Global namespace URI replacement

[Chris Bray]

Hello all,

I am trying to globally replace all namespace URIs in an XML document.
I have tried using XmlNamespaceManager to do this, but have not had any
success. I don't want to do a simple string replacement on the
original text, as the URI may be referenced in a text node, which I
would not want to replace. Short of regenerating the document node by
node, is there any way to do this?

Thanks!

Chris Bray

[Oleg Tkachenko [MVP]]

Chris Bray wrote:

I am trying to globally replace all namespace URIs in an XML document.
I have tried using XmlNamespaceManager to do this, but have not had any
success. I don't want to do a simple string replacement on the
original text, as the URI may be referenced in a text node, which I
would not want to replace. Short of regenerating the document node by
node, is there any way to do this?

1. Custom XmlReader, which exposes different namespace - the most
efficient way.
2. Custom XmlWriter, which writes XML with different namespace - simpler
to implement than XmlReader, but requires to write XML down to bytes.
3. XSLT - the simplest way, not necessarily the best perf.

--
Oleg Tkachenko [XML MVP]
http://blog.tkachenko.com

[Chris Bray]

Thanks! I'll give those a try.

[Oleg Tkachenko [MVP]]

Chris Bray wrote:

Thanks! I'll give those a try.

Don't hesitate to ask here for any additional help on that.

--
Oleg Tkachenko [XML MVP]
http://blog.tkachenko.com

[Chris Bray]

Oleg,

Using a custom XmlReader worked great. Here is my code for anyone who
has the same problem:

/// <summary>
/// Summary description for XmlSubstitutionReader.
/// </summary>
public class XmlSubstitutionReader : XmlTextReader
{
#region Fields

private Hashtable pSubstitutions;

#endregion

#region Constructors

public XmlSubstitutionReader(Stream manifest) : base(manifest)
{
this.pSubstitutions = new Hashtable();
}

#endregion

#region AddSubstitution

public void AddSubstitution(string oldValue, string newValue)
{
if (this.pSubstitutions.ContainsKey(oldValue))
{
throw new ApplicationException("The provided value is already
configured for substitution.");
}
else
{
this.pSubstitutions.Add(oldValue, newValue);
}
}

#endregion

#region DoSubstitutions

private string DoSubstitutions(string value)
{
string v = value;

if ((value != null) && (value != string.Empty))
{
foreach (string s in this.pSubstitutions.Keys)
{
v = v.Replace(s, (string) this.pSubstitutions[s]);
}
}

return v;
}

#endregion

#region NamespaceURI

public override string NamespaceURI
{
get
{
return this.DoSubstitutions(base.NamespaceURI);
}
}

#endregion

#region Value

public override string Value
{
get
{
return this.DoSubstitutions(base.Value);
}
}

#endregion