
XDocument xDoc;
string path = "project_data.xml";
if (!File.Exists(path))
{
xDoc = new XDocument(
new XDeclaration("1.0", "UTF-16", null),
new XElement(XName.Get("Tests", testNM.NamespaceName))
);
}
else
{
xDoc = XDocument.Load(path);
}
var element = new XElement(XName.Get("key", testNM.NamespaceName),
new XAttribute("name", "someString"),
new XElement("Type", type),
new XElement("Value", value));
xDoc.Element(XName.Get("Tests", testNM.NamespaceName)).Add(element);
// Save to Disk
xDoc.Save(path);
Your XML has default namespace. Descendants of the element where default namespace declared is considered in the same default namespace, unless it is explicitly declared with different namespace. That's why you need to use the same XNamespace for <key> element. :
var element = new XElement(testNM +"key",
new XAttribute("name", "someString"),
new XElement(testNM +"Type", type),
new XElement(testNM +"Value", value));
I am trying to generate an XML using XDocument by pulling data from a DataTable at runtime. I want to have the output in this format:
<Document>
<Alphabets>
<Data>
<Capital>AAA</Capital>
<Small>aaa</Small>
</Data>
</Alphabets>
<Language>
<Name>English</Name>
</Language>
<Alphabets>
<Data>
<Capital>BBB</Capital>
<Small>bbb</Small>
</Data>
</Alphabets>
<Language>
<Name>English</Name>
</Language>
</Document>
The Language element has to be present after every Alphabets element. I have tried very hard to achieve this but I am unable to put this Alphabets tag after every Language element. What I have achieved is this, where the Language element is falling inside Alphabets element:
<Document>
<Alphabets>
<Data>
<Capital>AAA</Capital>
<Small>aaa</Small>
</Data>
<Language>
<Name>English</Name>
</Language>
</Alphabets>
<Alphabets>
<Data>
<Capital>BBB</Capital>
<Small>bbb</Small>
</Data>
<Language>
<Name>English</Name>
</Language>
</Alphabets>
</Document>
Here is my code :
static void Main(string[] args)
{
DataTable dtAlpha = new DataTable("Alphabetss");
dtAlpha.Columns.Add("Capital", typeof(string));
dtAlpha.Columns.Add("Small", typeof(string));
dtAlpha.Rows.Add("AAA", "aaa");
dtAlpha.Rows.Add("BBB", "bbb");
XDocument doc = new XDocument(
new XDeclaration("1.0", "UTF-8", null),
new XElement("Document",
from row in dtAlpha.AsEnumerable()
select new XElement("Alphabets",
new XElement("Data",
new XElement("Capital", row.Field<string>("Capital")),
new XElement("Small", row.Field<string>("Small"))
),
new XElement("Language",
new XElement("Name", "English")
)))
);
Console.WriteLine(doc.ToString());
Console.ReadKey();
}
Please help me on this.
You can try this way :
XDocument doc = new XDocument(
new XDeclaration("1.0", "UTF-8", null),
new XElement("Document")
);
foreach(var row in dtAlpha.AsEnumerable())
{
var alphabets = new XElement("Alphabets",
new XElement("Data",
new XElement("Capital", row.Field<string>("Capital")),
new XElement("Small", row.Field<string>("Small"))
)
);
var language = new XElement("Language",
new XElement("Name", "English")
);
doc.Root.Add(alphabets);
doc.Root.Add(language);
}
I am having an XML file. I would like to create a new node and append it at the end of the XML file and save it back to memory.
<IntCal>
<User>
<Date>12/09/2012</Date>
<Client>abcd</Client>
<Jewellery>Others</Jewellery>
<ROI>7.5</ROI>
<Description>Some Description</Description>
</User>
<IntCal>
I would like to create a new <User> element. Any idea how to do it.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlFile);
XmlNode root_node;
//XmlNodeList nodeList = xmlDoc.SelectNodes("/IntCal/User");
XmlDocument new_node = new XmlDocument();
root_node = xmlDoc.CreateElement("IntCal");
xmlDoc.AppendChild(root_node);
Thanks
Reference: http://msdn.microsoft.com/en-us/library/fw1ys7w6(v=vs.100).aspx
XmlElement elem = xmlDoc.CreateElement("User");
xmlDoc.DocumentElement.AppendChild(elem);
If you want to go the LINQ route, you could do:
XDocument xDoc = XDocument.Load(xmlFile);
xDoc.Element("IntCal")
.Add(new XElement("User"));
Personally, I'd opt for the XDocument and use LINQ but either way works.
Reference: http://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.aspx
XmlDocument is an old school, why don't you use XDocument, simple and easy:
XDocument xDoc = XDocument.Load(xmlFile);
xDoc.Root.Add(new XElement("User",
new XElement("Client", "John"),
new XElement("Jewellery", "Others")));
xDoc.Save(xmlFile);
References:
XDocument or XmlDocument
Performance: XDocument versus XmlDocument