XML Tree with more than one root

[John]

Can someone show me a sample on how to save
and load an xml tree with multiple roots? Most
trees have only one root node, but I want more
than one root. I know how to create one root,
but when it goes over that limit I don't know
what to do.

Appreciate any help.

John

 

[Jon Skeet [C# MVP]]

Can someone show me a sample on how to save
and load an xml tree with multiple roots? Most
trees have only one root node, but I want more
than one root. I know how to create one root,
but when it goes over that limit I don't know
what to do.

There's no such thing. An XML document by definition only has a single
root element.

If you want to fake having more than that, put multiple elements under
a single genuine root element.

 

[Marc Gravell]

True, but in addition to document there is also fragment:

http://msdn2.microsoft.com/en-us/library/6bts1x50.aspx

But most DOM representations (such as XmlDocument) won't let you use this
approach; "document" is by far the more correct approach.

Marc

 

[John]

I just stumbled upon this.

http://www.java2s.com/Code/CSharp/GUI-Windows-Form/TreeViewDataBinding.htm

 

[Jon Skeet [C# MVP]]

I just stumbled upon this.

http://www.java2s.com/Code/CSharp/GUI-Windows-Form/TreeViewDataBinding.htm

I'm unclear how that's related to your original question. Yes, that
example happens to use XML to load and save a data set, but it
certainly won't be an XML document with multiple root elements, as such
a thing doesn't exist.

 

[Martin Honnen]

Can someone show me a sample on how to save
and load an xml tree with multiple roots? Most
trees have only one root node, but I want more
than one root. I know how to create one root,
but when it goes over that limit I don't know
what to do.

XmlWriter with XmlWriterSettings and ConformanceLevel.Fragment allows
you to create a fragment with multiple root elements (respectively any
kind of top-level nodes) and XmlReader with XmlReaderSettings and
ConformanceLevel.Fragment allows you to read such fragments. Within the
..NET framework you can pass such an XmlReader to an XPathDocument to
then apply XPath. XmlDocument on the other hand does not allow that, it
needs a single root element to become its DocumentElement.

 

[John]

I guess basically I have to use some other storage format if I want
to use multiple roots.

Thanks guys, I don't want to make this more difficult than it is.

John

 

[Jon Skeet [C# MVP]]

I guess basically I have to use some other storage format if I want
to use multiple roots.

Well, you don't have to change much - just create a root element with
the appropriate subelements.

 

[Arto Viitanen]

John kirjoitti:

I guess basically I have to use some other storage format if I want
to use multiple roots.

Instead of one XML document, you could have a set of XML documents. I
guess this is how XML databases work.