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The Csla.Server.SimpleDataPortal object (discussed later in the chapter) will ultimately invoke methods on business objects based on the MethodInfo object returned from GetMethod(). To support this, MethodCaller implements two different CallMethod() overloads: public static object CallMethod( object obj, string method, params object[] parameters) { MethodInfo info = GetMethod(obj.GetType(), method, parameters); if (info == null) throw new NotImplementedException( method + " " + Resources.MethodNotImplemented); return CallMethod(obj, info, parameters); }
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public static object CallMethod( object obj, MethodInfo info, params object[] parameters) { // call a private method on the object object result; try { result = info.Invoke(obj, parameters); } catch (Exception e) { throw new Csla.Server.CallMethodException( info.Name + " " + Resources.MethodCallFailed, e.InnerException); } return result; } The first version accepts the method name as a string value, while the second accepts a MethodInfo object. In the first case, GetMethod() is called to retrieve a matching MethodInfo object. If one isn t found, an exception is thrown; otherwise, the second version of CallMethod() is invoked. The second version of CallMethod() actually invokes the method by using the MethodInfo object. The interesting bit here is the way exceptions are handled. Since reflection is being used to invoke the business method, any exceptions that occur in the business code end up being wrapped within a reflection exception. To business developers, the exception from reflection isn t very useful. They want the actual exception that occurred within their business method. To resolve this, when an exception is thrown as the business method is invoked, it is caught, and the InnerException of the reflection exception is wrapped within a new Csla.Server.CallMethodException. Effectively, the reflection exception is stripped off and discarded, leaving only the original exception thrown within the business code. That exception is then wrapped within a CSLA .NET exception so the name of the failed business method can be returned as well.
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The CallMethodIfImplemented() method is similar to the CallMethod() methods mentioned previously, but it doesn t throw an exception if the method doesn t exist on the business class. public static object CallMethodIfImplemented( object obj, string method, params object[] parameters) { MethodInfo info = GetMethod(obj.GetType(), method, parameters); if (info != null) return CallMethod(obj, info, parameters); else return null; } This is the same basic code as the first CallMethod() implementation, except that it doesn t throw an exception if the method isn t found. Instead, it simply returns a null value. CallMethodIfImplemented() is used by Csla.Server.SimpleDataPortal to invoke optional methods on the business class methods that should be invoked if implemented by the business developer, but which shouldn t cause failure if they aren t implemented at all. An example is DataPortal_OnData PortalInvoke(), which is purely optional, but should be called if it has been implemented by the business developer.
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The final method in MethodCaller is used by both Csla.DataPortal and Csla.Server.DataPortal to determine the type of business object involved in the data portal request. It uses the criteria object supplied by the factory method in the business class to find the type of the business object itself. This method supports the two options discussed earlier: where the criteria class is nested within the business class and where the criteria object inherits from Csla.CriteriaBase: public static Type GetObjectType(object criteria) { if (criteria.GetType().IsSubclassOf(typeof(CriteriaBase))) { // get the type of the actual business object // from CriteriaBase return ((CriteriaBase)criteria).ObjectType; } else { // get the type of the actual business object // based on the nested class scheme in the book return criteria.GetType().DeclaringType; } } If the criteria object is a subclass of Csla.CriteriaBase, then the code simply casts the object to type CriteriaBase and retrieves the business object type by calling the ObjectType property. With a nested criteria class, the code gets the type of the criteria object and then returns the DeclaringType value from the Type object. The DeclaringType property returns the type of the class within which the criteria class is nested.
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