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Help with combining XML Files using VB.NET

Posted on 2016-08-09
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Last Modified: 2016-08-11
Hi,

How do create an xml file with fields from 4 other xml files using VB.NET?

For example using two xml files, if the following two xml files contains multiple records with the following data elements:

File1.xml

<Root>
<Fields>
<ID>1</ID
<NSC>A</NSC>
<FIF>B</FIF>
<AGD>C</AGD>
<UVN>D</UVN>
</Fields
<Fields>
<ID>2</ID
<NSC>A1</NSC>
<FIF>B1</FIF>
<AGD>C1</AGD>
<UVN>D1</UVN>
</Fields
</Root>

File2.xml
<Root>
<Fields>
<ID>1</ID
<PFP>A</PFP>
<STL>B</STL>
<BGD>C</BGD>
<UVN>D</UVN>
</Fields
</Root>

How do I create one xml from the two files with no duplicate data elements?

<Root>
<Fields>
<ID>1</ID
<NSC></NSC>
<FIF></FIF>
<AGD></AGD>
<UVN></UVN>
<PFP></PFP>
<STL></STL>
<BGD></BGD>
</Fields
</Root>
Thanks,

victor
1
Comment
Question by:vcharles
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9 Comments
 
LVL 8

Expert Comment

by:Paweł
ID: 41749822
What i would do is de-serialize the xmls into objects use linq to combine the objects into one array or list then serialize that collection to file.
0
 
LVL 12

Expert Comment

by:funwithdotnet
ID: 41749829
There's many ways to do that. Many experts use XDocument or XElement to process XML files.

For me, it depends on the schema, content and use. I like to read XML into DataSets. I'm comfortable with processing data using System.Data tools. Whenever the XML schema fits a database structure, I use DataTable.ReadXml.

For writing the XML, I usually do it manually, because the schema isn't usually very database-like. Basically, I just iterate through DataRows, formatting & appending string data. DataTables can write XML, but I think it's easier to get the correct finished product manually.

Good luck!
0
 
LVL 12

Expert Comment

by:funwithdotnet
ID: 41749831
For uniqueness in elements returned, there are a number of ways to do that. I would just go through all the field in all the data and compile a list of unique columns. Then as the data is read, I can determine if a value should be captured for a given output element.
0
 
LVL 62

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 41750514
Hi Victor;

The following code snippet will do what you need.
'' Make a list of all the names to be compared in the query
Dim FileNames As New List(Of String) From {"..\..\file1.xml", "..\..\file2.xml"}
'' All the node names
Dim fields As List(Of String) = New List(Of String)
'' Go through all the files in the list to get the nodes names
For Each file As String In FileNames
    Dim xdoc = XDocument.Load(file)
    Dim nodeName As List(Of String) = (From f In xdoc.Descendants("Fields").Elements()
                                       Select f.Name.LocalName).ToList()
    fields.AddRange(nodeName)
Next
'' Fields now contains a list of all the Distinct field names
fields = fields.Distinct().ToList()
'' Create the new XML document with Distinct nodes
Dim newDoc = <Root>
                 <Fields>
                     <%= From n In fields
                         Select <<%= n %>/>
                     %>
                 </Fields>
             </Root>
'' Save the XML document to the file system
newDoc.Save("Main.xml")

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Author Comment

by:vcharles
ID: 41750746
Hello,

Thank you for all the comments. I will try the code and get back to you.

Victor
0
 

Author Comment

by:vcharles
ID: 41751027
Hi Fernando,

The code works. Thank You.

is there a way to avoid including table names of the xml files in code below? Each xml file contains different tables.

Dim nodeName As List(Of String) = (From f In xdoc.Descendants(???).Elements()
                                       Select f.Name.LocalName).ToList()
Thanks,

Victor
0
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 41751263
Hi Victor;

Change the query to this.
Dim nodeName As List(Of String) = (From f In xdoc.Root.Elements().Elements()
                                   Select f.Name.LocalName).ToList()

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0
 

Author Comment

by:vcharles
ID: 41751328
Thank you.
0
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 41751889
Hi Victor;

If the solution worked out for you please close the question.

Thanks
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