Develop Reference

Correct way to add a namespace to an element using XmlDocument

I have to modify a incoming SOAP XML message to add a namespace to one of the elements so that the deserialisation will work. However when I add the xmlns attribute to the correct element, I get an error when I try to load the xml in to an XmlWriter via a stream (which I need to do to in my IClientMessageInspector implementation to replace the Message reply).
The prefix '' cannot be redefined from '' to 'http://www.example.com' within the same start element tag.
I have a work around, which is that after I've modifed the attribute, I reload the entire XML document from it's own OuterXML. This works for some reason, but makes me think there must be a 'correct' way to do this.
Here's a sample test that demonstrates the problem and my current solutions:
[Test]
public void XmlNamespaceTest()
{
var originalXmlString = "<?xml version=\"1.0\" encoding=\"utf-8\"?><TestElement><Child>thing</Child></TestElement>";
var desiredXmlString = "<?xml version=\"1.0\" encoding=\"utf-8\"?><TestElement xmlns=\"http://www.example.com\"><Child>thing</Child></TestElement>";
var doc = new XmlDocument();
doc.LoadXml(originalXmlString);
Assert.That(originalXmlString, Is.EqualTo(doc.OuterXml));
// Write this document via an XMLWriter
var ms = new MemoryStream();
var xmlWriter = XmlWriter.Create(ms);
doc.WriteTo(xmlWriter);
xmlWriter.Flush();
ms.Position = 0;
StreamReader sr = new StreamReader(ms);
var originalXmlViaXmlWriter = sr.ReadToEnd();
Assert.That(originalXmlString, Is.EqualTo(originalXmlViaXmlWriter));
// Add the namespace to the element
((XmlElement)doc.GetElementsByTagName("TestElement").Item(0))?.SetAttribute("xmlns", "http://www.example.com");
Assert.That(desiredXmlString, Is.EqualTo(doc.OuterXml));
// Now attempt to write this modified xml via an XMLWriter
ms.SetLength(0);
xmlWriter = XmlWriter.Create(ms);
//Uncomment line below to fix the error.
//doc.LoadXml(doc.OuterXml);
doc.WriteTo(xmlWriter);
xmlWriter.Flush();
ms.Position = 0;
sr = new StreamReader(ms);
var modifedXmlViaXmlWriter = sr.ReadToEnd();
Assert.That(desiredXmlString, Is.EqualTo(modifedXmlViaXmlWriter));
}

According to this you can't change an elements namespace in an XmlDocument. This is also what #LocEngineer found in his comment. The referenced article mentions that the only way to do this is to save and reload the XmlDocument, which is exactly what you are doing.
If you are in a position to use XDoxument instead, it is possible. See this answer for a solution.

Advantages of linq-to-xml compared to OfficeOpenXML.WordProcessing namespace

I'm working on an application that needs to generate Word documents based on user input, database values and a template. I've looked online for examples, and found many different approaches to generate word documents but I've made up my mind and decided to stick with the official Office Open XML SDK 2.5. Now I've just written a simple program that inserts a table (stored in a .xml file) into a word document:
Edit: Question down at the bottom if not interested in the code
static void Main(string[] args)
{
XNamespace ns = XNamespace
.Get(#"http://schemas.openxmlformats.org/wordprocessingml/2006/main");
byte[] byteArray = File.ReadAllBytes(#"C:/Users/Alexander/Downloads/WordTest.docx");
using (var stream = new MemoryStream())
{
XDocument xdoc;
stream.Write(byteArray, 0, byteArray.Length);
using (WordprocessingDocument doc = WordprocessingDocument.Open(stream, true))
{
Then I can do 2 different things which will generate the same output.
1) Using OfficeOpenXml.Wordprocessing namespace methods:
#region Openxml.WordProcessing
var paragraphs = doc.MainDocumentPart.Document.Body.ToList();
Table tbl = new Table(File.ReadAllText(#"C:/users/alexander/downloads/tablecontent.xml"));
var bookmark = paragraphs.SelectMany(p => p.Descendants<BookmarkStart>()
.Where(bm => bm.Id == "0")).FirstOrDefault();
doc.MainDocumentPart.Document.Body.ReplaceChild(tbl, bookmark.Parent);
#endregion Openxml.WordProcessing
2) Using Linq-To-XML:
#region LINQ TO XML
XElement xtbl = XElement.Load(
new FileStream(#"C:/users/alexander/downloads/tablecontent.xml", FileMode.Open));
using (StreamReader sr = new StreamReader(doc.MainDocumentPart.GetStream()))
using (XmlReader xr = XmlReader.Create(sr))
xdoc = XDocument.Load(xr);
//Document - Body - Paragraphs - Runs/Bookmarks/etc.
//any way to write this more clearly in linq-to-xml?
var test = xdoc.Elements().First().Elements().First().Elements()
.SelectMany(e => e.Elements()).ToList();
var startBookmark = test.Where(p => p.Name == XName.Get("bookmarkStart", ns.NamespaceName)
&& p.Attribute(XName.Get("id", ns.NamespaceName)).Value == "0").First();
startBookmark.Parent.ReplaceWith(xtbl);
using (XmlWriter xw = XmlWriter.Create(doc.MainDocumentPart.GetStream()))
xdoc.Save(xw);
#endregion LINQ TO XML
And finally I write the document to a new file:
using (FileStream fs =
new FileStream(#"C:/users/alexander/downloads/WordTestModified.docx", FileMode.Create))
{
stream.WriteTo(fs);
}
As far as I see it, the first option is easier and the code is more clear to read, (no use of XName and no need for extra StreamReader/XmlReader/Writer) but are there any distinct advantages Linq-to-xml has over this approach? This is going to be a big application and I don't want to be limited later on.

XMLPrime XLST.Compile throwing a null exception

public static SqlXml XMLPrimeTransform(SqlXml inputDataXML, SqlXml inputTrasnformXML)
{
MemoryStream ms = new MemoryStream();
XmlReader inxml = inputDataXML.CreateReader();
XmlReader intrans = inputTrasnformXML.CreateReader();
XmlReaderSettings xmlreadersettings = new XmlReaderSettings { NameTable = intrans.NameTable };
XdmDocument document= new XdmDocument(inxml);
XmlPrime.XsltSettings xsltSettings = new XmlPrime.XsltSettings(intrans.NameTable) { ContextItemType = XdmType.Node };
var xslt = Xslt.Compile(intrans, xsltSettings);
//var xslt = Xslt.Compile(inputTrasnformXML.CreateReader());
var contextItem = document.CreateNavigator();
var settings = new DynamicContextSettings { ContextItem = contextItem };
xslt.ApplyTemplates(settings, ms);
return new SqlXml(ms);
}
I wrote the above code function to apply a xlst 2.0 stylesheet to xml and return the XML.
I tried to modify the XMLPrime example, but for some reason the line:
var xslt = Xslt.Compile(intrans, xsltSettings);
is throwing a NullReferenceException. Both intrans and xsltSettings are not null. Anyone have any luck trying to accomplish this with XMLPrime or any other library?

It may be a bug specific to the stylesheet you are loading. Try using a minimal stylesheet to see if that is the case. If you think it is a bug in XmlPrime, contact the developers and supply a Visual Studio solution which reproduces the problem.

How to use XmlDocument object instead of reading XML file from drive?

I didn't know that I can use XSD schema to serialize received XML file. I used xsd.exe to generate cs class from XSD file and now I need to use that class to get data in class properties but I miss one thing and I need help.
This is the code:
private void ParseDataFromXmlDocument_UsingSerializerClass(XmlDocument doc)
{
XmlSerializer ser = new XmlSerializer(typeof(ClassFromXsd));
string filename = Path.Combine("C:\\myxmls\\test", "xmlname.xml");
ClassFromXsdmyClass = ser.Deserialize(new FileStream(filename, FileMode.Open)) as ClassFromXsd;
if (myClass != null)
{
// to do
}
...
Here I use XML file from drive. And I want to use this XmlDocument from parameter that I passed in. So how to adapt this code to use doc instead XML from drive?

You could write the XmlDocument to a MemoryStream, and then Deserialize it like you already did.
XmlDocument doc = new XmlDocument();
ClassFromXsd obj = null;
using (var s = new MemoryStream())
{
doc.Save(s);
var ser = new XmlSerializer(typeof (ClassFromXsd));
s.Seek(0, SeekOrigin.Begin);
obj = (ClassFromXsd)ser.Deserialize(s);
}

Dataset -> XML Document - Load DataSet into an XML Document - C#.Net

I'm trying to read a dataset as xml and load it into an XML Document.
XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
//XmlWriterSettings xmlWSettings = new XmlWriterSettings();
//xmlWSettings.ConformanceLevel = ConformanceLevel.Auto;
using (XmlWriter xmlW = XmlWriter.Create(ms))
{
xmlW.WriteStartDocument();
dsContract.WriteXmlSchema(xmlW);
xmlW.WriteEndDocument();
xmlW.Close();
using (XmlReader xmlR = XmlReader.Create(ms))
{
contractHistoryXMLSchemaDoc.Load(xmlR);
}
}
}
But I'm getting the error - "Root Element Missing".
Any ideas?
Update
When i do xmlR.ReadInnerXML() it is empty. Does anyone know why?
NLV

A few things about the original code:
You don't need to call the write start and end document methods: DataSet.WriteXmlSchema produces a complete, well-formed xsd.
After writing the schema, the stream is positioned at its end, so there's nothing for the XmlReader to read when you call XmlDocument.Load.
So the main thing is that you need to reset the position of the MemoryStream using Seek. You can also simplify the whole method quite a bit: you don't need the XmlReader or writer. The following works for me:
XmlDocument xd = new XmlDocument();
using(MemoryStream ms = new MemoryStream())
{
dsContract.WriteXmlSchema(ms);
// Reset the position to the start of the stream
ms.Seek(0, SeekOrigin.Begin);
xd.Load(ms);
}

XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
dsContract.WriteXml(ms);
ms.Seek(0, SeekOrigin.Begin);
using(XmlReader xmlR = XmlReader.Create(ms))
{
contractHistoryXMLSchemaDoc.Load(xmlR);
}
}

All you really need to do is to call contractHistoryXMLSchemaDoc.Save(ms). That will put the xml into the MemoryStream.
XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
contractHistoryXMLSchemaDoc.Save(ms);
ms.Flush();
}

Here you go.
If from the naming convention of your variables, (not though the question you asked, which appears to change...), you need to load the XML scema of the data set into the XML document that you named with schema, below is the code to load schema of the dataset into an XMLDocument.
I want the schema of the dataset in a separate XML document. – NLV Apr 19 '10 at 12:01
Answer:
XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
dsContract.WriteXmlSchema(ms);
ms.Seek(0, SeekOrigin.Begin);
contractHistoryXMLSchemaDoc.Load(ms);
}
If you are looking for how to load the dataset table data into an XML document (note I removed the word Schema from the XMLDocument variable name)
Your Question:
Sorry, i dont get you. I need to get the xml of that dataset into an xml document. – NLV Apr 19 '10 at 11:56
Answer:
XmlDocument contractHistoryXMLDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
dsContract.WriteXml(ms,XmlWriteMode.IgnoreSchema);
ms.Seek(0, SeekOrigin.Begin);
contractHistoryXMLDoc.Load(ms);
}
If you want the Schema and data set in separate documents, the code is above.
If you want just the schema or just the data in and xml document, use the above bit of code that pertains to your question.
If you want both the XML Schema and the Data in the same XMLDocument, then use this code.
XmlDocument contractHistoryXMLDoc = new XmlDocument();
using (MemoryStream ms = new MemoryStream())
{
dsContract.WriteXml(ms,XmlWriteMode.WriteSchema);
ms.Seek(0, SeekOrigin.Begin);
contractHistoryXMLDoc.Load(ms);
}
Your Question:
But I'm getting the error - "Root Element Missing".
Any ideas?
Update
When i do xmlR.ReadInnerXML() it is empty. Does anyone know why?
NLV
Answer:
There are underlying issues in your code in the way you think it is working, which means it is not really creating the XMLSchema and XmlData (dsContract), which is why you are seeing a blank XMLDocument.
It would probably help you to fully explain what you wish, and then not reply to everyone using partial sentences of which are misunderstood and your having to keep replying with more partial sentences.