Edit XML document

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  • gator
    #1

    Edit XML document

    Hello,

    I am trying to edit a specific node in an XML file using C#. I have
    searched around for example code to do this. The only solutions I
    have come across either add a new node to the doc or have me re-write
    the entire doccument ... is there a way to open the doc, edit only a
    specific node and then save the changes?

    Here is an example of an XML document:

    <?xml version="1.0"?>
    <inventory>
    <book>
    <title>The Godfather</title>
    <author>Mario Puzo</author>
    <publisher>Sign et</publisher>
    <genre>Crime Drama</genre>
    <price>$29.95 </price>
    <stock>5</stock>
    </book>
    </inventory>

    How would I change only the "stock" node to "4" and save the file?

    Thanks for your help,
    Steve
    Tags: None
    • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
      #2
      Re: Edit XML document

      gator wrote:
      I am trying to edit a specific node in an XML file using C#. I have
      searched around for example code to do this. The only solutions I
      have come across either add a new node to the doc or have me re-write
      the entire doccument ... is there a way to open the doc, edit only a
      specific node and then save the changes?
      >
      Here is an example of an XML document:
      >
      <?xml version="1.0"?>
      <inventory>
      <book>
      <title>The Godfather</title>
      <author>Mario Puzo</author>
      <publisher>Sign et</publisher>
      <genre>Crime Drama</genre>
      <price>$29.95 </price>
      <stock>5</stock>
      </book>
      </inventory>
      >
      How would I change only the "stock" node to "4" and save the file?
      Read the XML file into an XmlDocument, update the node and write it back
      to a file.

      Arne

        Comment

        • =?ISO-8859-1?Q?Arne_Vajh=F8j?=
          #3
          Re: Edit XML document

          Arne Vajhøj wrote:
          gator wrote:
          >I am trying to edit a specific node in an XML file using C#. I have
          >searched around for example code to do this. The only solutions I
          >have come across either add a new node to the doc or have me re-write
          >the entire doccument ... is there a way to open the doc, edit only a
          >specific node and then save the changes?
          >>
          >Here is an example of an XML document:
          >>
          ><?xml version="1.0"?>
          ><inventory>
          > <book>
          > <title>The Godfather</title>
          > <author>Mario Puzo</author>
          > <publisher>Sign et</publisher>
          > <genre>Crime Drama</genre>
          > <price>$29.95 </price>
          > <stock>5</stock>
          > </book>
          ></inventory>
          >>
          >How would I change only the "stock" node to "4" and save the file?
          >
          Read the XML file into an XmlDocument, update the node and write it back
          to a file.
          Simple code:

          XmlDocument doc = new XmlDocument();
          doc.Load(@"C:\i .xml");
          doc.SelectSingl eNode("//inventory/book/stock/text()").Value
          = "4";
          doc.Save(@"C:\o .xml");

          Arne

            Comment

            • gator
              #4
              Re: Edit XML document

              On Jun 21, 10:46 pm, Arne Vajhøj <a...@vajhoej.d kwrote:
              Arne Vajhøj wrote:
              gator wrote:
              I am trying to edit a specific node in an XML file using C#.  I have
              searched around for example code to do this.  The only solutions I
              have come across either add a new node to the doc or have me re-write
              the entire doccument ... is there a way to open the doc, edit only a
              specific node and then save the changes?
              >
              Here is an example of an XML document:
              >
              <?xml version="1.0"?>
              <inventory>
                  <book>
                      <title>The Godfather</title>
                      <author>Mario Puzo</author>
                      <publisher>Sign et</publisher>
                      <genre>Crime Drama</genre>
                      <price>$29.95 </price>
                      <stock>5</stock>
                  </book>
              </inventory>
              >
              How would I change only the "stock" node to "4" and save the file?
              >
              Read the XML file into an XmlDocument, update the node and write it back
              to a file.
              >
              Simple code:
              >
                           XmlDocument doc = new XmlDocument();
                           doc.Load(@"C:\i .xml");
                           doc.SelectSingl eNode("//inventory/book/stock/text()").Value
              = "4";
                           doc.Save(@"C:\o .xml");
              >
              Arne- Hide quoted text -
              >
              - Show quoted text -
              Arne,

              Yes! That's exactly what I needed. Thanks for the help AND the very
              quick response!!

              Steve

                Comment

                • Pavel Minaev
                  #5
                  Re: Edit XML document

                  On Jun 22, 6:37 am, gator <glb...@gmail.c omwrote:
                  Hello,
                  >
                  I am trying to edit a specific node in an XML file using C#.  I have
                  searched around for example code to do this.  The only solutions I
                  have come across either add a new node to the doc or have me re-write
                  the entire doccument ... is there a way to open the doc, edit only a
                  specific node and then save the changes?
                  >
                  Here is an example of an XML document:
                  >
                  <?xml version="1.0"?>
                  <inventory>
                      <book>
                          <title>The Godfather</title>
                          <author>Mario Puzo</author>
                          <publisher>Sign et</publisher>
                          <genre>Crime Drama</genre>
                          <price>$29.95 </price>
                          <stock>5</stock>
                      </book>
                  </inventory>
                  >
                  How would I change only the "stock" node to "4" and save the file?
                  Note that the proposed solution still recreates the entire file when
                  Save() is called - if you have originally mentioned it because of some
                  performance requirements, then it might not be the one to seek.

                  Also, it loads the entire XML file into memory. Again, it most likely
                  doesn't matter, but for multimegabyte documents, using XmlReader/
                  XmlWriter combo, passing through all elements unchanged, and only
                  modifying the values you need, will be much more memory-efficient.

                    Comment

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