Simple custom service implementation example

Here is a simple calc custom service implementation for Dynamics 365 for Operations (aka AX7):
Main contract:
[DataContractAttribute("Calc")]
class VKOCalcContract
{
    int                 arg1;
    int                 arg2;
    VKOCalcOperation    operation;
    List                subList;

    [DataMemberAttribute("arg1")]
    public int parmArg1(int _arg1 = arg1)
    {
        arg1 = _arg1;
        return arg1;
    }

    [DataMemberAttribute("arg2")]
    public int parmArg2(int _arg2 = arg2)
    {
        arg2 = _arg2;
        return arg2;
    }

    [DataMemberAttribute("operation")]
    public int parmOperation(int _operation = operation)
    {
        operation = _operation;
        return operation;
    }

    //This parm is just for demonstration on how you can use nested contracts and lists
    [DataMemberAttribute("list"),
        AifCollectionTypeAttribute("_list", Types::Class, classStr(VKOCalcSubContract)),
        AifCollectionTypeAttribute("return", Types::Class, classStr(VKOCalcSubContract))]
    public List parmSubList(List _subList = subList)
    {
        subList = _subList;
        return subList;
    }

    //This parm is just for demonstration on how you can use nested contracts and lists
    [DataMemberAttribute("subCalc")]
    public VKOCalcSubContract parmSubCalc(VKOCalcSubContract _subCalc = subCalc)
    {
        subCalc = _subCalc;
        return subCalc;
    }
}
Sub contract. It is not used by the service, only to show the possibilities:
[DataContractAttribute("SubCalc")]
class VKOCalcSubContract
{
    int a;

    [DataMemberAttribute("a")]
    public int parmA(int _a = a)
    {
        a = _a;
        return a;
    }
}
Response contract:
[DataContractAttribute]
class VKOCalcResponseContract
{
    real result;

    [DataMemberAttribute("result")]
    public real parmResult(real _result = result)
    {
        result = _result;
        return result;
    }
}
Service:
class VKOCalcService
{
    public VKOCalcResponseContract calc(VKOCalcContract _calcContract)
    {
        VKOCalcResponseContract response    = new VKOCalcResponseContract();
        real                    result;
        int                     a1          = _calcContract.parmArg1(),
                                a2          = _calcContract.parmArg2();

        switch (_calcContract.parmOperation())
        {
            case VKOCalcOperation::add:
                result = a1 + a2;
                break;
            case VKOCalcOperation::sub:
                result = a1 - a2;
                break;
            case VKOCalcOperation::multiply:
                result = a1 * a2;
                break;
            case VKOCalcOperation::devide:
                result = a1 / a2;
                break;
        }

        response.parmResult(result);
        
        return response;
    }

}
Additionally you will need to
- create service pointing to the service class with service operation pointing to the calc method of service class.
- create service group holding created service

Example of JSON request:
{
"_calcContract":
    {
         "arg1": 2,
         "arg2": 2,
         "operation": 0,
         "list": [{
             "a": 0,
         },
         {
             "a": 1,
         }],
         "subCalc": {
             "a": 5
         }
    }
}
Example of answer:
{"$id":"1","result":4.0}

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