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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. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. Note Axapta will generally survive the latency values indicated with the exception of the one indicated for We query the values we inserted so far to get one row we inserted. The result shows the column email_addresses as a single entity representing all the e-mail addresses nested within: benchmark@ORA10G> select * from dep_email_addresses; DEP_NO EMAIL_ADDRESSES ------ ---------------------------------------------------------------10 VARRAY_OF_VARCHARS('king@mycompany.com', 'joe@mycompany.com', 'john@mycompany.com') To unnest the individual e-mail address values tucked away in the varray column into separate rows, we can use the table clause along with the keyword column_value in our query as follows. Essentially, we have to do a join of the table dep_email_addresses with our varray column cast as a table using the table clause. As you can see, what would be a simple select joining a parent/child table looks more complicated when we use objects to store data in tables: benchmark@ORA10G> select c.dep_no, a.column_value 2 from dep_email_addresses c, table(c.email_addresses) a; DEP_NO -----10 10 10 COLUMN_VALUE -------------------------------------------------king@mycompany.com joe@mycompany.com john@mycompany.com When building an object-oriented business logic layer, everything should be represented by an object in the object model Thus, operations like the preceding examples should be naturally reflected within the object model in the Business Logic layer To determine whether a customer s data is in the database, the UI developer should write code like the following: if (CustomerExists(id)) The implementation of the Exists() method obviously needs to execute some server-side code to check whether that customer ID value exists in the database Similarly, the UI code to ship an order should look like this: OrderShip(id); The implementation of the Ship() method needs to execute extensive server-side code to perform the shipping process So the question, then, is how to implement the Exists() and Ship() methods by using objects in the business object model. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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