XElement Add function adds xmlns="" to the XElement
I have a function which generates xml for a list object:
public XDocument ToXML()
{
foreach (var row in this)
{
var xml = row.ToXml();
template.Root.Add(xml);
}
return template;
}
The template.ToString() reads: <RootElement xmlns="urn:testTools">
The xml reads: <Example><SubElement>testData</SubElement></Example>
After the add function has executed the template.ToString()开发者_如何学运维 reads: <RootElement xmlns="urn:testTools"><Example xmlns=""><SubElement>testData</SubElement></Example>
So for some reason there was an empty namespace added, how can i prevent it from doing so?
Here is an example that outputs xml without empty namespaces. Notice the bizarre Linq-centric syntax rootNamespace + "MyElementName", which is the secret. This is the same namespace as the whole document, thus no xmlns addition is necessary. This is concatenating an XNamespace + a string, which is a "+" overload that works for Linq and that Linq knows how to deal with. (Without Linq it could be a compile error to concatenate a string and a non string type). Note this was executed against a C# project file which is a handy Xml file. Output it to a console or a richtextbox control. Then take out the "rootNamespace +" and notice the difference.
XDocument doc = null;
using (StreamReader streamReader =
new StreamReader(@"myXml.csproj"))
{
doc = XDocument.Load(streamReader, LoadOptions.None);
}
XNamespace rootNamespace = doc.Root.Name.NamespaceName;
// A search which finds the ItemGroup which has Reference
// elements and returns the ItemGroup XElement.
XElement element = doc.Descendants().Where(p => p.Name.LocalName == "ItemGroup"
&& p.Descendants().First<XElement>().Name.LocalName == "Reference").First<XElement>();
// Create a completly new element with sub elements.
XElement referenceElement = new XElement(rootNamespace + "Reference",
new XElement(rootNamespace + "SpecificVersion", bool.FalseString),
new XElement(rootNamespace + "HintPath", "THIS IS A HINT PATH"));
// Add the new element to the main doc, to the end of the Reference elements.
element.Add(referenceElement);
// Add an attribute after the fact for effect.
referenceElement.SetAttributeValue("Include", "THIS IS AN INCLUDE");
rtb.Text = doc.ToString(SaveOptions.None);
Set the namespace on the Example and SubElement elements to the same as the RootElement. It is adding the xmlns="" to clear the namespace for these elements.
I solved it by replacing the elements with an regex. Foole's solution didn't work, because i didn't always now the exact namespace at that point in code.
So here's my dirty hack that works:
template = XDocument.Parse(new Regex("<ElementName.*>")
.Replace(template.ToString(SaveOptions.DisableFormatting), "<ElementName>"));
It could be that your root needs to be closed properly:
<RootElement xmlns="urn:testTools"> to <RootElement xmlns="urn:testTools"/>
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