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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

Fernando Soto

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.

Victor Charles

ASKER

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>

Fernando Soto

OK, having the new file1.xml and the old file2.xml what should the new file2.xml look like.?

Carl Tawn

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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Victor Charles

ASKER

Hi,

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

Thanks,

Victor

Carl Tawn

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.

Victor Charles

ASKER

Hi,

I will try it and get back to you.

Thank You.

Victor

Fernando Soto

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?

Victor Charles

ASKER

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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Fernando Soto

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Victor Charles

ASKER

Thank You. I will try it and get back to you.

Victor Charles

ASKER

Hi,

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

V.

Fernando Soto

Imports System.Xml.Linq

and is found in the dll System.Xml.Linq.dll

Victor Charles

ASKER

Hi,

It worked perfectly.

Thanks,

Victor

Fernando Soto

Not a problem, glad to help.

Victor Charles

ASKER

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

Fernando Soto

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.

Victor Charles

ASKER

OK. Will do.

Thanks,

Victor