Help with appending data elememt from xmlfile1 to xmlfil2 based on identical IDs

Hi,


If file1.xml contains

<Table1>
<SN>10411</SN>
<NSC>ITEMA</NSC>
</Table1>
<Table1>
<SN>10412</SN>
<NSC>ITEMB</NSC>
</Table1>
<Table1>
<SN>10421</SN>
<NSC>ITEMC</NSC>
</Table1>
<Table1>
<SN>10521</SN>
<NSC>ITEMD</NSC>
</Table1>
<Table1>
<SN>10611</SN>
<NSC>ITEME</NSC>
</Table1>


and file2.xml contains

<Table1>
<SN>10411</SN>
<NSD>ITEMY</NSD>
</Table1>
<Table1>
<SN>10412</SN>
<NSD>ITEMV</NSD>
</Table1>
<Table1>
<SN>10421</SN>
<NSD>ITEMW</NSD>
</Table1>

How do I append NSD IN file1.xml where N have identical values using VB.NET?

Victor
vcharlesAsked:
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Fernando SotoConnect With a Mentor RetiredCommented:
Hi Victor;

This should give you what you are looking for.

' Load the file1.xml and file2.xml into memory
Dim f1 = XDocument.Load("C:\Working Directory\file1.xml")
Dim f2 = XDocument.Load("C:\Working Directory\file2.xml")

' Query both documents and Join on the SN node in each 
Dim results = From n1 In f1.Descendants("Table1") _
              Join n2 In f2.Descendants("Table1") On n1.Element("SN").Value Equals n2.Element("SN").Value _
              Select n1, n2

' Add the NSD node in file2.xml to the corresponding node in file1.xml
For Each pair in results
    pair.n1.Add(pair.n2.Element("NSD"))
Next

' Save file1.xml as file3.xml
f1.Save("C:\Working Directory\file3.xml")

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Fernando SotoRetiredCommented:
The file1.xml does NOT have a node with NSD in it. Also please show what you want the resulting file2.xml to look like after the operation is complete.
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vcharlesAuthor Commented:
Hi,

Just read your post. Based on the example I gave, File3.xml should look as follows:

<Table1>
<SN>10411</SN>
<NSC>ITEMA</NSC>
<NSD>ITEMY</NSD>
</Table1>
<Table1>
<SN>10412</SN>
<NSC>ITEMB</NSC>
<NSD>ITEMV</NSD>
</Table1>
<Table1>
<SN>10421</SN>
<NSC>ITEMC</NSC>
<NSD>ITEMV</NSD>
</Table1>
<Table1>
<SN>10521</SN>
<NSC>ITEMD</NSC>
</Table1>
<Table1>
<SN>10611</SN>
<NSC>ITEME</NSC>
</Table1>
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Fernando SotoRetiredCommented:
OK, having the new file1.xml and the old file2.xml what should the new file2.xml look like.?
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Carl TawnSystems and Integration DeveloperCommented:
You need something along the lines of the following:
        '// assuming "doc1" has file1 loaded and "doc2" has file2 loaded

        Dim nodes As XmlNodeList = doc2.SelectNodes("//Table1")
        Dim copyNode As XmlNode
        Dim targetNode As XmlNode

        For Each node As XmlNode In nodes

            targetNode = doc1.SelectSingleNode("//Table1[SN='" & node("SN").InnerText & "']")
            If Not targetNode Is Nothing Then
                copyNode = targetNode.OwnerDocument.ImportNode(node("NSD"), True)
                targetNode.AppendChild(copyNode)
            End If

        Next

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vcharlesAuthor Commented:
Hi,

Once I combine the data element from file2 with file1 to create a new file, I don't need file2.

Thanks,

Victor
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Carl TawnSystems and Integration DeveloperCommented:
OK, so ditch it then. The code i posted appends the nodes to file1, you just need to call Save() on the XmlDocument object to commit it to disk. You can do what you like with file2 after that point.
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vcharlesAuthor Commented:
Hi,

I will try it and get back to you.

Thank You.

Victor
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Fernando SotoRetiredCommented:
Hi Victor;

It looks like the two XML files are NOT well formed, they are both missing a root node and therefore cannot be loaded into an XML Document. Does the actual documents have a root node and if not is there an issue of adding one?
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vcharlesAuthor Commented:
Hi,

What I initially posted was just an example, I forgot to include the <Root> </Root> nodes. Yes, please inlcude them.

Thanks,

Victor
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vcharlesAuthor Commented:
Thank You. I will try it and get back to you.
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vcharlesAuthor Commented:
Hi,

How do I declare XDocument? tried to declare it XMLDocument but that didn't work.

V.
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Fernando SotoRetiredCommented:
Imports System.Xml.Linq

and is found in the dll System.Xml.Linq.dll
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vcharlesAuthor Commented:
Hi,

It worked perfectly.

Thanks,

Victor
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Fernando SotoRetiredCommented:
Not a problem, glad to help.
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vcharlesAuthor Commented:
Hi Fernando,

I am receiving error message  "Object reference not set to an instance of an object." on line:
 Join n2 In f2.Descendants("Table1") On n1.Element("SN").Value Equals n2.Element("SN").Value
and n2.Element("SN").Value  is highlighted as specific cause of error.

which I think is because some records don't have any matching values, for example file1 may have an SN where there is no matching SN in file 2.

How do I avoid this error?

Thanks,

Victor
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Fernando SotoRetiredCommented:
Hi Victor;

Please open a new question for this. You can post here the link to the new post and I will have a look. In your new post please post sample xml files that cause the specific error.

Thanks.
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vcharlesAuthor Commented:
OK. Will do.

Thanks,

Victor
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