Develop Reference

Get element contents from element C#

so here is the code i am using to get the other elements from my xml.
I have a data grid view that displays a lot of other elements but whenever I try to get 'Address1' etc it throws up an error. But I can call 'Address' and it puts all the elements of address into the one cell in my datagridview.
Can someone help me get 'Address1' and 'Address2' etc by themselves? I am stuck on this for a while now.
So am trying to get the details from 'Address1 & Address2'
Thanks in advance.

You can use XElement to parse your XML. ie:
void Main()
{
string s = #"<address>
<address1>Address 1</address1>
<address2>Address 2</address2>
<address3>Address 3</address3>
<address4>Address 4</address4>
<postcode>1234</postcode>
<country>MyCountry</country>
</address>";
var data = from r in XElement.Parse(s).DescendantsAndSelf("address")
select new {
Address1 = (string)r.Element("address1"),
Address2 = (string)r.Element("address2"),
Address3 = (string)r.Element("address3"),
Address4 = (string)r.Element("address4"),
Postcode = (string)r.Element("postcode"),
Country = (string)r.Element("country")
};
foreach(var d in data)
{
Console.WriteLine($"Address line1:{d.Address1}, Postcode:{d.Postcode}");
}
}

You can work with XDocument and then easily git the values of any node or its childs
see the following example:
var xdoc = XDocument.Load("filePath, xml as a stream, xml reader or text reader" );
var elems = fileDataXDoc.Descendants("Address").Elements();
the above part of code will return all sub address nodes as IEnumerable<XElements>
then you can work with it

C# Linq get descendants on a subquery

I've been banging my head on the desktop for the past couple of hours trying to decipher this issue.
I'm trying to query an XML file with Linq, the xml has the following format:
<MRLGroups>
<MRLGroup>
<MarketID>6084</MarketID>
<MarketName>European Union</MarketName>
<ActiveIngredientID>28307</ActiveIngredientID>
<ActiveIngredientName>2,4-DB</ActiveIngredientName>
<IndexCommodityID>59916</IndexCommodityID>
<IndexCommodityName>Cucumber</IndexCommodityName>
<ScientificName>Cucumis sativus</ScientificName>
<MRLs>
<MRL>
<PublishedCommodityID>60625</PublishedCommodityID>
<PublishedCommodityName>Cucumbers</PublishedCommodityName>
<MRLTypeID>238</MRLTypeID>
<MRLTypeName>General</MRLTypeName>
<DeferredToMarketID>6084</DeferredToMarketID>
<DeferredToMarketName>European Union</DeferredToMarketName>
<UndefinedCommodityLinkInd>false</UndefinedCommodityLinkInd>
<MRLValueInPPM>0.0100</MRLValueInPPM>
<ResidueDefinition>2,4-DB</ResidueDefinition>
<AdditionalRegulationNotes>Comments.</AdditionalRegulationNotes>
<ExpiryDate xsi:nil="true" />
<PrimaryInd>true</PrimaryInd>
<ExemptInd>false</ExemptInd>
</MRL>
<MRL>
<PublishedCommodityID>60626</PublishedCommodityID>
<PublishedCommodityName>Gherkins</PublishedCommodityName>
<MRLTypeID>238</MRLTypeID>
<MRLTypeName>General</MRLTypeName>
<DeferredToMarketID>6084</DeferredToMarketID>
<DeferredToMarketName>European Union</DeferredToMarketName>
<UndefinedCommodityLinkInd>false</UndefinedCommodityLinkInd>
<MRLValueInPPM>0.0100</MRLValueInPPM>
<ResidueDefinition>2,4-DB</ResidueDefinition>
<AdditionalRegulationNotes>More Comments.</AdditionalRegulationNotes>
<ExpiryDate xsi:nil="true" />
<PrimaryInd>false</PrimaryInd>
<ExemptInd>false</ExemptInd>
</MRL>
</MRLs>
</MRLGroup>
So far i've created classes for the "MRLGroup" section of the file
var queryMarket = from market in doc.Descendants("MRLGroup")
select new xMarketID
{
MarketID = Convert.ToString(market.Element("MarketID").Value),
MarketName = Convert.ToString(market.Element("MarketName").Value)
};
List<xMarketID> markets = queryMarket.Distinct().ToList();
var queryIngredient = from ingredient in doc.Descendants("MRLGroup")
select new xActiveIngredients
{
ActiveIngredientID = Convert.ToString(ingredient.Element("ActiveIngredientID").Value),
ActiveIngredientName = Convert.ToString(ingredient.Element("ActiveIngredientName").Value)
};
List<xActiveIngredients> ingredientes = queryIngredient.Distinct().ToList();
var queryCommodities = from commodity in doc.Descendants("MRLGroup")
select new xCommodities {
IndexCommodityID = Convert.ToString(commodity.Element("IndexCommodityID").Value),
IndexCommodityName = Convert.ToString(commodity.Element("IndexCommodityName").Value),
ScientificName = Convert.ToString(commodity.Element("ScientificName").Value)
};
List<xCommodities> commodities = queryCommodities.Distinct().ToList();
After i got the "catalogues" I'm trying to query the document against the catalogues to achieve some sort of "groups", after all this, i'm going to send this data to the database, the issue here is that the xml files are around 600MB each and i get the everyday, so my approach is to create catalogues and just send the MRLs to the database joined to the "header" table that contains the Catalogues IDs, here's what i've done so far but failed miserably:
//markets
foreach (xMarketID market in markets) {
//ingredients
foreach (xActiveIngredients ingredient in ingredientes) {
//commodities
foreach (xCommodities commodity in commodities) {
var mrls = from m in doc.Descendants("MRLGroup")
where Convert.ToString(m.Element("MarketID").Value) == market.MarketID
&& Convert.ToString(m.Element("ActiveIngredientID").Value) == ingredient.ActiveIngredientID
&& Convert.ToString(m.Element("IndexCommodityID").Value) == commodity.IndexCommodityID
select new
{
ms = new List<xMRLIndividial>(from a in m.Element("MRLs").Descendants()
select new xMRLIndividial{
publishedCommodityID = string.IsNullOrEmpty(a.Element("PublishedCommodityID").Value) ? "" : a.Element("PublishedCommodityID").Value,
publishedCommodityName = a.Element("PublishedCommodityName").Value,
mrlTypeId = a.Element("MRLTypeID").Value,
mrlTypeName = a.Element("MRLTypeName").Value,
deferredToMarketId = a.Element("DeferredToMarketID").Value,
deferredToMarketName = a.Element("DeferredToMarketName").Value,
undefinedCommodityLinkId = a.Element("UndefinedCommodityLinkInd").Value,
mrlValueInPPM = a.Element("MRLValueInPPM").Value,
residueDefinition = a.Element("ResidueDefinition").Value,
additionalRegulationNotes = a.Element("AdditionalRegulationNotes").Value,
expiryDate = a.Element("ExpiryDate").Value,
primaryInd = a.Element("PrimaryInd").Value,
exemptInd = a.Element("ExemptInd").Value
})
};
foreach (var item in mrls)
{
Console.WriteLine(item.ToString());
}
}
}
}
If you notice i'm trying to get just the MRLs descendants but i got this error:
All i can reach on the "a" variable is the very first node of MRLs->MRL not all of them, what is going on?
If you guys could lend me a hand would be super!
Thanks in advance.

With this line...
from a in m.Element("MRLs").Descendants()
...will iterate through all sub-elements, including children of children. Hence your error, since your <PublishedCommodityID> element does not have a child element.
Unless you want to specifically return all child elements of all levels, always use the Element and Elements axis instead of Descendant and Descendants:
from a in m.Element("MRLs").Elements()
That should solve your problem.
However, your query is also difficult to read with the nested foreach loops and the multiple tests for the IDs. You can simplify it with a combination of LINQ and XPath:
var mrls =
from market in markets
from ingredient in ingredientes
from commodity in commodities
let xpath = $"/MRLGroups/MRLGroup[{market.MarketId}]" +
$"[ActiveIngredientID={ingredient.ActiveIngredientId}]" +
$"[IndexCommodityID={commodity.IndexCommodityID}]/MRLs/MRL"
select new {
ms =
(from a in doc.XPathSelectElements(xpath)
select new xMRLIndividial {
publishedCommodityID = string.IsNullOrEmpty(a.Element("PublishedCommodityID").Value) ? "" : a.Element("PublishedCommodityID").Value,
publishedCommodityName = a.Element("PublishedCommodityName").Value,
mrlTypeId = a.Element("MRLTypeID").Value,
mrlTypeName = a.Element("MRLTypeName").Value,
deferredToMarketId = a.Element("DeferredToMarketID").Value,
deferredToMarketName = a.Element("DeferredToMarketName").Value,
undefinedCommodityLinkId = a.Element("UndefinedCommodityLinkInd").Value,
mrlValueInPPM = a.Element("MRLValueInPPM").Value,
residueDefinition = a.Element("ResidueDefinition").Value,
additionalRegulationNotes = a.Element("AdditionalRegulationNotes").Value,
expiryDate = a.Element("ExpiryDate").Value,
primaryInd = a.Element("PrimaryInd").Value,
exemptInd = a.Element("ExemptInd").Value
}).ToList()
};

Check if XML node value already exists in xml file using c#

Please note that I'm new to C# and I learn it right now :) I couldn't find something similar to my problem, so I came here.
I have an application in which I add customers (it's in the final stage). All customers are stored in an XML file. Every single customer gets a new customer number. In my xml file I got an XmlNode called CustNo. Now if the user add a new customer and type in a number which already exist, it should pop up a message box to say that this number already exists. I got this c# code:
XDocument xdoc = XDocument.Load(path + "\\save.xml");
var xmlNodeExist = String.Format("Buchhaltung/Customers/CustNo");
var CustNoExist = xdoc.XPathSelectElement(xmlNodeExist);
if (CustNoExist != null)
{
MessageBox.Show("asdf");
}
And my XML file looks like this:
<Buchhaltung>
<Customers>
<CustNo>12</CustNo>
<Surname>Random</Surname>
<Forename>Name</Forename>
<Addr>Address</Addr>
<Zip>12345</Zip>
<Place>New York</Place>
<Phone>1234567890</Phone>
<Mail>example#test.com</Mail>
</Customers>
<Customers>
<CustNo>13</CustNo>
<Surname>Other</Surname>
<Forename>Forename</Forename>
<Addr>My Address</Addr>
<Zip>67890</Zip>
<Place>Manhattan</Place>
<Phone>0987654321</Phone>
<Mail>test#example.com</Mail>
</Customers>
</Buchhaltung>
But then the message box always pops up. What am I doing wrong?

That's because your XPath return all CustNo elements, no matter of it's content.
Try following:
var myNumber = 12;
var xmlNodeExist = String.Format("Buchhaltung/Customers/CustNo[. = {0}]", myNumber.ToString());
or using First and LINQ to XML:
var myNumber = 12;
var xmlNodeExist = "Buchhaltung/Customers/CustNo";
var CustNoExist = xdoc.XPathSelectElements(xmlNodeExist).FirstOrDefault(x => (int)x == myNumber);

You are currently testing for existance of any 'CustNo' element. See this reference about the XPath syntax.
Your XPath should say something like this:
Buchhaltung//Customers[CustNo='12']
which would say "any customers element containing a 'CustNo' element with value = '12'"
Combining that with your current code:
var custNoGivenByCustomer = "12";
var xmlNodeExistsXpath = String.Format("Buchhaltung//Customers[CustNo='{0}']", custNoGivenByCustomer );
var CustNoExist = xdoc.XPathSelectElement(xmlNodeExistsXpath);

You can use LINQ to XML
var number = textBox1.Text;
var CustNoExist = xdoc.Descendants("CustNo").Any(x => (string)x == number);
if(CustNoExist)
{
MessageBox.Show("asdf");
}

This is because you select the CustNo elements regardless of their value. This will filter it to the desired customer number:
int custNo = 12;
var xmlNodeExist = String.Format("Buchhaltung/Customers[CustNo={0}]", custNo);
It selects the Customers elements instead, but since you're just checking for existence, that's unimportant.
W3Schools has a good tutorial/reference on XPath.

c# return all specific elements from an xml

Greetings. Im having a small trouble i would like to have some help with. Im having a very large xml file with about 1000 customers with diffrent customer information. And I would like to do methods to retrive this information. Ive been searching everywhere but cant seem to find what im looking for. Currently im trying:
public custInformation getcustInfo(string file) {
//Load the xml file
var xe = XDocument.Load(_server.MapPath(file)).Root;
//Get information
return (from p in xe.Descendants("cust-account").Descendants("cust-info")
select new custInformation
{
firstName = (string)p.Element("cust-fname"),
lastName = (string)p.Element("cust-lname"),
address = (string)p.Element("cust-address1"),
}).(All elements)??
}
(All elements) is where id like to retrive all the information. Using FirstOrDefault will only retrive the first element and LastOrDefault will only retrive the first element. If some one could help me i would be very greatefull.

you want a list of customers. Change the return value to IEnumerable
and transform the query to IEnumerable with ToList()/ToArray():
public IEnumerable<custInformation> getcustInfo(string file) {
//Load the xml file
var xe = XDocument.Load(_server.MapPath(file)).Root;
//Get information
return (from p in xe.Descendants("cust-account").Descendants("cust-info")
select new custInformation
{
firstName = (string)p.Element("cust-fname"),
lastName = (string)p.Element("cust-lname"),
address = (string)p.Element("cust-address1"),
}).ToList();
}

C# LINQ - reading an XML

i need to store all the informationen from the xml in an array. My code doesn't work, because I always get just the first item from the xml.
Does anyone know how to fix this?
XDocument xdoc = XDocument.Load("http://www.thefaxx.de/xml/nano.xml");
var items = from item in xdoc.Descendants("items")
select new
{
Title = item.Element("item").Element("title").Value,
Description = item.Element("item").Element("description").Value
};
foreach (var item in items)
{
listView1.Items.Add(item.Title);
}

How about:
var items = from item in xdoc.Descendants("item")
select new
{
Title = item.Element("title").Value,
// *** NOTE: xml has "desc", not "description"
Description = item.Element("desc").Value
};
It is a little hard to be sure without sample xml - but it looks like you intend to loop over all the <item>...</item> elements - which is what the above does. Your original code loops over the (single?) <items>...</items> element(s), then fetches the first <item>...</item> from within it.
edit after looking at the xml; this would be more efficient:
var items = from item in xdoc.Root.Elements("item")
select new {
Title = item.Element("title").Value,
Description = item.Element("desc").Value
};