How to add XML attribute in XML file in C#

Question

I am generating XML file from C# code but when I add attribute to XML node I am getting problem. Following is code.

XmlDocument doc = new XmlDocument();
XmlNode docRoot = doc.CreateElement("eConnect");
doc.AppendChild(docRoot);
XmlNode eConnectProcessInfo = doc.CreateElement("eConnectProcessInfo");
XmlAttribute xsiNil = doc.CreateAttribute("xsi:nil");
xsiNil.Value = "true";
eConnectProcessInfo.Attributes.Append(xsiNil);
docRoot.AppendChild(eConnectProcessInfo);

Result:

<eConnect>
    <eConnectProcessInfo nil="true"/>
</eConnect>

Expected Result:

<eConnect>
    <eConnectProcessInfo xsi:nil="true"/>
</eConnect>

XML attribute is not adding "xsi:nil" in xml file. Please help me for this, where I am going wrong.

Have you seen: stackoverflow.com/questions/2255311/…

Satpal
– Satpal

2013-07-01 10:24:47 +00:00
Commented Jul 1, 2013 at 10:24 — Satpal
– Satpal, Commented Jul 1, 2013 at 10:24
Just a hint: this is a lot easier with XLinq (XElement)

Henk Holterman
– Henk Holterman

2013-07-01 10:25:16 +00:00
Commented Jul 1, 2013 at 10:25 — Henk Holterman
– Henk Holterman, Commented Jul 1, 2013 at 10:25

Bob Vale · Accepted Answer · 2013-07-01 11:27:01Z

8

You need to add the schema to your document for xsi first

UPDATE you also need to add the namespace as an attribute to the root object

//Store the namespaces to save retyping it.
string xsi = "http://www.w3.org/2001/XMLSchema-instance";
string xsd = "http://www.w3.org/2001/XMLSchema";
XmlDocument doc = new XmlDocument();
XmlSchema schema = new XmlSchema();
schema.Namespaces.Add("xsi", xsi);
schema.Namespaces.Add("xsd", xsd);
doc.Schemas.Add(schema);
XmlElement docRoot = doc.CreateElement("eConnect");
docRoot.SetAttribute("xmlns:xsi",xsi);
docRoot.SetAttribute("xmlns:xsd",xsd);
doc.AppendChild(docRoot);
XmlNode eConnectProcessInfo = doc.CreateElement("eConnectProcessInfo");
XmlAttribute xsiNil = doc.CreateAttribute("nil",xsi);
xsiNil.Value = "true";
eConnectProcessInfo.Attributes.Append(xsiNil);
docRoot.AppendChild(eConnectProcessInfo);

edited Jul 1, 2013 at 11:27

answered Jul 1, 2013 at 10:39

Bob Vale

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3 Comments

user2493287 Over a year ago

This is not giving result: My expected result is ::: <eConnect xmlns:xsi="w3.org/2001/XMLSchema-instance" xmlns:xsd="w3.org/2001/XMLSchema"> <SOPTransactionType> <eConnectProcessInfo xsi:nil="true" /> <taRequesterTrxDisabler_Items xsi:nil="true" /> <taUpdateCreateItemRcd xsi:nil="true" /> </SOPTransactionType> </eConnect>

Bob Vale Over a year ago

@user2493287 Please see updated answer, I forgot to include the line that adds the xmlns attribute. I'm also slapping in the xsd namespace you want

Bob Vale Over a year ago

@user2493287 My answer doesn't include it, but your comment indicates that you need to create the SOPTransactionType> element before you add the eConnectProcessInfo

M. Fawad Surosh · Accepted Answer · 2019-12-24 14:45:03Z

2

Below is the simplest way to append an xsi:nil="true" element:

XmlNode element = null;
XmlAttribute xsinil = doc.CreateAttribute("xsi", "nil", "http://www.w3.org/2001/XMLSchema-instance");
xsinil.Value = "true";
element.Attributes.Append(xsinil);

answered Dec 24, 2019 at 14:45

M. Fawad Surosh

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