Find an xml node

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  • Marco Trapanese
    #1

    Find an xml node

    Hello,

    I have a xml file like this:

    <book id='1'>
    <name></name>
    <author></author>
    ...
    </book>

    <book id='2'>
    ...
    </book>

    <book id='3'>
    ...
    </book>

    ....


    How to find the book with attribute id = '2' without cycle all nodes?

    Thanks!
    Marco / iw2nzm
    Tags: None
    • Joe Cool
      #2
      Re: Find an xml node

      On Sat, 29 Mar 2008 18:00:38 GMT, Marco Trapanese
      <marcotrapanese NOSPAM@gmail.co mwrote:
      >Hello,
      >
      >I have a xml file like this:
      >
      ><book id='1'>
      > <name></name>
      > <author></author>
      > ...
      ></book>
      >
      ><book id='2'>
      > ...
      ></book>
      >
      ><book id='3'>
      > ...
      ></book>
      >
      >...
      >
      >
      >How to find the book with attribute id = '2' without cycle all nodes?
      Can't do it, as far I am aware. You will have to restrieve a NodeList
      on book, then cycle through the nodes looking for the first one that
      has an attribute of id with the value of 2.

      Well , technically, you are not cycling thorugh all nodes, since the
      one you are looking far, at least in this example, is the second one.
      But you will need to first retrieve the entire list of book nodes with
      a SelectNodes method invocation.

      Besides, by this time you have the entire XML file in memory anyway
      from the DOM Load method.

        Comment

        • rowe_newsgroups
          #3
          Re: Find an xml node

          On Mar 29, 2:00 pm, Marco Trapanese <marcotrapanese NOS...@gmail.co m>
          wrote:
          Hello,
          >
          I have a xml file like this:
          >
          <book id='1'>
                  <name></name>
                  <author></author>
                  ...
          </book>
          >
          <book id='2'>
                  ...
          </book>
          >
          <book id='3'>
                  ...
          </book>
          >
          ...
          >
          How to find the book with attribute id = '2' without cycle all nodes?
          >
          Thanks!
          Marco / iw2nzm
          It would be possible to find the element using a string search, but it
          would be very difficult to find the matching end element without some
          serious Regex overhead. Then you would be able to load the string you
          found into memory as xml and parse it normally. I seriously doubt this
          would give you better performance, and would be a huge pain to
          maintenance.

          Why exactly are you afraid to loop through the nodes?

          Thanks,

          Seth Rowe [MVP]

            Comment

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