Order frequent XML Data by group using LINQ

Order frequent XML Data by group using LINQ - c#

I have an XDocument with this data:
<item>
<name>Name 1</name>
<group>foo</group>
...
</item>
<item>
<name>Name 2</name>
<group>bar</group>
...
</item>
<item>
<name>Name 3</name>
<group>foo</group>
...
</item>
That means I have 2 items with group = foo and 1 item with group = bar. How can I order that data by the most frequent group? Result:
<item>
<name>Name 1</name>
<group>foo</group>
...
</item>
<item>
<name>Name 3</name>
<group>foo</group>
...
</item>
<item>
<name>Name 2</name>
<group>bar</group>
...
</item>
Data is loaded like this:
XDocument xml = XDocument.Load(#"\path\data.xml");

You can use a simple GroupBy and OrderByDescending:
var items = xml.Root.Elements()
.GroupBy(r => r.Element("group").Value)
.OrderByDescending(r => r.Count())
.ToList();
Then simply remove all nodes and add them ordered:
xml.Root.RemoveAll();
xml.Root.Add(items);

If you want to work with objects instead of the xml, you'll first need to deserialize the xml into a List<Item>, where each Item is a class of the same structure in the xml.
After that, when you have the list you can use GroupBy:
var newList = list.GroupBy(i => i.Group) //group together by "group" value
.OrderByDescending(i => i.Count()) //simple ordering
.SelectMany(i => i) //flatten the hierarchy
.ToList(); //back to list

Related

Load XML containing multiple lists to multiple DataTables

I have an XML that has the below structure:
<?xml version="1.0" encoding="utf-8"?>
<n0:Response xmlns:n0="urn:sap-com:document:sap:rfc:functions">
<Cars>
<item>
<ID>1</ID>
<TYPE>SUV</TYPE>
<YEAR>2022</YEAR>
</item>
<item>
<ID>2</ID>
<TYPE>Convertible</TYPE>
<YEAR>2021</YEAR>
</item>
</Cars>
<Employees>
<item>
<ID>1</ID>
<NAME>John</NAME>
<STATUS>1</STATUS>
<PHONE>000000000</PHONE>
</item>
<item>
<ID>2</ID>
<NAME>Sam</NAME>
<STATUS>2</STATUS>
<PHONE>000000000</PHONE>
</item>
<item>
<ID>3</ID>
<NAME>Jane</NAME>
<STATUS>1</STATUS>
<PHONE>000000000</PHONE>
</item>
</Employees>
</n0:Response>
(this is just a sample, the final file will have more than 10k items per row)
I need to load that file to two DataTables, each having the correct values.
I do this by creating DataSet, loading XML, and filtering the data table.
My DataSet has 3 tables:
but when I try to access the correct data table I get all the items instead of the correct ones (I get items from the entire XML):
var rel = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Cars")?.ChildTable;
this is the result:
I managed to filter the data by adding a Select statement like below:
var ds = new DataSet();
using Stream stream = new FileStream("Sample.xml", FileMode.Open, FileAccess.Read);
ds.ReadXml(stream);
var table1 = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Cars")?
.ChildTable.Select("Cars_Id = 0").CopyToDataTable();
var table2 = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Employees")?
.ChildTable.Select("Employees_Id = 0").CopyToDataTable();
but this isn't generic and I'd like to be able to access the correct DataTable only by name (the node name from XML).
My question is similar to How to get multiple tables in Dataset from XML, but the provided answer didn't solve the issue.

Select an element who as a last child with property

<bus>
<port>
<req>
<item>
[...]
</item>
</req>
[...]
<req>
<item>
[...]
</item>
</req>
</port>
[...]
<port>
<req>
<item>
[...]
</item>
</req>
[...]
<req>
<item>
[...]
</item>
</req>
</port>
</bus>
<bus>
[...] (same as before)
</bus>
I have this structure; all the structures repeats themselves. I need to select the last port element of a bus which has a last child with property "mode"=="read".
It can exist a bus which has a last port element with a last child with property different from "read", so I need to choose the right port element.
I tried lots of tries, last one is this, but does not works:
var modbusportSelected = Elements("bus").Elements("port")
.Where( x => x.Elements("req")
.Any(y => y.Attribute("mode").Value.Contains("read")))
.Last();
Any help would be greatly appreciated; also, I'm totally new with LINQ to XML and I cannot find a single webpage where to get the exact meaning of "Any" and if there are other operators, and if so, what they are.

It may be significant that your XML snippet needs a top level element. If you wrap what you have above in an outer tag, then your code appears to work provided you trap null references from any port elements which don't have a mode attribute. eg.
using System;
using System.Linq;
using System.Xml.Linq;
namespace ConsoleApp1
{
class Program
{
public static string xml = #"<topLevel><bus>
<port isCorrectNode='no'>
<req>
<item>
</item>
</req>
<req mode='read'>
<item>
</item>
</req>
</port>
<port isCorrectNode='yes'>
<req mode='read'>
<item>
</item>
</req>
<req>
<item>
</item>
</req>
</port>
</bus>
<bus>
</bus>
</topLevel>";
static void Main(string[] args)
{
XElement root = XElement.Parse(xml);
var found = root.Elements("bus").Elements("port")
.Where(x => x.Elements("req").Any(y => y.Attribute("mode") != null && y.Attribute("mode").Value.Contains("read")))
.Last();
var isThisTheCorrectNode = found.Attribute("isCorrectNode").Value;
Console.WriteLine(isThisTheCorrectNode);
}
}
}
will write yes
Edit: I've noticed your code looks for the last port which has any child req whose mode is 'read'. but your question asked for the last such req. In that case:
var wanted = root.Elements("bus").Elements("port")
.Where(x => x.Elements("req").Any() && // make sure there is a req element
x.Elements("req").Last().Attribute("mode") != null && // and it has the attribute
x.Elements("req").Last().Attribute("mode").Value.Contains("read")) // and it has the right value
.Last();

How can I select a specific XML node and fetch the values in its child nodes

I'm trying to select a specific node and fetch the values in it's childnodes. This would normally be pretty easy, but the complication is that the nodes have the same name. My xml looks something like this;
<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>
Each <ID>'s innertext is always unique. I now want to select the <Item> ,where it's <ID>'s innertext is "Stack". (I need the other childnode-values as well, like Pth, Zvb and Ico. So everything under <Item> basically)
I did this is powershell, and it looks something like this;
$script:specificItem = $dgvItems.rows[$_.RowIndex].Cells[1].Value
$script:fetch = #($xml.SelectNodes('//Item')) | Select-Object * | Where { $_.ID -like $specificItem }
So far I've got this (I'm in a RowEnter event of a datagridview):
XmlDocument xml = new XmlDocument();
xml.Load(GlobalVars.configfile);
int rowindex = dgvItemlist.CurrentCell.RowIndex;
dgvItemlist.Rows[rowindex].Cells[2].Value.ToString(); //This will contain for example "Stack"
XmlNodeList Items = xml.SelectNodes("//Items/Item"); //probably other ways to start as well
... but from here I struggle with filtering or selecting the one I want. I know this is a fairly common question, but I can't find a good solution for this exact issue.

You could also use XDocument (Linq to XML):
string xml =#"<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>";
XDocument xdoc = XDocument.Parse(xml);
XElement desired = xdoc.Descendants("Item").FirstOrDefault(x=>(string)x.Element("ID")=="Stack");
if(desired!=null)
{
string Pth = (string)desired.Element("Pth");
string Zvb = (string)desired.Element("Zvb");
string Ico = (string)desired.Element("Ico");
}
desired will be the wanted element.

Try to change the last line of your code into:
XmlNodeList Items = xml.SelectNodes("//Items/Item[ID='Stack']");
This should return:
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>

Try the following. It will return the specific node you are looking for.
XmlNode itemNode = doc.SelectSingleNode("//ID[text()='Stack']").ParentNode;

Linq to Xml query to child nodes

<InventoryList>
<Product xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Id>1</Id>
<Name>Pizza Ristorante Hawaii</Name>
<Price>2.99</Price>
<VariableWeightPrice>€ 8,42 / kg</VariableWeightPrice>
<Brand>Dr.Oetker</Brand>
<PackageInfo>355 GR</PackageInfo>
<categoryString />
<PictureSmallFilename>1small.jpg</PictureSmallFilename>
<InformationTakenFrom>Jumbo</InformationTakenFrom>
<MarketItemUrl></MarketItemUrl>
<BarCode>4001724819608</BarCode>
<IsBlackListed>false</IsBlackListed>
<ItemLists>
<Item>
<ListName>in</ListName>
<Quantity>1</Quantity>
<QuantityWeight>0</QuantityWeight>
</Item>
<Item>
<ListName>out</ListName>
<Quantity>2</Quantity>
<QuantityWeight>0</QuantityWeight>
</Item>
</ItemLists>
</Product>
<Product xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Id>2</Id>
<Name>Produto 2</Name>
<Price>2.99</Price>
<VariableWeightPrice>€ 5,55 / kg</VariableWeightPrice>
<Brand>Dr.Oetker</Brand>
<PackageInfo>355 GR</PackageInfo>
<categoryString />
<PictureSmallFilename>1small.jpg</PictureSmallFilename>
<InformationTakenFrom>Jumbo</InformationTakenFrom>
<MarketItemUrl></MarketItemUrl>
<BarCode>4001724819608</BarCode>
<IsBlackListed>false</IsBlackListed>
<ItemLists>
<Item>
<ListName>out</ListName>
<Quantity>1</Quantity>
<QuantityWeight>0</QuantityWeight>
</Item>
</ItemLists>
</Product>
</InventoryList>
thanks in advance for your help.
I have this xml database
i want to return all products that have the ListName = "out", but this query i´m trying it´s only returning the second product, and i need it to return the first and the second product.
var _queryItems = from c in xml.Descendants("Product")
where
c.Element("ItemLists").Element("Item").Element("ListName").Value == "out"
select c;
thanks :)

Right now you just check the first Item element, instead you want to check if any Item's ListName matches "out":
var _queryItems = from c in xml.Descendants("Product")
where c.Element("ItemLists")
.Elements("Item").Any( x=> x.Element("ListName").Value == "out")
select c;

Need a Nested LINQ to XML query help

i have a XML file as follows:
<?xml version="1.0" encoding="utf-8" ?>
<publisher>
<name>abc</name>
<link>http://</link>
<description>xyz</description>
<category title="Top">
<item>
<title>abc</title>
<link>http://</link>
<pubDate>1</pubDate>
<description>abc</description>
</item>
<item>
<title>abc</title>
<link>http://</link>
<pubDate>2</pubDate>
<description>abc</description>
</item>
</category>
<category title="Top2">
<item>
<title>abc</title>
<link>http://</link>
<pubDate>1</pubDate>
<description>abc</description>
</item>
<item>
<title>abc</title>
<link>http://</link>
<pubDate>2</pubDate>
<description>abc</description>
</item>
</category>
</publisher>
I need to write a LINQ to XML query in C# which returns everything under a "category" tag based on the value of attribute provided. I have tried the following code but it gives me error. Any help will be appreciated:
System.Xml.Linq.XElement xml = System.Xml.Linq.XElement.Parse(e.Result);
IEnumerable<string> items = from category in xml.Elements("category")
where category.Attribute("title").Value == "Top"
select category.ToString();

IEnumerable<string> items = from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category.ToString();
Of course, that's going to give you a list with one string in it. If you want just the string in it:
var items = (from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category.ToString()).First();
But, if you want to continue processing the XML, you probably really want it as a XElement object:
var items = (from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category).First();

Develop Reference

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

Order frequent XML Data by group using LINQ - c#

You can use a simple GroupBy and OrderByDescending: var items = xml.Root.Elements() .GroupBy(r => r.Element("group").Value) .OrderByDescending(r => r.Count()) .ToList(); Then simply remove all nodes and add them ordered: xml.Root.RemoveAll(); xml.Root.Add(items);

Related

Load XML containing multiple lists to multiple DataTables

Select an element who as a last child with property

How can I select a specific XML node and fetch the values in its child nodes

Linq to Xml query to child nodes

Need a Nested LINQ to XML query help

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