Apress Expert C sharp 2005 (Phần 12) docx

... component’s interface. An interface is a strong contract the component makes with all callers. That interface contract can’t be changed without all calling code being changed as well. You can ... runat="server" TypeAssemblyName="ProjectTracker.Library" TypeName="ProjectTracker.Library.Admin.Roles" OnDeleteObject="RolesDataSource_DeleteObject" OnInsert...

Ngày tải lên: 06/07/2014, 00:20

... instance, a SelectObject event handler may look like this: protected void CustomerDataSource_SelectObject( object sender, Csla.Web.SelectObjectArgs e) { e.BusinessObject = Customer.NewCustomer(); } Notice ... go-between, CslaDataSourceDesigner maintains references to the CslaDataSource control itself, and to the CslaDesignerDataSourceView object: public class CslaDataSourceDesigner : DataSou...

Ngày tải lên: 06/07/2014, 00:20

... impact on whether users can be authenticated or authorized, but physical tiers can be used to increase or decrease physical access to the machines on which the application executes. For instance, ... data access code into a specific layer, the impact of these changes is limited to a smaller part of the application. Data access mechanisms are typically implemented as a set of services, with ea...

Ngày tải lên: 06/07/2014, 00:20

... to accept the changes to the item, or Esc to undo them. However, even if the user chooses to accept changes to some LineItem objects, they can still choose to cancel the changes on the Invoice ... object that owns the Component. The user might accept changes to a Component, but cancel the changes to its parent LineItem object, thereby forcing an undo operation to reverse accepted changes .....

Ngày tải lên: 06/07/2014, 00:20

... Csla.Core.IUndoableObject. Cascading the Call to Child Objects or Collections If the field is a reference to a Csla.Core.IUndoableObject, the CopyState() call must be cascaded to that object, ... object in the same manner as CopyState(). When the code encounters a child business object that implements Csla.Core.IEditable➥ Object, it cascades the UndoChanges() call to that child object ......

Ngày tải lên: 06/07/2014, 00:20

... the collection contains a specific deleted object. BindingList<T> already includes a Contains() method so that the UI code can ask the collec- tion if it contains a specific item. Since ... collection is where things start to get more complicated. Undoing all the child objects isn’t too hard, since the collection can cascade the request to each child object. A t the collection ... both...

Ngày tải lên: 06/07/2014, 00:20

... the class within which the criteria class is nested. Csla.Server.CallMethodException The MethodCaller class throws a custom Csla.Server.CallMethodException in the case that an exception occurs ... ex) { _innerStackTrace = ex.StackTrace; } Then in the StackTrace property of CallMethodException, the stack trace for the CallMethod➥ Exception itself is combined with the stack trace from the origi...

Ngày tải lên: 06/07/2014, 00:20

... 371 Child Object Creation Child objects are usually created when the UI code calls an Add() method on the collection object that contains the child object. Ideally, the child class and the collection ... for each record. a. The child collection creates a child object by calling a factory method on the child class, passing the data reader as a parameter. b. The child object’s factory method ca...

Ngày tải lên: 06/07/2014, 00:20

... UI consisting of a DataGridView control that displays a collection of Contact objects. If the root object is a collection of child Contact objects, the UI developer can simply bind the collection ... exceptions: • Dual criteria objects • Dual create and fetch factory methods • Dual create and fetch data access methods Let’s discuss each change in turn. Dual Criteria Classes The object’s cri...

Ngày tải lên: 06/07/2014, 00:20

... DataPortal_Execute() { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText ... follows: [Transactional(TransactionalTypes.TransactionScope)] private void DataPortal_Delete(Criteria criteria) { using (SqlConnection cn = new SqlConnection(Database.PTracker...

Ngày tải lên: 06/07/2014, 00:20