WSDL element is null?

Question

I have an WSDL document and it has elements like this above.

  <s:element name="NewPortalOrder">
    <s:complexType>
      <s:sequence>
        <s:element minOccurs="1" maxOccurs="1" name="OrderType" type="tns:CardSalesType" />
        <s:element minOccurs="1" maxOccurs="1" name="Customer" type="tns:PortalCustomerContainer" />
        <s:element minOccurs="1" maxOccurs="1" name="InvoiceAddress" type="tns:AddressContainer" />
        <s:element minOccurs="1" maxOccurs="1" name="DeliveryAddress" type="tns:AddressContainer" />
        <s:element minOccurs="0" maxOccurs="1" name="Cards" type="tns:ArrayOfPortalCardContainer" />
      </s:sequence>
    </s:complexType>
  </s:element>

I added the WSDL file as a ServiceReference into the solution.

On the server side

  WS.NewPortalOrderRequest order = new WS.NewPortalOrderRequest();

  order.InvoiceAddress.AddressLine1 = txtAddress.Text;
  order.InvoiceAddress.AddressLine2 = txtAddress2.Text;

On the order.InvoiceAddress.AddressLine1 = txtAddress.Text; line I get the Object reference not set to an instance of an object. error.

When I watch the order.InvoiceAddress, I see that is null. Why can I get this error? How can I solve it?

How are you creating `order.InvoiceAdress`? Can you show the complete code? — Tim, Apr 30 '13 at 08:09
Almost all cases of `NullReferenceException` are the same. Please see "[What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net)" for some hints. — John Saunders, Apr 30 '13 at 08:24

score 3 · Accepted Answer · answered Apr 30 '13 at 08:14

Most likely you need to create an instance of InvoiceAddress in the NewPortalOrderRequest, like this:

WS.NewPortalOrderRequest order = new WS.NewPortalOrderRequest();

order.InvoiceAddress = new WS.InvoiceAddress();

// Now you can assign values to InvoiceAddress' property:
order.InvoiceAddress.AddressLine1 = txtAddress.Text;
order.InvoiceAddress.AddressLine2 = txtAddress2.Text;

You might need to do order.InvoiceAddress = new WS.AddressContainer() based on the WSDL, but I'm not 100% sure on that one.

When I do order.InvoiceAddress = new WS.AddressContainer(); it works corretly. Thanks! — Erdinç Özdemir, Apr 30 '13 at 08:29

WSDL element is null?

1 Answers1