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vb.net XML edit in form..

Posted on 2010-08-19
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225 Views
Last Modified: 2012-05-10
Hello.. I have some problem. Start from the beginning..

I have XML-File


looks like this...


<?xml version="1.0" encoding="utf-8"?>
<tagdata>
  <readopcvalues>
    <value opctag="TEST.AI_Weight_KL3" />
    <value opctag="TEST._produktion" />
    <value opctag="SystemVariables.ServerTime" />
  </readopcvalues>
</tagdata>



What I would like to do first is have the change to add some new tags to my taglist..

tex. add this..

<value opctag="TEST.Goood" />


<?xml version="1.0" encoding="utf-8"?>
<tagdata>
  <readopcvalues>
    <value opctag="TEST.AI_Weight_KL3" />
    <value opctag="TEST._produktion" />
    <value opctag="SystemVariables.ServerTime" />
    <value opctag="TEST.Goood" />
  </readopcvalues>
</tagdata>




I have done this with this code but dosent get really waht I want.. The problem is that I always starts a new nodes and not write in the old one...

look


<?xml version="1.0" encoding="utf-8"?>
<tagdata>
  <readopcvalues>
    <value opctag="TEST.AI_Weight_KL3" />
    <value opctag="TEST._produktion" />
    <value opctag="SystemVariables.ServerTime" />
   </readopcvalues>
  <value opctag="TEST.Goood" />
</tagdata>




This is the code...

   '-- Declare local variable and load xml file
        Dim doc2 As New XmlDocument()
        doc2.Load("XML\TagData.xml")

        '-- Create a new node and add it to the document.
        Dim newline As XmlElement = doc2.CreateElement("value")

        newline.SetAttribute("opctag", "PLC.Beijer_Agnesberg.OP_Dagens_produktion")

        doc2.DocumentElement.AppendChild(newline)
        '-- Save the xml file with the new changes.
        doc2.Save("XML\TagData.xml")



Please give me some tips.. My follow question is that I wolud like to show the Whole XML lines in textboxes..
like this.

textbox1.text =  <value opctag="TEST.Goood" />
textbox2.text =    <value opctag="TEST.AI_Weight_KL3" />

Why I want this it´s because I wolud like to edit the old line.. or add a new line.. or remove one..
I hope someone understand! But first we take the easy party to write in the same nod! :D

//Kavvis
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Comment
Question by:kavvis
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11 Comments
 
LVL 27

Expert Comment

by:nmarun
ID: 33474452
0
 

Author Comment

by:kavvis
ID: 33474483
Arun  thank you but I really dont know how to use this info into my code....
any other idees?
0
 
LVL 27

Expert Comment

by:nmarun
ID: 33474842
This is what I'm talking.

Arun

private static void UpdateXml()
{
    string xmlPath = @"C:\Arun\Projects\ConsoleTest\ConsoleTest\Response.xml";

    DataSet dataSet = new DataSet();
    dataSet.ReadXml(xmlPath);
    dataSet.AcceptChanges();
    // <value opctag="TEST.Goood" />
    DataRow readopcvaluesRow = dataSet.Tables["readopcvalues"].Rows[0];
    DataRow newRow = dataSet.Tables["value"].NewRow();
    newRow["opctag"] = "Test.Gooood";
    dataSet.Tables["value"].Rows.Add(newRow);
    newRow.SetParentRow(readopcvaluesRow);
    dataSet.WriteXml(xmlPath, XmlWriteMode.IgnoreSchema);
}

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LVL 27

Expert Comment

by:nmarun
ID: 33474852
And here's the vb.net version.

Arun

Private Shared Sub UpdateXml()
	Dim xmlPath As String = "C:\Arun\Projects\ConsoleTest\ConsoleTest\Response.xml"

	Dim dataSet As New DataSet()
	dataSet.ReadXml(xmlPath)
	dataSet.AcceptChanges()
	' <value opctag="TEST.Goood" />
	Dim readopcvaluesRow As DataRow = dataSet.Tables("readopcvalues").Rows(0)
	Dim newRow As DataRow = dataSet.Tables("value").NewRow()
	newRow("opctag") = "Test.Gooood"
	dataSet.Tables("value").Rows.Add(newRow)
	newRow.SetParentRow(readopcvaluesRow)
	dataSet.WriteXml(xmlPath, XmlWriteMode.IgnoreSchema)
End Sub

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0
 

Author Comment

by:kavvis
ID: 33474956
Arun

OJ!! Thank you! Verry mutch!
It works greate!

Can I somehow remove on of lines tags in some simple way to?

I will give you the points just want to know some more info if you have before I close it! :D
/kavvis

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LVL 27

Expert Comment

by:nmarun
ID: 33474960
And here's the second part of your question.

Arun

Private Shared Sub ReadInnerXml()
	Dim xmlPath As String = "C:\Arun\Projects\ConsoleTest\ConsoleTest\Response.xml"

	Dim xDocument__1 As XDocument = XDocument.Load(xmlPath)

	Dim valueXmlList As List(Of String) = (From value In xDocument__1.Descendants("value")value.ToString()).ToList()

	For i As Integer = 0 To valueXmlList.Count - 1
		Console.WriteLine(valueXmlList(i))
	Next
End Sub

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Author Comment

by:kavvis
ID: 33474981
nmarun:  I can´t really get that to work my friend...
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LVL 27

Accepted Solution

by:
nmarun earned 500 total points
ID: 33475014
Try this.

Arun

Private Shared Sub RemoveXmlNode()
	Dim xmlPath As String = "C:\Arun\Projects\ConsoleTest\ConsoleTest\Response.xml"

	Dim dataSet As New DataSet()
	dataSet.ReadXml(xmlPath)
	dataSet.AcceptChanges()
	' <value opctag="TEST.Goood" />

	For i As Integer = 0 To dataSet.Tables("value").Rows.Count - 1
		If dataSet.Tables("value").Rows(i)("opctag").Equals("Test.Gooood") Then
			dataSet.Tables("value").Rows(i).Delete()
			dataSet.Tables("value").Rows(i).AcceptChanges()
		End If
	Next

	dataSet.WriteXml(xmlPath, XmlWriteMode.IgnoreSchema)
End Sub

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LVL 27

Expert Comment

by:nmarun
ID: 33475023
What are you getting?

Arun
0
 

Author Comment

by:kavvis
ID: 33475100
Sorry it was my bad!
that line worked perfekt!

Can I ask one more question..

If I want to show   " <value opctag="Test.Gooood" /> "  in a textbox

just to show all the lines... so I can se what the diffrent rows I have...
so I can delete or replace one of the line easy...

How do I do that the best way?

I have tried to make the whole XML dokumet to a long string and then
like this

textbox1.text = doc.tostring.substring(0.10)
textbox2.text = doc.tostring.substring(23.34)

but that dosent work.. so please tips me then I can close this question and give booth points! :D
0
 

Author Closing Comment

by:kavvis
ID: 33475646
Thank you!
everythin works very well now!
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