Solved

Help with loading xml file.

Posted on 2011-09-29
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189 Views
Last Modified: 2012-05-12
Hello,

I am using two different approaches to load the same xml file to accomodate two separate features, is there a way to only load it once?

a. Dim MyReceiver As XDocument = XDocument.Load(Server.MapPath("~/App_Data/Receiver.xml"))
b. Dim dom As New XmlDocument()
        dom.Load(Server.MapPath("~/App_Data/Receiver.xml"))

When using the first approach (a), i can't use MyReceiver.SelectNodes("//ReceiverTable")
 in my statement.

'Receiver
        Dim MyReceiver As XDocument = XDocument.Load(Server.MapPath("~/App_Data/Receiver.xml"))
        Dim LargestReceiverID = (From el In MyReceiver.Descendants("ReceiverTable") Select CInt(el.<Receiver_ID>.Value)).ToList
        ' LargestReceiverID.Sort()
        Dim CheckForItem = (From el In MyReceiver.Descendants("ReceiverTable").Elements("Receiver") Select el.Value).ToList
        If Not CheckForItem.Contains(Me.TextBox2.Text.ToString) Then
            Dim xNew As XElement = New XElement("ReceiverTable")
            xNew.Add(New XElement("Receiver_ID", (LargestReceiverID.Last() + 1)))
            xNew.Add(New XElement("Receiver", Me.TextBox2.Text.ToString))
            MyReceiver.Root.Add(xNew)
            MyReceiver.Save(Server.MapPath("~/App_Data/Receiver.xml"))
        End If
        Dim search As String = TextBox2.Text
        Dim searchId As String = Nothing
        Dim dom As New XmlDocument()
        dom.Load(Server.MapPath("~/App_Data/Receiver.xml"))
        Dim list As XmlNodeList = dom.SelectNodes("//ReceiverTable")
        If CheckForItem.Contains(Me.TextBox2.Text.ToString) Then
            For Each node As XmlNode In list
                If node("Receiver").InnerText.Equals(search) Then
                    searchId = node("Receiver_ID").InnerText
                    Exit For
                End If
            Next
        End If
0
Comment
Question by:vcharles
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7 Comments
 
LVL 14

Expert Comment

by:binaryevo
ID: 36815904
Try using this or a variant of this...  Linq makes it much cleaner.

string filePath = HttpContext.Current.Server.MapPath(SettingsModel.XMLFileLocation + "Moody.xml");
            if (File.Exists(filePath))
            {
                var xml = (from x in XElement.Load(filePath).Elements("Moody")
                           select new XMLModel
                           {
                               ID = x.Element("ID").Value,
                               Value = x.Element("Value").Value
                           });
                return xml;
            }
            else
            {
                throw new Exception("File Path is invalid or file doesnt exist.");
            }
0
 

Author Comment

by:vcharles
ID: 36815978
Can you please send me the code in VB.NET.

Thanks,

Victor
0
 
LVL 14

Accepted Solution

by:
binaryevo earned 500 total points
ID: 36816394
It would look something like this:

 
Dim filePath As String = "Moody.xml"

        If System.IO.File.Exists(FilePath) Then

            Dim xml = From x In XElement.Load(filePath).Elements("Moody")
                                   Select New XMLModel
                                   {
                                       ID = x.Element("ID").Value,
            Value = x.Element("Value").Value
                                   }


        Else
                'Handle your error here
        End If

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LVL 14

Expert Comment

by:binaryevo
ID: 36816399
Be sure to turn Option Infer On also
0
 
LVL 4

Expert Comment

by:theHollow
ID: 36816504
Hi
I haven't verified this, but you may wanna try going via the "DocumentElement" on the XmlDocument.

Dim dom As XmlDocument
Dim root As XmlNode

dom = New XmlDocument()
dom.Load(Server.MapPath("~/App_Data/Receiver.xml"))
root = dom.DocumentElement

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Now, you may be able to use "root.SelectNodes("//ReceiverTable")"

Hope it helped :-)
0
 

Author Comment

by:vcharles
ID: 36817118
Thanks, I will try it and get back to you.
0
 

Author Comment

by:vcharles
ID: 36817157
Hi,

I;m a bit confused, do I need to replace option a below with your code?

a. Dim MyReceiver As XDocument = XDocument.Load(Server.MapPath("~/App_Data/Receiver.xml"))
b. Dim dom As New XmlDocument()
        dom.Load(Server.MapPath("~/App_Data/Receiver.xml"))

How would it impact the rest of the code related to the code?

  Dim LargestReceiverID = (From el In MyReceiver.Descendants("ReceiverTable") Select CInt(el.<Receiver_ID>.Value)).ToList
        ' LargestReceiverID.Sort()
        Dim CheckForItem = (From el In MyReceiver.Descendants("ReceiverTable").Elements("Receiver") Select el.Value).ToList
        If Not CheckForItem.Contains(Me.TextBox2.Text.ToString) Then
            Dim xNew As XElement = New XElement("ReceiverTable")
            xNew.Add(New XElement("Receiver_ID", (LargestReceiverID.Last() + 1)))
            xNew.Add(New XElement("Receiver", Me.TextBox2.Text.ToString))
            MyReceiver.Root.Add(xNew)
            MyReceiver.Save(Server.MapPath("~/App_Data/Receiver.xml"))
        End If
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