Knowledge Base Nr: 00291 xmlxpath.cs - http://www.swe-kaiser.de

.net: xml: c#: search xml nodes with xpath

  
public void SearchNodes(string searchString, bool bCaseSensitive, bool bExactMatch, bool bSearchTree, bool bSearchProperties)
{
    this.Cursor = Cursors.WaitCursor;

    if (lastFileName == "")
        return;

    //save changes before search?
    if (configurationChanged == true)
    {
        DialogResult res = MessageBox.Show("You have made changes. Do you want to save before searching?", "Save Changes", MessageBoxButtons.YesNo);
        if (res == DialogResult.Yes)
        {
            SaveFibex(lastFileName);
        }
    }

    XPathDocument doc = new XPathDocument(lastFileName);

    XPathNavigator nav = ((IXPathNavigable)doc).CreateNavigator();
    XmlNamespaceManager man = new XmlNamespaceManager(nav.NameTable);

    man.AddNamespace("fx", "http://www.asam.net/xml/fbx");
    man.AddNamespace("flexray", "http://www.asam.net/xml/fbx/flexray");
    man.AddNamespace("lin", "http://www.asam.net/xml/fbx/lin");
    man.AddNamespace("can", "http://www.asam.net/xml/fbx/can");
    man.AddNamespace("ho", "http://www.asam.net/xml");
    man.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
    man.AddNamespace("xs", "http://www.asam.net/xml/fbx/all http://www.asam.net/xml/fbx/1_2_0a/xsd/fibex4multiplatform.xsd");

    searchResultsDlg.InitSearchResult();

    if (bSearchTree)
    {
        XPathExpression query = nav.Compile("//*[@ID|@ID-REF]");
        query.SetContext(man);

        XPathNodeIterator iter = nav.Select(query);

        bool bIsSameID = false;
        bool bIsSameIDRef = false;
        string elementid = "";
        string lastelementid = "";
        while (iter.MoveNext())
        {
            if (bCaseSensitive)
            {
                if (bExactMatch)
                {
                    bIsSameID = (iter.Current.GetAttribute("ID", "") == searchString);
                    bIsSameIDRef = (iter.Current.GetAttribute("ID-REF", "") == searchString);
                }
                else
                {
                    bIsSameID = (iter.Current.GetAttribute("ID", "").IndexOf(searchString)) >= 0;
                    bIsSameIDRef = (iter.Current.GetAttribute("ID-REF", "").IndexOf(searchString)) >= 0;
                }
            }
            else
            {
                if (bExactMatch)
                {
                    bIsSameID = (iter.Current.GetAttribute("ID", "").ToLower() == searchString.ToLower());
                    bIsSameIDRef = (iter.Current.GetAttribute("ID-REF", "").ToLower() == searchString.ToLower());
                }
                else
                {
                    bIsSameID = (iter.Current.GetAttribute("ID", "").ToLower().IndexOf(searchString.ToLower())) >= 0;
                    bIsSameIDRef = (iter.Current.GetAttribute("ID-REF", "").ToLower().IndexOf(searchString.ToLower())) >= 0;
                }
            }

            if (bIsSameID || bIsSameIDRef)
            {
                SearchNode nodeInfo = new SearchNode();

                XPathNodeIterator newIter = iter.Current.SelectAncestors(XPathNodeType.Element, true);
                bool bFirst = true;
                while (newIter.MoveNext())
                {
                    string elementName = newIter.Current.LocalName;
                    nodeInfo.arPath.Insert(0, elementName);
                    elementid = newIter.Current.GetAttribute("ID", "");

                    nodeInfo.arInfo.Insert(0, elementid);

                    if (elementid == "")
                        elementid = lastelementid;
                    nodeInfo.arIds.Insert(0, elementid);
                    lastelementid = elementid;

                    if (bFirst)
                    {
                        nodeInfo.search = searchString;
                        nodeInfo.bIsIDREF = bIsSameIDRef;
                        bFirst = false;
                    }
                }

                searchResultsDlg.AddSearchResult(this, nodeInfo);
            }
        }
    }

    if (bSearchProperties)
    {
        XPathExpression query;

        if (bCaseSensitive)
        {
            if (bExactMatch)
                query = nav.Compile("//*[*='" + searchString + "']");
            else
                query = nav.Compile("//*[contains(*,'" + searchString + "')]");
        }
        else
        {
            if (bExactMatch)
                query = nav.Compile("//*[translate(*, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')='" + searchString.ToLower() + "']");
            else
                query = nav.Compile("//*[contains(translate(*, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'),'" + searchString.ToLower() + "')]");
        }

        query.SetContext(man);

        XPathNodeIterator iter = nav.Select(query);

        string lastelementid = "";
        while (iter.MoveNext())
        {
            SearchNode nodeInfo = new SearchNode();
            XPathNodeIterator newIter = iter.Current.SelectAncestors(XPathNodeType.Element, true);
            bool bFirst = true;
            while (newIter.MoveNext())
            {
                string elementName = newIter.Current.LocalName;
                nodeInfo.arPath.Insert(0, elementName);

                string elementid = newIter.Current.GetAttribute("ID", "");

                nodeInfo.arInfo.Insert(0, elementid);

                if (elementid == "")
                    elementid = lastelementid;
                nodeInfo.arIds.Insert(0, elementid);
                lastelementid = elementid;

                if (bFirst)
                {
                    nodeInfo.search = elementid;
                    nodeInfo.bIsIDREF = false;
                    bFirst = false;
                }
            }

            searchResultsDlg.AddSearchResult(this, nodeInfo);
        }
    }

    this.Cursor = Cursors.Default;
}