how we can set value for xml element using XmlDocument class

Question

Is it possible to set value dynamically for any XML element using the XmlDocument class? Suppose my XML is

    <?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
    <env:Header xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
    <soapenv:Body>
        <v9:ProcessShipmentReply xmlns:v9="http://fedex.com/ws/ship/v9">
            <v9:HighestSeverity xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SUCCESS</v9:HighestSeverity>
            <v9:Notifications xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
                <v9:Severity>SUCCESS</v9:Severity>
                <v9:Source>ship</v9:Source>
                <v9:Code>0000</v9:Code>
                <v9:Message>Success</v9:Message>
                <v9:LocalizedMessage>Success</v9:LocalizedMessage>
            </v9:Notifications>
            <v9:CompletedShipmentDetail>
                <v9:CompletedPackageDetails xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
                    <v9:SequenceNumber>1</v9:SequenceNumber>
                    <v9:TrackingIds>
                        <v9:TrackingIdType>GROUND</v9:TrackingIdType>
                        <v9:TrackingNumber>634649515000016</v9:TrackingNumber>
                    </v9:TrackingIds>
                    <v9:Barcodes>
                        <v9:BinaryBarcodes>
                            <v9:Type>COMMON_2D</v9:Type>
                            <v9:Value>Wyk+HjAxHTAyMDI3ODAdODQwHTEzNx02MzQ2NDk1</v9:Value>
                        </v9:BinaryBarcodes>
                        <v9:StringBarcodes>
                            <v9:Type>GROUND</v9:Type>
                            <v9:Value>9612137634649515000016</v9:Value>
                        </v9:StringBarcodes>
                    </v9:Barcodes>
                    <v9:Label>
                        <v9:Type>OUTBOUND_LABEL</v9:Type>
                        <v9:ShippingDocumentDisposition>RETURNED</v9:ShippingDocumentDisposition>
                        <v9:Resolution>200</v9:Resolution>
                        <v9:CopiesToPrint>1</v9:CopiesToPrint>
                        <v9:Parts>
                            <v9:DocumentPartSequenceNumber>1</v9:DocumentPartSequenceNumber>
                            <v9:Image>iVBORw0KGgoAAAANSUhEUgAAAyAAAASwAQAAAAAryhMIAAAagEl</v9:Image>
                        </v9:Parts>
                    </v9:Label>
                </v9:CompletedPackageDetails>
            </v9:CompletedShipmentDetail>
        </v9:ProcessShipmentReply>
    </soapenv:Body>

How could I set value for the below element like

<v9:Severity>SUCCESS</v9:Severity>
<v9:Source>ship</v9:Source>

I know how to extract data from XML and I think it is also possible to set value for the XML element using XMLDocument class. Looking for guidance.

Answer 1

If you know how to select a value, then you probably know how to update one too.

XmlDocument doc = new XmlDocument();
doc.Load(...);
XmlNamespaceManager nsMgr = new XmlNamespaceManager(doc.NameTable);
nsMgr.AddNamespace("v9", "http://fedex.com/ws/ship/v9");

XmlNode severityNode = doc.SelectSingleNode("//v9:Severity", nsMgr);
severityNode.innerText = "FAILURE";

The important thing to know is that the <v9:Severity> node has an inner text() node, so in the example above you can't use the Node.Value property. To do that you would do something like this instead:

XmlNode severityTextNode = doc.SelectSingleNode("//v9:Severity/text()", nsMgr);
severityTextNode.Value = "FAILURE";

Note the subtle differences.