XDocument parsing

Question

XDocument parsing

Noah Aas 1,210

Hello!

I have an XML document and I don't know how many more sub-elements there are. From Element SCANNER

How can I read this out intelligently?

<ROOT>
<PROGRAM>
    <NAME value="R5E9"/>
    <PRODUCT value="test"/>
    <PROGRAMMODES>
        <SCANNER text="Scan without stop" value="5">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>
            <ERRORHANDLING value="1" text="Errorhandling"/>
            <SEGMENT value="1" text="Segment"/>
//                further elements possible
        </SCANNER>
        <CAMERA text="Scanpanel" value="20">

My attempts

string currentProgram = material + "R5E9" + ".PROGRAM";
XDocument xDocProgram = XDocument.Load(currentProgram);
XElement elScanner = xDocProgram.XPathSelectElements("//PROGRAMMODES//SCANNER").FirstOrDefault();

if (elScanner != null)
{
	string text = elScanner?.Attribute("text").Value;
	string value = elScanner?.Attribute("value").Value;
	string errorhandling = elScanner?.Element("ERRORHANDLING").Attribute("value").Value;
}
else
{

}

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Answer 1

Viorel 126.9K

For example:

var elements = elScanner.XPathSelectElements( "*[@text][@value]" );
foreach( XElement element in elements )
{
    string name = element.Name.LocalName;
    string text = element.Attribute( "text" ).Value;
    string value = element.Attribute( "value" ).Value;

    Console.WriteLine( "Element: {0}, Text: {1}, Value: {2}", name, text, value );
}

Noah Aas 1,210

Thanks for the quick response.

<SCANNER text="Scan without stop" value="5">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>
            <ERRORHANDLING value="1" text="Errorhandling"/>
            <SEGMENT value="1" text="Segment"/>

It would be ideal if I could put this in a dictionary. Is that possible too?

Master SCANNER is a class with member/property Object {value and text)

Detail

Key=DEVICE  Value= Object {value and text)
Key=ERRORHANDLING  Value= Object {value and text)
Key=SEGMENT  Value= Object {value and text)

Viorel 126.9K

You should choose the data types or show details about your data.

For example:

class Data
{
    public string Text { get; set; }
    public string Value { get; set; }
}
        
. . .

Dictionary<string, Data> dictionary = new Dictionary<string, Data>( );

var elements = elScanner.XPathSelectElements( "*[@text][@value]" );
foreach( XElement element in elements )
{
    string name = element.Name.LocalName;
    string text = element.Attribute( "text" ).Value;
    string value = element.Attribute( "value" ).Value;

    dictionary[name] = new Data { Text = text, Value = value };
}

Noah Aas 1,210

Looks good! Thanks again.

Last question.

<PROGRAM>
    <NAME value="R5E9"/>
    <PRODUCT value="test"/>
    <PROGRAMMODES>
        <SCANNER text="Scan without stop" value="5">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>
...
        <SCANNERA text="Scan without stop" value="77">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>
...
        <SCANNERB text="Scan without stop" value="44">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>
...
        <PRINTER text="HP 3422" value="33">
            <DEVICE value="Scanner 1, SCANNER_1" text="Device"/>

( "*[@text][@value]" )

How can I go specifically to the element? Then I have a list?

Or is * all? Can I say here excatly the element?

Viorel 126.9K Reputation points

2024-04-16T19:07:20.4433333+00:00

In above example, “*” finds the child elements of elScanner.

If other data are needed, then describe the problem and the expected objects more detailed.
Noah Aas 1,210 Reputation points

2024-04-16T19:22:01.1633333+00:00
Thanks!

If I have several elements where text and value occur. How can I point to the exact element I want to find?

( "SCANNERA[@text][@value]" ) --> ?? right?

Alternatively, I have a list then, do I see that correctly?

SCANNER

SCANNERA

SCANNERB

PRINTER
( "*[@text][@value]" )

Maybe you can give an example.
Viorel 126.9K Reputation points

2024-04-16T19:59:13.0333333+00:00

To find the exact element, use its name instead of “*”.

You can use a simpler expression — "SCANNERA" instead of "SCANNERA[@text][@value]" — if the presence of text and value attributes is not important. The name can be got from the list inside a loop.
Noah Aas 1,210 Reputation points

2024-04-17T02:52:52.1366667+00:00

Ok and thank you very much for your help.

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XDocument parsing

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