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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / Read XML through X++ (...
Microsoft Dynamics AX (Archived)

Read XML through X++ (Unable to cast object of type)

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Posted on by AX QA 115

Hi All,

I got this XML format to read into AX and following is the code I wrote to read it but it is failing when code runs in CIL.

XML to read

<?xml version='1.0' encoding='UTF-8' standalone='yes'?>

<ns2:return xmlns:ns2='URL'>

    <status>1 to 1 of 1    </status>

    <ns2:messageresponses>

        <ns2:response>

            <from>

                <email></email>

                <mobile>61417387807</mobile>

                <mri>61417387807</mri>

                <name>61417387807</name>

                <voice></voice>

            </from>

            <responseCategory>notmatched</responseCategory>

            <responseMessage channel='SMS'>

                <acknowledged>21/02/17 10:38</acknowledged>

                <content>Y</content>

            </responseMessage>

        </ns2:response>

    </ns2:messageresponses>

</ns2:return>

X++ Code

// Define XML Document and its nodes
XmlDocument doc;
XmlNodeList xmlScriptList;
XmlNodeList xmlMessageResponseList;
XmlNodeList xmlResponseList;
XmlNodeList xmlContentList;

XmlElement nodeScript;
XmlElement nodeMessageResponses;
XmlElement nodeResponse;
XmlElement nodecontent;

XMLParseError xmlError;

// Define temporary variables
int i, j, k, l;

// Create the XML Document
doc = new XmlDocument();
doc.loadXml(_xmlMsg);

// Verify XML Document Structure
xmlError = doc.parseError();
if(xmlError && xmlError.errorCode() != 0)
{
      throw error(strFmt("XML Error: %1", xmlError.reason()));
}


// Get the root element and its child nodes
nodeScript = doc.getNamedElement("ns2:return");
xmlScriptList = nodeScript.childNodes();

for(i=0; i < xmlScriptList.length(); i++)
{
       nodeMessageResponses = xmlScriptList.item(i);
      xmlMessageResponseList = nodeMessageResponses.childNodes();

for (j=0; j < xmlMessageResponseList.length(); j++)
{
    nodeResponse = xmlMessageResponseList.item(j);
    xmlContentList = nodeResponse.childNodes();

    for (k=0; k < xmlContentList.length(); k++)
    {
       nodecontent = xmlContentList.item(k);

if (nodecontent.selectSingleNode("mobile"))
        mobile = nodecontent.selectSingleNode("mobile").text();

if (nodecontent.selectSingleNode("acknowledged"))
        acknowledgedTime = nodecontent.selectSingleNode("acknowledged").text();

if (nodecontent.selectSingleNode("content"))
       content = nodecontent.selectSingleNode("content").text();

   }

}

        }

The code fails at red highlighted line when executes in CIL with following error message.

System.InvalidCastException: Unable to cast object of type 'Dynamics.Ax.Application.XmlText' to type 'Dynamics.Ax.Application.XmlElement'

 

 

*This post is locked for comments

I have the same question (0)
  • Verified answer
    Martin Dráb Profile Picture
    Martin Dráb 237,959 Most Valuable Professional on at

    As the error says, you try to assign a XmlText object to a XmlElement variable, which isn't a compatible type. Either use a common parent type (such as XmlNode) or - if you need logic specific to XmlElement - check if the object really is a XmlElement (e.g. using the as operator).

  • Ali Zaidi Profile Picture
    Ali Zaidi 4,657 on at

    Why not you write C# code in class library, and then add to aot. It will be more flexible X++.

  • AX QA Profile Picture
    AX QA 115 on at

    Have you got any example of doing this way?

  • Verified answer
    Faisal Fareed Profile Picture
    Faisal Fareed 10,796 User Group Leader on at

    Hi AX QA,

    Change the error line with this code;

    nodeRes = xmlMessageResponseList.item(j);

    where I declare nodeRes; XmlNode     nodeRes;

  • AX QA Profile Picture
    AX QA 115 on at

    Ali, Have you got an example with this approch.

  • Martin Dráb Profile Picture
    Martin Dráb 237,959 Most Valuable Professional on at

    You can use many examples on internet about how to use various approaches in C#. LINQ to XML, for example. Nevertheless you could greatly simplify your code if you used XPath instead of explicitly walking through the tree.

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