how to edit XML data within SOAP Request using C#?

Question

I would like to edit xml data for one element with in SOAP request in order to send unique SOAP requests.

Following is the example request

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"xmlns:web="http://webservice/">
   <soapenv:Header/>
   <soapenv:Body>
      <web:ca>
         <type1>
            <ad>2013-07-19</ad>
            <name>abcd 13071502</name>
            <taker>
               <taker>TEST</taker>
               <emailAddress>[email protected]</emailAddress>
               <name>nameTest</name>
               <phoneNo>007007007</phoneNo>
               <takerUid>1234</takerUid>
            </taker>
         </type1>
         <type2>4</type2>
         <type3>peace</type3>
         <type4>test</type4>
      </web:ca>
   </soapenv:Body>
</soapenv:Envelope>

I would like to change "name" element value from "abcd 13071502" to "abcd ". I was able to extract data from "name" element and edit the value by using following code in C#

System.Xml.XmlTextReader xr = new XmlTextReader(@filePath);
while (xr.Read())
{
if (xr.LocalName == "name")
    {
        xr.Read();
        currentNameValue = xr.Value;
        int cnvLen = currentNameValue.Length;
        string cnvWOdate = currentNameValue.Substring(0, cnvLen-8);
        string newNameValue = cnvWOdate+currTimeDate;
        break;
    }
}

However, I couldn't figure out how to edit the value and save the file. Any help would be appreciated. Thank you.

FYI, new XmlTextReader() has been deprecated since .NET 2.0. Use XmlReader.Create() instead. — John Saunders
– John Saunders, Commented Jul 23, 2013 at 14:18

nicholas · Accepted Answer · 2013-07-23 14:56:03Z

1

Use the XmlDocument class instead of the XmlTextReader class.

System.Xml.XmlDocument xd = new XmlDocument();
xd.Load(@"filepath");

foreach(XmlNode nameNode in xd.GetElementsByTagName("name"))
{
    if(nameNode.ParentNode.Name == "type1")
    {
        string currentNameValue = nameNode.InnerText;
        int cnvLen = currentNameValue.Length;
        string cnvWOdate = currentNameValue.Substring(0,cnvLen-8);
        string newNameValue = cnvWOdate+currTimeDate;

        nameNode.InnerText = newNameValue;
    }
}

xd.Save(@"newFilePath");

edited Jul 23, 2013 at 14:56

answered Jul 23, 2013 at 14:15

nicholas

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8 Comments

maddy Over a year ago

Thanks for Quick response. But for some reason (as I struggled earlier), this code is not recognizing "name" element. I have received "Object reference not set to an instance of an object" error message.

nicholas Over a year ago

Sounds like a NullReferenceException. Which line is this happening on?

maddy Over a year ago

I believe this is happening right after currentNameValue = nameNode.InnerText;

maddy Over a year ago

HI Nicholas, Just to remind you there are two tags with same name as "name", is this causing problem ?

nicholas Over a year ago

I have made a few corrections and have tested this code. Apart from not having the string currTimeDate defined in my version, it runs fine and performs as expected.

|

sora0419 · Accepted Answer · 2013-07-23 17:14:38Z

0

XmlDocument doc = new XmlDocument();
doc.Load("file path");

XmlNode nameNode = doc.SelectSingleNode("/Envelope/Body/ca/type1/name");

string currentNameValue = nameNode != null ? nameNode.InnerText : "name not exist";
int cnvLen = currentNameValue.Length;
string cnvWOdate = currentNameValue.Substring(0, cnvLen-8);
string newNameValue = cnvWOdate+currTimeDate;

nameNode.InnerText = newNameValue; //set new value to tag

To get Value or InnerText of a node, you will have to make sure the node exist. The line string currentNameValue has the format like this:

var variable = condition ? A : B;

It's basically saying that if condition is true, then variable equals A, otherwise, variable equals B.

answered Jul 23, 2013 at 17:14

sora0419

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3 Comments

nicholas Over a year ago

Performing the null check is a good approach if you are calling SelectSingleNode. However, I disagree with your use of a default value "name not exist" because the rest of the code will continue to execute and will produce odd results. It is probably better to wrap the InnerText modification in an if block. My answer avoids this since the foreach loop will only iterate when the node is not null anyway.

sora0419 Over a year ago

@nicholas right, the foreach loop will only iterate the ones that are not null. However, he said that he is still getting null reference, so I suspect that the null reference is from somewhere else, that why I suggest checking the specific ones. And with the default value, "name not exist" is just a suggestion, he can even assign as empty string and check later. But yes, I agree there are multiple ways to attack this problem.

maddy Over a year ago

@sora0419 - Thanks for your answer, I have found why I am getting null reference as I given as I have given wrong format in filepath. For my problem, I can vote your answer as acceptable too; unfortunately, this forum gives me option to choose only one.

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