Hello eXavier,
Welcome to Microsoft Newsgroup Support service. My name is Lingzhi Sun
[MSFT]. I am very pleased to work with you on this case.
The issue that you reported has been proven to be a product issue, which
can be found at this Microsoft Connect webpage:
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedba
ckID=122168. Here I'd like to analyze the cause of this problem and then
provide a workaround for you.
//////////////////////////
Cause of the problem:
The underlying reader used by XmlDocument (ie. XmlTextReader) does not
distinguish between a document with an empty internal subset and one with
no internal subset specified. In both cases the Value property for the
XmlTextReader is an empty string (""). When the XmlDocument.Save() method
is called, it will call XmlTextWriter.WriteDocType() method to write
document state of the XML file. I researched the codes of this method and
found that if a non-null value is passed to the parameter subset, the
XmlTextWriter writes [subset]; if a null value is passed, the XmlTextWriter
does not write anything. Therefore, if the XmlTextReader.Value is an
empty string ("") and it is passed to the parameter subset, we will get [""
(an empty string)] at the end of the document statement in the XML file.
/////////////////////////
Workaround:
To work around this issue, we can call XmlTextWriter.WriteDocType() method
to write document statement in the XML file instead of using
XmlDocument.Save(). For detail, please see the following code snippet:
/////////////////////////////////////////////
try
{
using (XmlTextReader reader = new XmlTextReader(@"dfs.xml"))
{
reader.XmlResolver = null;
using (XmlTextWriter writer = new XmlTextWriter(@"dfs2.xml",
Encoding.UTF8))
{
int num = (reader.NodeType == XmlNodeType.None) ? -1 : reader.Depth;
do
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
writer.WriteStartElement(reader.Prefix, reader.LocalName,
reader.NamespaceURI);
writer.WriteAttributes(reader, true);
if (reader.IsEmptyElement)
{
writer.WriteEndElement();
}
break;
case XmlNodeType.Text:
writer.WriteString(reader.Value);
break;
case XmlNodeType.CDATA:
writer.WriteCData(reader.Value);
break;
case XmlNodeType.EntityReference:
writer.WriteEntityRef(reader.Name);
break;
case XmlNodeType.ProcessingInstruction:
case XmlNodeType.XmlDeclaration:
writer.WriteProcessingInstruction(reader.Name, reader.Value);
break;
case XmlNodeType.Comment:
writer.WriteComment(reader.Value);
break;
case XmlNodeType.DocumentType:
if (reader.Value.Equals(string.Empty))
{
writer.WriteDocType(reader.Name, reader.GetAttribute("PUBLIC"),
reader.GetAttribute("SYSTEM"), null);
}
else
writer.WriteDocType(reader.Name, reader.GetAttribute("PUBLIC"),
reader.GetAttribute("SYSTEM"), reader.Value);
break;
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
writer.WriteWhitespace(reader.Value);
break;
case XmlNodeType.EndElement:
writer.WriteFullEndElement();
break;
}
}
while (reader.Read() && ((num < reader.Depth) || ((num ==
reader.Depth) && (reader.NodeType == XmlNodeType.EndElement))));
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
///////////////////////////////////////////////
If you have any questions, please be free to let me know. Have a nice day!
Regards,
Lingzhi Sun (
[email protected], remove 'online.')
Microsoft Online Community Support
Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).
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