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What happens behind the scenes

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When Business Data Catalog clients, such as Business Data Web Parts and custom solutions, use the Business Data Catalog to execute back-end Web methods, the Business Data Catalog does the following:

  • Queries the Web service URL (the WsdlFetchUrl property on the LobSystem element) for discovery information.

  • Extracts a WSDL-based Web service description.

  • Dynamically generates the code for a Microsoft Visual C# proxy in memory.

  • Compiles the Visual C# proxy code to an in-memory assembly.

  • Assigns a namespace with the user-specified name (the ProxyNamespace property on the LobSystem element) to the proxy class and method parameter types, and saves the namespace to the Shared Services database for future use.

  • When requested, creates the required SOAP requests, plugs in any filter values, and sends the request to the Web server.