VB9 - Using XmlDocument Or Linq To XML So Can Pull Variables - Without Looping
Aug 17, 2010
Visual Studio 2008. .NET 3.5 VB 2008 or VB9 as it is also called. I have an XML file that I need to parse efficiently. I had completed the project by means of pulling the document into an array and pulling the variables I needed via looping through the array. This turned out to be very inefficient as the file is quite large.
I am now looking into using XmlDocument or Linq to XML so that I can pull the variables that I need without looping. I read that Linq is the fastest so I was trying to go that route.
I have searched all over the place for examples of parsing xml documents and I can't find exactly what I need.
My XML file is formatted somewhat like this:
Code:
<Folder>
<set>
[CODE]............
The idea is that I need to get those <fp> values for certain f_types only. Not only that, but it also needs to <set> specific. You will notice that the second "<set>" has a <num> Value of 2 within the <data> tags.
So... I need to find a way to search for say all the <fp>'s in set one that are of f_type 5 only, exlcuding all of set 2's f_type 5. This XML is not ideal but re-formatting the XML is not an option for me. I have to work with what I got.
After hours of googling all I was able to do was pull all the Element values for each <F> child nodes if they included a f_type value of 5. But... It does it for the whole doc, not just the 1st set like I need.
I will post what I have so far: It is not much but I can't find great info on using Linq to xml that does what I am trying to do.
[Code]:.....................
This doesn't even need to be enclosed in an XML block but for some reason it wouldn't work unless I put it into XML block.
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Apr 27, 2012
I need to get a list of the item id attribute in a soap packaged XML file, in the example below ref-2 ref-3, but I'm having a problem finding examples that work and not even sure where my attempt at a linq to xml statement is failing. Are there any good examples of parsing a XMLDocument in a SOAP envelope or am I just making this way harder than it needs to be.
[Code]...
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Feb 28, 2010
i have an application that have been working correctly, but sudenly shown an error as this: Error at create form, Exception.InnerException. When i execute debuger show error at the instantiation variables as xmldocument, control or decimal.
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Jan 16, 2012
I have 8 boolean variables and i need to be able to add an email to an email string for each boolean that is true. I dont't know how to do it without writing a million if statements. Here is some of what i have:
if bIsBlue then
strEmailTo = strSalesEmail
strEmailTo = strEmailTo & ", " & varBlueGrp
End if
[Code].....
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Sep 8, 2010
I have a generic dictionary collection with a LOT of data classes, I am serializing this data and sending across IP. I need to cut down this collection into seperate messages as it is too large for my protocol to handle (and I am not changing that!).So, I would love a way to part serialize the data in say 25k (number not size) of classes, but I have not seen this done. I could manually loop through and create 25k lists of this data into new lists and then re-create at the other end, assuming I can use Join or AddRange. There is no GetRange on a collection.Is there a way in linq to select a range from a collection, or any other methods anyone has used?
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Aug 31, 2011
I don't know if this is doable, maybe with Linq, but I have a List(Of MyType):
Public Class MyType
Property key As Char
Property description As String
End Class
And I want to create a Dictionary(Of Char, MyType) using the key field as the dictionary keys and the values in the List as the dictionary values, with something like:
New Dictionary(Of Char, MyType)(??)
Even if this is doable, internally it will loop through all the List items, I guess?
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Mar 3, 2010
I am trying to work with an access database. If this line pulls data from a dataset and puts it into a textbox: TextBox1.Text = Me.A_DataSet.a_Table.Rows(0).Item(0).ToString How would I pull the field name? For Example, in this database I have 3 fields:
[Code]...
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May 18, 2012
Dim gg = From gs In AllData_TableList Order By gs.Biology Descending, gs.ChemistryDescending, gs.English Descending, gs.Frensh DescendingAll I need is to make this Statement order Dynamically like this
Dim Variable1 as string=Biology
Dim Variable2 as string=Chemistry
Dim Variable3 as string=English
[code].....
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Nov 23, 2009
I have a listbox that is dynamically filled by certain values depending on what table has been selected from another list box. Once a value is selected, it is being graphed vs a date & time range. With my ignorance of linq: depending on what value is selected, the linq to sql statement I need to create to grab data from my database is different as I can't use an index on an anonymous type.
result = From t In db.APS _
Where t.DateTime >= startDate And _
t.DateTime <= finishDate And t.Weight = weight _
Select t.DateTime, t.TotalConcentration
t.TotalConcentration should be selected if my listbox value is "Total Concentration", but if it's something else, like "Temperature" or "Flow Rate" (connected to appropreate database columns) - this method obviously isn't going to work. I need to be able to dynamically select a specific column from the anonymous type list, or use some other method I'm unaware of to do this.
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Mar 31, 2010
I've reached a point where it's time to learn how to Read/Write XML files properly and I'm really confused to how we're supposed to do this. I've been reading up on using the XmlDocument, but all I'm finding is how to use it to read xml files. Right now I need to Write them, later I'll code the reading of them.
The data for the XML file comes from a couple of tables in a database too, I've got a Master/Child table (actually there's 5 child tables). I've got the data coming into DataTables and I've got the loops set up already, I'm just stuck to how do I take the Master table's row and store that data as an XmlNode then loop each of the 5 child DataTable's and add each row as a child node to the master's node.
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May 29, 2012
and other non-visible characters such as whitespace in XmlDocument?I tried PreserveWhiteSpace = False and IgnoreWhiteSpace = True for XmlReaderSettings, but those didn't work.
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Jan 31, 2012
I have following xml:
[Code]....
and I need to pick node from Id 25 to id 75. It is a portion of XML. Original XML is very long. How to do it without XPath? Dim nodeList As XmlNodeList = xmlDoc.SelectNodes("//Node[@id >" & 25 & " and @id <" & 75 & "]") Dim sb As StringBuilder = New StringBuilder For Each childNode As XmlNode In nodeList sb.Append(childNode.InnerText) Next but it is not working ...
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Jan 8, 2010
How can i use XmlDocument.GetElementById method? It is always return Nothing
Code:
Private mXmlDoc As XmlDocument
Public Sub Read(ByVal strFileName As String)
[code].....
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Dec 13, 2010
I have a really simple example that reproduces an error that I'm seeing.
Module Module1
Sub Main()
Dim TransDoc As New System.Xml.XmlDocument()
[Code].....
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Apr 7, 2010
This is a spin off of my other thread: Write XML using XmlDocument
Now I have it creating an xml file and everything's good, I'm working on the the reading of it now. Here's my current
Try
Dim XmlDoc As New XmlDocument
XmlDoc.Load(m_ImportOpenFile.FileName)
[Code]....
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Jul 17, 2010
I'm trying to send a XML serialized class over a network stream the send is working
Dim IP As Net.IPAddress = System.Net.IPAddress.Parse(IPAddress)
Dim IPE As New Net.IPEndPoint(IP, 10003)
Dim TCPClient As New Net.Sockets.TcpClient
[code].....
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Mar 16, 2009
I am ably to load a XML file (via a filepath) to a datatable. See code below.However, I'd like to be able to load a in-memory XML document to a datatable.
Code: Public Function XmlToDataTable(ByRef filePath As String) As DataTable
Dim ds As New DataSet Dim dt As New DataTable ds.ReadXml(filePath) dt = ds.Tables(0).Copy()
Return dt
End Function
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Jun 19, 2012
I have two XmlDocuments that both have a namespace attribute specified. Both documents have the same structure, but contain different data. I can't seem to get a specific node tree from one document added to the end of the same node tree in a second document. Here is an example of my two documents:
Document #1:
<?xml version="1.0"?>
<rootnode xmlns="http://www.mynamespace.com/Service/2012-06-18">
[code]....
I certainly know this is wrong... I've tried serveral different approaches. This particular approach adds all <Item> nodes to the destination document, but it adds them to the very bottom of the document instead of after the last <Item>. how to add a specific node tree an XmlDocument to a specific position in another document? Again, there is a namespace involved and the <Item> nodes have nested nodes/elements under each one.
NOTE: The <Id> nodes have example data to show uniqueness only. I can never count on any kind of numbering. The order of each <Item> node is totally unimportant. I'm just assuming it will be easiest to add additional <Item> nodes after the last one in the destination document.
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Jul 20, 2010
I am having some problems building a properly formatted SOAP message using XMLDocument in VB.NET(C# answers are fine though). I am using the following code to manually create my SOAP message, what is happening is that the namespace prefix of the soap:Header and soap:Body are being stripped in the output XML:
[Code]...
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Feb 19, 2012
trying to parse this:
<?xml version="1.0" encoding="UTF-8"?>
<directoryresponse xmlns="https://www.sisow.nl/Sisow/REST" version="1.0.0">
<directory>[code]......
Here's my code:
XPath = "//directoryresponse/directory/issuer/issuerid"
Dim nodeList As XmlNodeList = XML.SelectNodes(XPath)
but nodelist.count=0...why?
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Jan 6, 2011
Consider the following XmlDocument with namespaces:
<Report xmlns="http://schemas.microsoft.com/sqlserver/reporting/2005/01/reportdefinition" xmlns:rd="http://schemas.microsoft.com/SQLServer/reporting/reportdesigner">
<DataSources>
[code]....
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Nov 11, 2009
I'm having trouble reading a simple xml file with the XmlDocument class. Here is my xml file:
[Code]...
I want the title attribute of the node but it gives me a message box instead saying: "System.Xml.XmlAttribute" How can I convert that or in some other way get the title attribute of the books? Another problem I will be running into is storing the books and readers in a 2D array dynamic array. How can I run through the <readers> nodes to store them in an array within the nodeTitle For Each loop?
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May 23, 2012
I have published xml document through web service like this
<WebMethod()> _
Public Function HelloWorld() As XmlDocument
Dim xmlDoc As New XmlDocument
[code]....
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Oct 28, 2011
Whenever I try and get the InnerText of an element using an XmlDocument, it throws a NullReferenceException. Here is the code below:
Dim SetDoc As New XmlDocument
Dim xmlString As String = "<upload><links><bananas>apple</bananas><original>thirteen</original></links></upload>"
[Code].....
The same happens when I load exactly the same XML from file.
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Mar 2, 2009
I am currently trying to load an XML file into my app. However, it keeps throwing an exception error (InvalidOperationException - Object reference not set to an instance of an object) and I can't work out why. have a look at the code below and see if you can spot the error? I'm still very much a beginner so i'm sure it will be something simple..
Public Class FrmXMLReaderTest
Inherits Form
Friend WithEvents txtOutput As TextBox
[Code].....
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Sep 12, 2011
Why does System.Xml.XmlDocument.LoadXml method throw System.Net.WebException ?if MSDN was right, LoadXml should at most give me a System.Xml.XmlException.Yet I have weird exceptions like:The underlying connection was closed: The connection was closed unexpectedly.
Dim document As New XmlDocument
document.LoadXml("<!DOCTYPE html PUBLIC ""-//W3C//DTD XHTML 1.0 Transitional//EN"" ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd""><x></x>")
MsgBox(document.LastChild.Name)
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Sep 8, 2011
I have an asp.net vb project that needs to parse some raw XML that is coming out of a database the XML is laid out like this:
[Code]....
I know that the error is because the attributes are not quoted. Is there anyway to make XmlDocument understand the attributes anyway or an easy way to use a reg expression to add quotes to the attributes before loading the string into the xmldoc?
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Aug 31, 2011
I have working code to read an RSS feed that uses:
Dim doc As New XmlDocument
doc.Load("http://...")
Dim channel As XmlElement = doc("rss")("channel")
Dim items As XmlNodeList = channel.GetElementsByTagName("item")
Unfortunately the doc.Load call causes the rest of the program to become unresponsive until it finishes.What's the best way to perform the load asynchronously and have a callback function to process the data?Edit: Here's the code I've tried using WebClient - the Load method is still lagging:
Private Sub checkResults()
'request rss feed
Dim w As New System.Net.WebClient
[code]....
The rssReadCallback method is executed fairly quickly after calling checkResults, but then the UI freezes during the Load method.
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Aug 26, 2009
Is there more elegant syntax for reading/parsing Size and Point objects in an Xml document?
Source Xml Nodes:
<objSize>{Width=64, Height=64}</objSize>
<Location_X>20</Location_X>
<Location_Y>20</Location_Y>
[Code].....
I have control over both the source nodes and the parsing code... So I am just being too lazy with my XmlNode creation? Regardless is there any benefit to using XmlConvert v.s. using integer.parse (or .tryparse)?
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May 25, 2012
This is a sample code in vb.net in which i retrieve the details of elements without attributes.
For Each standardItemInfoNode In ItemInfoNodes
baseDataNodes = ItemInfoNodes.ChildNodes
bFirstInRow = True
For Each baseDataNode As XmlNode In baseDataNodes
[code]....
How can i retrieve the details of the xml like having node with attributes and its child also having attributes. I need to retrieve all the attributes of node and its child node which are present in the middle of other xml tags.
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