I'm trying to iterate through a set of nodes and then edit/delete
specific attributes using XPathNodeIterator. Adding attributes is no
problem.

My first question is how do I delete an attribute using an
XPathNodeIterator? Or should I be using something else?

In the sample that follows:
1. Grab all "Page" nodes.
2. Loop through all the nodes.
3. delete the "lastModified" attribute.
4. Will eventually just want to edit the "lastModified" attribute.

C#3/x
Sample method:
public void test()
{
XPathDocument doc = new XPathDocument( "pathToXML" );
XPathNavigator nav = doc.CreateNavigator();
XPathNodeIterator iterator = nav.Select( "//Section/Page" );
while( iterator.MoveNext() )
{
XPathNavigator node = iterator.Current;
string lastModifiedAttribute =
node.GetAttribute( "lastModified", "" );

// Actions will vary, but will consist of:
// 1. add attribute
// 2. delete attribute
// 3. edit attribute
}
}


Sample XML:
<?xml version="1.0"?>
<SiteMap>
<Section>
<Page nav="topic1" lastModified="20081005" />
<Page nav="topic2" lastModified="20081001" />
</Section>
<Section>
<Page nav="topic3" lastModified="20081002" />
<Section>
<Page nav="topic4" lastModified="20081004" />
<Section>
<Page nav="topic5" lastModified="20081003" />
<Page nav="topic6" lastModified="20081009" />
</Section>
</Section>
</Section>
<Section>
<Page nav="topic7" lastModified="20081012" />
<Page nav="topic8" lastModified="20081015" />
<Page nav="topic9" lastModified="20081007" />
</Section>
</SiteMap>


Thanks in advance!
::k::

Kindler Chase wrote:
> I'm trying to iterate through a set of nodes and then edit/delete
> specific attributes using XPathNodeIterator. Adding attributes is no
> problem.
>
> My first question is how do I delete an attribute using an
> XPathNodeIterator? Or should I be using something else?
>
> In the sample that follows:
> 1. Grab all "Page" nodes.
> 2. Loop through all the nodes.
> 3. delete the "lastModified" attribute.
> 4. Will eventually just want to edit the "lastModified" attribute.
>
> C#3/x
> Sample method:
> public void test()
> {
> XPathDocument doc = new XPathDocument( "pathToXML" );

First problem is that XPathDocument is read only !

You need to switch to XmlDocument. It should not be a
problem to do what you want on an XmlElement.

Arne

Arne Vajhøj wrote:
> Kindler Chase wrote:
>> I'm trying to iterate through a set of nodes and then edit/delete
>> specific attributes using XPathNodeIterator. Adding attributes is no
>> problem.
>>
>> My first question is how do I delete an attribute using an
>> XPathNodeIterator? Or should I be using something else?
>>
>> In the sample that follows:
>> 1. Grab all "Page" nodes.
>> 2. Loop through all the nodes.
>> 3. delete the "lastModified" attribute.
>> 4. Will eventually just want to edit the "lastModified" attribute.
>>
>> C#3/x
>> Sample method:
>> public void test()
>> {
>> XPathDocument doc = new XPathDocument( "pathToXML" );
>
> First problem is that XPathDocument is read only !
>
> You need to switch to XmlDocument. It should not be a
> problem to do what you want on an XmlElement.
>
> Arne

Sorry for the mis-post, it actually *is* an XmlDocument - when I wrote
up the example, I mis-typed.

The problem still remains - when iterating through the nodes with the
XPathNodeiterator, I am unable to delete an attribute. Can you post an
example of iterating through and deleting an attribute?

Thanks!
::k::

Arne Vajhøj wrote:
> Kindler Chase wrote:
>> I'm trying to iterate through a set of nodes and then edit/delete
>> specific attributes using XPathNodeIterator. Adding attributes is no
>> problem.
>>
>> My first question is how do I delete an attribute using an
>> XPathNodeIterator? Or should I be using something else?
>>
>> In the sample that follows:
>> 1. Grab all "Page" nodes.
>> 2. Loop through all the nodes.
>> 3. delete the "lastModified" attribute.
>> 4. Will eventually just want to edit the "lastModified" attribute.
>>
>> C#3/x
>> Sample method:
>> public void test()
>> {
>> XPathDocument doc = new XPathDocument( "pathToXML" );
>
> First problem is that XPathDocument is read only !
>
> You need to switch to XmlDocument. It should not be a
> problem to do what you want on an XmlElement.

Code snippet:

XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
doc.Save(Console.Out);
foreach(XmlNode n in doc.SelectNodes("//*[@lastModified]"))
{
n.Attributes.RemoveNamedItem("lastModified");
}

Arne

Kindler Chase wrote:
> Arne Vajhøj wrote:
>> Kindler Chase wrote:
>>> I'm trying to iterate through a set of nodes and then edit/delete
>>> specific attributes using XPathNodeIterator. Adding attributes is no
>>> problem.
>>>
>>> My first question is how do I delete an attribute using an
>>> XPathNodeIterator? Or should I be using something else?
>>>
>>> In the sample that follows:
>>> 1. Grab all "Page" nodes.
>>> 2. Loop through all the nodes.
>>> 3. delete the "lastModified" attribute.
>>> 4. Will eventually just want to edit the "lastModified" attribute.
>>>
>>> C#3/x
>>> Sample method:
>>> public void test()
>>> {
>>> XPathDocument doc = new XPathDocument( "pathToXML" );
>>
>> First problem is that XPathDocument is read only !
>>
>> You need to switch to XmlDocument. It should not be a
>> problem to do what you want on an XmlElement.
>
> Sorry for the mis-post, it actually *is* an XmlDocument - when I wrote
> up the example, I mis-typed.

Always copy paste the real code !

> The problem still remains - when iterating through the nodes with the
> XPathNodeiterator, I am unable to delete an attribute. Can you post an
> example of iterating through and deleting an attribute?

Just posted an example.

Arne

Arne Vajhøj wrote:
>> Sorry for the mis-post, it actually *is* an XmlDocument - when I wrote
>> up the example, I mis-typed.
>
> Always copy paste the real code !

Will do

>> The problem still remains - when iterating through the nodes with the
>> XPathNodeiterator, I am unable to delete an attribute. Can you post an
>> example of iterating through and deleting an attribute?
>
> Just posted an example.

Thanks for the post/example! I'll hit it again tomorrow.

::k::

Arne Vajhøj wrote:
> Code snippet:
>
> XmlDocument doc = new XmlDocument();
> doc.LoadXml(xml);
> doc.Save(Console.Out);
> foreach(XmlNode n in doc.SelectNodes("//*[@lastModified]"))
> {
> n.Attributes.RemoveNamedItem("lastModified");
> }

Thanks Arne! It's all sorted out now. Appreciate your help.

::k::