Below is some code that use to work. Now it is not and I have yet to figure out why. I want to select the nodes to a nodelist and remove them from the dom. The only thing I can figure is it broke when I added my schema.

XML

<?xml version="1.0" encoding="utf-8"?><IADSNOTES xmlns="notes.xsd" count="4"><Note href="D:\V4.0\DEMO\IADS_4_0.sgm#IADS V4.0 TOC@0" csm="0"><User>Ralph</User><Title>IADS 4.0 Demo - Table of Contents</Title><Text>Ralph's good note</Text></Note><Note href="D:\V4.0\DEMO\IADS_4_0.sgm#IADS V4.0 TOC@0" csm="0"><User>Ralph</User><Title>IADS 4.0 Demo - Table of Contents</Title><Text>RAlph's duplicate user</Text></Note><Note href="D:\V4.0\DEMO\IADS_4_0.sgm#IADS V4.0 TOC@0" csm="0"><User>RALPH</User><Title>IADS 4.0 Demo - Table of Contents</Title><Text>RALPH duplicate another way</Text></Note><Note href="D:\IADS\DEMO\IADS_4_0.sgm#GENENTITIES@0" csm="0"><User>Joe</User><Title>GENENTITIES</Title><Text>Frame 2 Public Note</Text></Note></IADSNOTES>

I am wanting to delete "joe" in a test.


Here is the C# code.


XmlNode parentNode;
XmlNodeList nodeList;

XmlDataDocument myXmlDataDocument = new XmlDataDocument();
XmlElement root = myXmlDataDocument.DocumentElement;

// lets see if a note file exits
string strNoteFile = string.Concat(strIadsPath, "\\Notes\\Public.udn");
FileInfo FI = new FileInfo(strNoteFile);
if(!FI.Exists)
return true;

FileStream FS = new FileStream(strNoteFile, FileMode.Open, FileAccess.Read, FileShare.Read);

StreamReader myStreamReader = new StreamReader(FS);
try
{
myXmlDataDocument.Load(myStreamReader);
}
catch(Exception ioe)
{
MessageBox.Show(ioe.Message.ToString(), "IADS Admin", MessageBoxButtons.OK,MessageBoxIcon.Error);
return false;
}
// set the root element

root = myXmlDataDocument.DocumentElement;

// since loop i/o is cheap we will pass through again
foreach (DataRow myDataRow in UserDeleteTbl.Rows)
{
if(myDataRow["Name"].ToString().IndexOf("Error") == -1)
{
// begin removing data
strFind = string.Concat("'",myDataRow["Name"].ToString(),"'");
strTemp = string.Concat("/IADSNOTES/Note[User = ",strFind,"]");
nodeList = root.SelectNodes(strTemp); // Node list of everything entered
for(i = 0; i < nodeList.Count; i++)
{
parentNode = nodeList.Item(i).ParentNode;
if(parentNode != null) //Make sure parent is good
{
if(parentNode.HasChildNodes) // lets check for sure
{
try
{
parentNode.RemoveChild(nodeList.Item(i)); // remove Note
iNotesDeleted++; // count how many we delete
}
catch(Exception er)
{
MessageBox.Show(er.Message.ToString());
return false;
}
}
}
} // end of looping through items and removing them.

}
}

"Bob" <anonymous (AT) discussions (DOT) microsoft.com> wrote

Technically, you haven't added a schema, only declared a default namespace.
As you've discovered, this can break the XPath expression if the instance
document had previously not used a namespace.

: :
While evidently not the problem, remember that XPath expressions
are case-sensitive. "Joe" exists in the instance document, but "joe"
does not.

: :
Immediately before these two lines of code, you must declare an
XmlNamespaceManager and associate a prefix, for instance, "ns".

XmlNamespaceManager xmlNs = new XmlNamespaceManager(
myXmlDataDocument.NameTable);
xmlNs.AddNamespace( "ns", "notes.xsd");

Then use this prefix in the XPath expression,

strFind = string.Concat("'",myDataRow["Name"].ToString(),"'");
strTemp = string.Concat("/ns:IADSNOTES/ns:Note[ns:User = ",strFind,"]");

It's necessary to use a prefix in the XPath expression, because an
empty string cannot be used as a prefix. As long as the underlying
namespace URI matches, what prefix is chosen for the XPath
Expression doesn't matter.


Derek Harmon

I am sorry I simply mistyped "joe". I tried what you mentioned with the namespace manager and now I am a little further. It appears to be throwing an exception.

"Namespace Manager or XsltContext needed. This query has a prefix, variable, or user-defined function."

The only place I can find an explination for this is on a newsgroup that only responds in german and I wish I could read the german.

Here is what I have now

// set the name space manager
XmlNamespaceManager xmlns = new XmlNamespaceManager(myXmlDataDocument.NameTable);
xmlns.AddNamespace("ns", "notes.xsd");

// set the root element
root = myXmlDataDocument.DocumentElement;


// since loop i/o is cheap we will pass through again
foreach (DataRow myDataRow in UserDeleteTbl.Rows)
{
if(myDataRow["Name"].ToString().IndexOf("Error") == -1)
{
// begin removing data
strFind = string.Concat("'",myDataRow["Name"].ToString(),"'");
strTemp = string.Concat("/ns:IADSNOTES/ns:Note[ns:User = ",strFind,"]");
try
{
nodeList = root.SelectNodes(strTemp); // Node list of everything entered
for(i = 0; i < nodeList.Count; i++)
{
parentNode = nodeList.Item(i).ParentNode;
if(parentNode != null) //Make sure parent is good
{
if(parentNode.HasChildNodes) // lets check for sure
{
try
{
parentNode.RemoveChild(nodeList.Item(i)); // remove Note
iNotesDeleted++; // count how many we delete
}
catch(Exception er)
{
MessageBox.Show(er.Message.ToString());
return false;
}
}
}
} // end of looping through items and removing them.
}
catch(Exception iob)
{
iob.Message.ToString();
}

}

"Bob" <anonymous (AT) discussions (DOT) microsoft.com> wrote

Use the Namespace Manager,

nodeList = root.SelectNodes( strTemp, xmlns);


Derek Harmon