Question

I’ve consumed a web service with two classes “address” and “request.” One of the properties of the request object is an array of address objects:

request _req = new request();
_req.addresses = // expecting address[]

I know I’m doing this wrong (as I keep getting exception errors) so I’m hoping someone can help me out. How do I create an array of address objects and set the “_req.addresses” value equal to that object (address[])? I get an “object reference not set to an instance…” error on the second line, when trying to set the city value equal to the string _q.LocationA.City… so these aren’t working:

    address[] _address = new address[1];
    _address[0].city = _q.LocationA.City;
    _address[0].state = _q.LocationA.State;
    _address[0].street = _q.LocationA.Address;
    _address[0].zipCode = _q.LocationA.Zip;

    request _req = new request();
    _req.addresses = _address;

And I’ve tried this:

    address _address = new address();
    _address.city = _q.LocationA.City;
    _address.state = _q.LocationA.State;
    _address.street = _q.LocationA.Address;
    _address.zipCode = _q.LocationA.Zip;

    request _req = new request();
    _req.addresses[0] = _address;

Answer 1

Your classes need to be instantiated separately from your array. C# won’t call your constructor automatically, so that’s why you get a NullPointerException in the first set of code. The second code fails because you’re giving it a single object, instead of an array.

You essentially need to combine the two:

address[] _address = new address[1];
_address[0] = new address();
_address[0].city = _q.LocationA.City;
_address[0].state = _q.LocationA.State;
_address[0].street = _q.LocationA.Address;
_address[0].zipCode = _q.LocationA.Zip;

request _req = new request();
_req.addresses = _address;