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Problems reading an XML file and displaying value in textboxes

Posted on 2013-05-27
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Last Modified: 2013-05-29
Good afternoon,

I'm using Visual Studio Express 2012 for my VB.Net project.

I am trying to set up a settings area for my windows form. Writing to the XML file is not a problem as I can do that sucessfully without issue with my code so far.

The problem comes with read the xml file. Essentially I would like when the user opens the settings form the values from the xml file are inserted to "specific" text boxes on the settings form.

Is anyone able to tell me what I am doing wrong and if possible provide some sample code to help me get the reading part working?

Code is below, i would like to add all id's (1 through 4) to be read in the settings box, just provided id1 for now until i can get the right code for the others.

Public Class SettingsFrm

    Private Sub SettingsFrm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim rdxmlfile As String = "\\ServerA\ITDept\test\Settings.xml"

        'Create the xml xmlreader
        Dim XMLR As New Xml.XmlTextReader(rdxmlfile)

        'Read the id1 element
        XMLR.ReadStartElement("id1")

        'Read the value of the code1 element and display in the appropriate textbox
        XMLR.ReadStartElement("code1")
        XMLR.ReadString(CDtxtbx1.Text)
        XMLR.ReadEndElement()

        'Read the value of the docgroup1 element and display in the appropriate textbox
        XMLR.ReadStartElement("docgroup1")
        XMLR.ReadString(DGtxtbx1.Text)
        XMLR.ReadEndElement()

        'Read the value of the doctype1 element and display in the appropriate textbox
        XMLR.ReadStartElement("doctype1")
        XMLR.ReadString(DTtxtbx1.Text)
        XMLR.ReadEndElement()

        'Read the value of the docsubtype1 element and display in the appropriate textbox
        XMLR.ReadStartElement("docsubtype1")
        XMLR.ReadString(DSTtxtbx1.Text)
        XMLR.ReadEndElement()

        'close the id1 element
        XMLR.ReadEndElement()

        'close cml
        XMLR.Close()

    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim svxmlfile As String = "\\ServerA\ITDept\test\Settings.xml"

        'Create the xml writer obeject
        Dim XMLW As New Xml.XmlTextWriter(svxmlfile, System.Text.Encoding.GetEncoding("UTF-8"))

        'xml format to be written as:
        '<id1>
        '   <code1> FTO </code1>
        '   <docgroup1> Operations </docgroup1>
        '   <doctype1> Funds Transfer </doctype1>
        '   <docsubtype1> Out </docsubtype1>
        '</id1>

        XMLW.Formatting = Xml.Formatting.Indented

        'write id1
        XMLW.WriteStartElement("id1")

        ' <code element>
        XMLW.WriteStartElement("code1")
        XMLW.WriteValue(CDtxtbx1.Text)
        XMLW.WriteEndElement()

        ' <DocGroup element>
        XMLW.WriteStartElement("docgroup1")
        XMLW.WriteValue(DGtxtbx1.Text)
        XMLW.WriteEndElement()

        ' <DocType element>
        XMLW.WriteStartElement("doctype1")
        XMLW.WriteValue(DTtxtbx1.Text)
        XMLW.WriteEndElement()

        ' <DocSubType element>
        XMLW.WriteStartElement("docsubtype1")
        XMLW.WriteValue(DSTtxtbx1.Text)
        XMLW.WriteEndElement()

        'the end of id1
        XMLW.WriteEndElement()

        'write id2
        XMLW.WriteStartElement("id2")

        ' <code element>
        XMLW.WriteStartElement("code2")
        XMLW.WriteValue(CDtxtbx2.Text)
        XMLW.WriteEndElement()

        ' <DocGroup element>
        XMLW.WriteStartElement("docgroup2")
        XMLW.WriteValue(DGtxtbx2.Text)
        XMLW.WriteEndElement()

        ' <DocType element>
        XMLW.WriteStartElement("doctype2")
        XMLW.WriteValue(DTtxtbx2.Text)
        XMLW.WriteEndElement()

        ' <DocSubType element>
        XMLW.WriteStartElement("docsubtype2")
        XMLW.WriteValue(DSTtxtbx2.Text)
        XMLW.WriteEndElement()

        'the end of id2
        XMLW.WriteEndElement()

        'write id3
        XMLW.WriteStartElement("id3")

        ' <code element>
        XMLW.WriteStartElement("code3")
        XMLW.WriteValue(CDtxtbx3.Text)
        XMLW.WriteEndElement()

        ' <DocGroup element>
        XMLW.WriteStartElement("docgroup3")
        XMLW.WriteValue(DGtxtbx3.Text)
        XMLW.WriteEndElement()

        ' <DocType element>
        XMLW.WriteStartElement("doctype3")
        XMLW.WriteValue(DTtxtbx3.Text)
        XMLW.WriteEndElement()

        ' <DocSubType element>
        XMLW.WriteStartElement("docsubtype3")
        XMLW.WriteValue(DSTtxtbx3.Text)
        XMLW.WriteEndElement()

        'the end of id3
        XMLW.WriteEndElement()

        'write id4
        XMLW.WriteStartElement("id4")

        ' <code element>
        XMLW.WriteStartElement("code4")
        XMLW.WriteValue(CDtxtbx4.Text)
        XMLW.WriteEndElement()

        ' <DocGroup element>
        XMLW.WriteStartElement("docgroup4")
        XMLW.WriteValue(DGtxtbx4.Text)
        XMLW.WriteEndElement()

        ' <DocType element>
        XMLW.WriteStartElement("doctype4")
        XMLW.WriteValue(DTtxtbx4.Text)
        XMLW.WriteEndElement()

        ' <DocSubType element>
        XMLW.WriteStartElement("docsubtype4")
        XMLW.WriteValue(DSTtxtbx4.Text)
        XMLW.WriteEndElement()

        'the end of id4
        XMLW.WriteEndElement()

        'close the element
        XMLW.Close()

        MessageBox.Show("Settings Saved")
    End Sub

End Class

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Much thanks,
N
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Question by:nobushi
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5 Comments
 
LVL 36

Accepted Solution

by:
Miguel Oz earned 2000 total points
ID: 39199914
Your xml is very hard to maintain and it is not searchable because all the keys are different, You should change the id nodes to:
        '<info>
        '   <id>1</id>
        '   <code> FTO </code>
        '   <docgroup> Operations </docgroup>
        '   <doctype> Funds Transfer </doctype>
        '   <docsubtype> Out </docsubtype>
        '</info>

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Thus, you can easily generate your xml file, then read the values using xpath:
http://www.techrepublic.com/article/easily-navigate-xml-with-vbnet-and-xpath/5035074
http://www.aspfree.com/c/a/net/working-with-xpath-the-net-way/
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LVL 1

Author Comment

by:nobushi
ID: 39202009
What do you mean by not searchable?

I am only using the xml file as a place to store my applications settings. I need each node to be identifiable so that I can use the information within them to do other things within my application.

My form looks like below:

settings form
As i said before i can write no problem to the xml file my only problem now is to read the nodes from the form.

If an xml file is not the way to go with what I want to do what other options are there, ive read on several forums that ini files are outdated so this is why i didnt go this route.

Another Expert said i should use a DGV but i dont want to go this route and want to use text boxes.

I'm a beginner to VB.Net and programming in general, so if you can provide some other ideas and sample code, i would be most appreciative.

Please advise.
N
0
 
LVL 36

Expert Comment

by:Miguel Oz
ID: 39203089
Not searchable = means it is hard to search for a key using best practices (Xpath) because the proporty contains the Id.
My suggestion is the best way to build the xml file as the code only needs to loop every info record without looking for funny property names with id embedded into it.
UI textboxes is OK as how you store should independent of UI.

What is DGV?
0
 
LVL 1

Author Comment

by:nobushi
ID: 39204348
DataGridView

I'll give xpath a shot.
0
 
LVL 36

Expert Comment

by:Miguel Oz
ID: 39206218
0

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