The SOAP request did not return an array with strings as expected, but rather an empty array, when

Encountered a situation where sending a SOAP request with an array of strings through Ajax results in the request being successfully passed to the web service. However, upon deserialization, the array is rendered empty.

The ASP.Net WebService features the given contract:

[WebService(Namespace = "http://someCompany.com/WebServices/TCWS/Agent")]
public class AgentService : WebService  

Highlighted by the following API:

[WebMethod(Description = "my action description", MessageName = "MyAction")]
public Result MyAction(string[] items)  

An AJAX call (using Javascript) is executed as follows:

AgentService.prototype.DoSoapAjax = function (methodName, data, successHandler, errorHandler, state) {
    // Need to use local variable so ajax request will be able to process the guid variable
    var currGuid = window.AgentGUID;

    var response = $.ajax({
        type: "POST",
        contentType: "text/xml; charset=utf-8",
        methodName: methodName,
        url: this.AgentServiceUrl,
        data: data,
...

A demonstration of how DoSoapAjax is called:

AgentService.prototype.MyAction= function (items, successHandler, errorHandler, state) {
    var items = "<items arrayType='string[]'><item xsi:type='string'>first text</items><item xsi:type='string'>second text</items></items>";
    
    ...

Exhibiting the SOAP request:

<?xml version='1.0' encoding='utf-8'?>
    <soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>
        <soap:Body>
            <MyAction xmlns='http://someCompany.com/WebServices/TCWS/Agent'>
                <items xsi:type='string'>first text</items>
                <items xsi:type='string'>second text</items>
            </MyAction>
        </soap:Body>
</soap:Envelope>  

Upon debugging the web service, it becomes apparent that while reaching the MyAction method, the 'items' array appears empty instead of containing 2 strings. Is there an issue present within my SOAP request?

Answer №1

Instead of passing the data object as an array of strings, it is being added to the body as individual string parameters. The correct SOAP format should resemble the following:

<?xml version='1.0' encoding='utf-8'?>
    <soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>
        <soap:Body>
            <MyAction xmlns='http://CosmoCom.com/WebServices/TCWS/Agent'>
                <items arrayType="string[]">
                    <item xsi:type='string'>first text</items>
                    <item xsi:type='string'>second text</items>
                </items>
            </MyAction>
        </soap:Body>
</soap:Envelope>

To convert the data into an array, you can utilize the following method:

var itemArray = jQuery.makeArray(data);

Answer №2

Even though I have come across a solution, the rationale behind its functionality remains unclear as there is no supporting documentation available.
I made modifications to my SOAP request as shown below:

<?xml version='1.0' encoding='utf-8'?>
    <soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>
        <soap:Body>
            <MyAction xmlns='http://someCompany.com/WebServices/TCWS/Agent'>
                <items>
                    <string>first text</string>
                    <string>second text</string>
                </items>
            </MyAction>
        </soap:Body>
</soap:Envelope>  

If anyone could provide an explanation or any accompanying documentation, it would greatly enhance clarity on this matter. It appears that for passing an element, I specify its name, while for an array, I mention its type. This particular solution was discovered in a minor Google document...
Appreciate all the help received.

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