Scenario: You want to get an adapter generated WSDL / XML Schema for a subset of operations.
The following code snippets show how to retrieve a ServiceDescription (WSDL) for a given set of operation identifiers.
Method 1 – Using WCF provided MetadataExchangeClient
Ensure you have the metadata exchange client endpoint defined in the WCF configuration.
<system.serviceModel>
<client>
<endpoint binding="sampleAdapterBinding" contract="IMetadataExchange" name="sample" />
</client>
</system.serviceModel>
Create a sample console application and use MetadataExchangeClient to retrieve metadata.
class Program
{
static void Main(string[] args)
{
// Get the WSDL one operation at a time
string op1 = "{OperationIdentifier1}";
string op2 = "{OperationIdentifier2}";
// Retrieve WSDL using MEX
EndpointAddress mexAddress = new EndpointAddress("sample://localhost:10000/DB2OLEDB/MyDB?wsdl" + "&op=" + op1 + "&op=" + op2);
// Create a metadata exchange client to retrieve metadata as per WS-MEX standard
MetadataExchangeClient mexClient = new MetadataExchangeClient(mexAddress);
// Obtain the metadata
MetadataSet metadataSet = mexClient.GetMetadata(mexAddress);
// Retrieve the first service description found
System.Web.Services.Description.ServiceDescription wsdl =
(System.Web.Services.Description.ServiceDescription) metadataSet.MetadataSections[0].Metadata;
// Write the WSDL to a file
String fileName = @"c:\temp\sample.wsdl";
Console.WriteLine("Writing WSDL to " + fileName);
wsdl.Write(fileName);
}
}
Method 2 – Using Adapter SDK provided MetadataRetrievalClient
WCF LOB Adapter SDK provides a WCF pre-defined proxy class called MetadataRetrievalClient (that implements interface IMetadataRetrievalContract). This class has three key methods –
· public MetadataRetrievalNode[] Browse(string nodeId, int childStartIndex, int maxChildNodes)
· public MetadataRetrievalNode[] Search(string nodeId, string searchCriteria, int maxChildNodes)
· public ServiceDescription GetMetadata(MetadataRetrievalNode[] nodes)
We will use the GetMetadata() method to retrieve the metadata as shown below.
class Program
{
static void Main(string[] args)
{
// create the binding
SampleAdapterBinding binding = new SampleAdapterBinding();
// create the endpoint address
EndpointAddress address = new EndpointAddress("sample://host:100/DB2OLEDB/MyDB?Protocol=TCPIP&Driver=Test");
// create metadata retrieval client
MetadataRetrievalClient metadataProxy = new MetadataRetrievalClient(binding, address);
// Show the nodes on the console
MetadataRetrievalNode op1 = new MetadataRetrievalNode();
op1.NodeId = "{OperationIdentifier1}";
op1.IsOperation = true;
MetadataRetrievalNode op2 = new MetadataRetrievalNode();
op2.NodeId = "{OperationIdentifier2}";
op2.IsOperation = true;
List<MetadataRetrievalNode> nodes = new List<MetadataRetrievalNode>();
nodes.Add(op1);
nodes.Add(op2);
// Get the WSDL
ServiceDescription wsdl = metadataProxy.GetMetadata(nodes.ToArray());
// Write the WSDL to a file
wsdl.Write(@"c:\temp\sampleadapter.wsdl");
// close the client
metadataProxy.Close();
}
}
These methods can come in quite handy while troubleshooting/debugging issues with the adapter metadata generation without using the Add Adapter Service Reference Visual Studio Plug-In/Consume Adapter Service BizTalk Project Add-In.
