Implementation of IWsdlExportExtension.ExportContract

Question

The DataMember attribute by default makes the member nillable. Since the EmitDefault is not available in beta2, I am trying to figure out how I can do this by intercepting the ExportContract method of IWsdlExportExtension in IContractBehavior implementation. But it is not clear where and how I can modify the generated WSDL. I was able to get my implementation invoked when navigating to WSDL for the contract. However I am not sure about how to modify the supplied arguments to ExportContract.

I would appreciate if some can post an example code on how the wsdl is modified in this method.

Thanks.

Answer 1

It turned out that I needed to intercept IWsdlExportExtension.ExportEndPoint method to modify the generated XSD schema for my data contract definition. This is working now.

However when I was inspecting the operation related schema, the input argument (i.e. of user defined data contract type) is also marked with nillable = true. For example, if you have following service contract:

    [ServiceContract()]
    public interface MyContract2
    {
        [OperationContract()]
        Customer GetCustomer(CustomerSearch searchInfo);
    }

    [DataContract]
    public class CustomerSearch
    {
    ...
    }

    [DataContract]
    public class Customer
    {
    ...
    }

The generated xsd is:

<?xml version="1.0" encoding="utf-16" ?>

- <xs:schema xmlns:tns="http://tempuri.org/" elementFormDefault="qualified" targetNamespace="http://tempuri.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:import namespace="http://schemas.datacontract.org/2004/07/WCF.Service" />

- <xs:element name="GetCustomer">

- <xs:complexType>

- <xs:sequence>

  <xs:element minOccurs="0" name="searchInfo" nillable="true" xmlns:q1="http://schemas.datacontract.org/2004/07/WCF.Service" type="q1:CustomerSearch" />

  </xs:sequence>

  </xs:complexType>

  </xs:element>

- <xs:element name="GetCustomerResponse">

- <xs:complexType>

- <xs:sequence>

  <xs:element minOccurs="0" name="GetCustomerResult" nillable="true" xmlns:q2="http://schemas.datacontract.org/2004/07/WCF.Service" type="q2:Customer" />

  </xs:sequence>

  </xs:complexType>

  </xs:element>

  </xs:schema>

If I set the nillable attribute to false in the ExportEndPoint method, I still have minOccurs = 0 on the user defined data contract type (note that it is not data member but an arugment to the operation). Since minOccurs =0, one can still call this GetCustomer method with null value for CustomerSearch object. I should be able to control the minOccurs attribute declaratively (as with proposed EmitDefault attribute on data member).  What I  am trying to say is, there should be a way to specify (declaratively) the required input argument to be non-null value by making the minOccurs = 1 and nillable = false for a given argument on the operation contract.

Thanks

Answer 2

Hi,

I am trying to change my generated xsd schema and i am experiencing some problems. Can you send me your sample code to [e-mail] please?

Thanks in advance

Answer 3

While you are at it, pls also feel free to send it over to christian.weyer AT_NOSPAM thinktecture.com

Cheers,

Answer 4

Hi Raghu,

I am also trying to do something similar to this. But i dont how to access XSD contents from ExportEndPoint method. I could access whole WSDL contents and schema includes. However, from schema includes i couldnt  access the actual schemas. I need to modify the generated XSDs .

 Could you please share you complete code here or send it to me saravana at extremeexperts  dot com

 

Thanks, Saravana.

 

Answer 5

I found how to do it. i will post my code soon here.

Thanks

Saravana

Answer 6

Here is a post in which is explained a possible solution to make Xsd annotations with WCF

http://www.agilior.pt/blogs/bruno.camara/archive/2006/10/01/6.aspx

BFC

 

 

Answer 7

Hi Saravana

Can you tell me how to do minOccurs=1 and Nilable=false

Can you post the sample code.

Thanks,

Suresh M

 

Answer 8

Hi,

I'm also looking for a way to edit the generated schemas... Could you please post your code?

Thanks Lior