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Consider an application that must, at any given time, have access to a list of all subclasses of a particular class. Metaclasses are a terrific way to go about this, but they have one problem. Remember, each class with a attribute will be processed, including this new base class, which doesn t need to be registered (only its subclasses should be registered). Extra handling is required to make this possible, but doing so is fairly straightforward and will provide great benefits:

} In this case, the exception will never be caught, because it s a SoapException, not a SqlException (even though the root cause of the problem and the original exception object is a SqlException) Even if you catch the SqlException in the web method and manually throw a different exception object, it will still be converted into a SoapException on the client That makes it difficult for the client to distinguish between different types of error conditions The client can catch only a SystemNetWebException (which represents a timeout or a general network problem) or a SystemWebServicesProtocolsSoapException (which represents any NET exception that occurred in the web service) You have one other option You can catch the exception in the web method on the server side and throw the supported SoapException yourself.

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The advantage of this approach is that before your web service throws the SoapException object, you can configure it by inserting additional XML in the <detail> element The client can then read the content and use it to programmatically determine what really happened For example, here s a faulty version of the GetEmployeesCount() method that uses this approach to add the original exception type name to the SoapException using a custom <ExceptionType> element You could extend this approach to add any combination of elements, attributes, and data [WebMethod()] public int GetEmployeesCountError() { SqlConnection con = null; try { con = new SqlConnection(connectionString); // Make a deliberately faulty SQL string string sql = "INVALID_SQL COUNT(*) FROM Employees"; SqlCommand cmd = new SqlCommand(sql, con); conOpen(); return (int)cmdExecuteScalar(); } catch (Exception err) { // Create the detail information // an <ExceptionType> element with the type name..

XmlDocument doc = new XmlDocument(); XmlNode node = doc.CreateNode(XmlNodeType.Element, SoapException.DetailElementName.Name, SoapException.DetailElementName.Namespace); XmlNode child = doc.CreateNode(XmlNodeType.Element, "ExceptionType", SoapException.DetailElementName.Namespace); child.InnerText = err.GetType().ToString(); node.AppendChild(child); // Create the custom SoapException. // Use the message from the original exception, // and add the detail information. SoapException soapErr = new SoapException(err.Message, SoapException.ServerFaultCode, Context.Request.Url.AbsoluteUri, node); // Throw the revised SoapException. throw soapErr; } finally { con.Close(); } } The client application can read the <ExceptionType> element to get the additional information you ve added. Here s an example that displays the exception name in a Windows message box (see Figure 33-6): EmployeesService proxy = new EmployeesService(); try { int count = proxy.GetEmployeesCountError(); } catch (SoapException err) { MessageBox.Show("Original error was: " + err.Detail.InnerText); }

The metaclass performs two functions. First, the block makes sure that the parent class, , has already been defined. If it hasn t been, a is raised, indicating that the metaclass is currently processing itself. Here, more processing could be done for , but the example simply ignores it, allowing it to bypass the registration. In addition, the clause makes sure that another class hasn t specified explicitly as its attribute. The application only wants to register subclasses of , not other classes that might not fit the proper requirements for the application.

SOAP also defines a <Header> section where you can place out-of-band information. This is typically information that doesn t belong in the message payload. For example, a SOAP header might contain user authentication credentials or a session ID. These details might be required for processing the request, but they aren t directly related to the method you re calling. By separating these two portions, you achieve two improvements:

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