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.NET Forum / Languages / C# / March 2008XML Tree with more than one root
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 > 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.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk 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 I just stumbled upon this. http://www.java2s.com/Code/CSharp/GUI-Windows-Form/TreeViewDataBinding.htm >> Can someone show me a sample on how to save >> and load an xml tree with multiple roots? Most [quoted text clipped - 8 lines] > If you want to fake having more than that, put multiple elements under > a single genuine root element. > 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. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk 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 >> I just stumbled upon this. >> [quoted text clipped - 4 lines] > certainly won't be an XML document with multiple root elements, as such > a thing doesn't exist. > 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. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk 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. -- Arto Viitanen > 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. SignatureMartin Honnen --- MVP XML http://JavaScript.FAQTs.com/ Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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