The IRaiseItemChangedEvents Interface: Providing Item Modification Notifications on Collections in VS .NET

Drawer Code 128A in VS .NET The IRaiseItemChangedEvents Interface: Providing Item Modification Notifications on Collections
The IRaiseItemChangedEvents Interface: Providing Item Modification Notifications on Collections
Code 128 Code Set C Maker In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create Code 128 Code Set A image in .NET framework applications.
The IRaiseItemChangedEvents interface lets a collection indicate that it will monitor changes to the properties of the contained objects made through the SetValue method of their property descriptors You would want to do this if you expected your collection type to contain objects that might not implement the INotifyPropertyChanged interface but wanted to provide some opportunity to notify bound controls that the underlying data item properties had changed This interface doesn't make any guarantees about notifying of changes if the properties change through any means other than the SetValue method of their property descriptors This interface is used as a signal to consuming code that your collection will raise ListChanged events when the property values contained in your objects change due to changes made through property descriptorswhich is how all property updates are done through data-bound controls that support editing This interface defines a single member, the RaiseItemChangedEvents Boolean property If your collection returns true from this property, then consuming code can expect to be notified when some object in the collection has changed through a data-bound control The BindingSource component uses this internally to provide better currency of the presented data in bound controls, even if the underlying objects don't support property change notifications themselves To implement support for raising the ListChanged event in response to property value changes on the collection objects, you have to provide a callback delegate to the property descriptor for each property on each object in a collection, so that your collection will be notified when those properties change through the property descriptor You do this through the AddValueChanged method on the PropertyDescriptor class See the BindingListView<T> class implementation in 9 for an example and more discussion of this
Code-128 Reader In Visual Studio .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Making Barcode In .NET Framework
Using Barcode generator for .NET framework Control to generate, create barcode image in .NET applications.
The IEditableObject Interface: Supporting Transactional Item Modifications
Barcode Recognizer In Visual Studio .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications.
The IEditableObject interface lets you defer committing changes to object properties until the editing process is complete Consuming code can then explicitly declare when an edit operation has commenced on an object, and then later choose to commit or reject the changes made to one or more properties on the object before those changes are made visible to other code that may be working with the object Specifically, using this interface defers change notifications to bound controls while an object is being edited until the editing operation is completed through a call to EndEdit You would typically want to implement this interface if your object has co-dependent properties, or if you need to validate multiple property values before declaring an edit to be a legal combination of values If you understood the discussion of the ICancelAddNew interface, then understanding IEditableObject should be easier This interface lets you support the same kind of transactional semantics at the individual data item level for modifying an object in the collection If you have ever edited a row in a data table that is bound to a grid as well as to other controls on a form, you have seen this interface in action If you change a column value in the grid and then tab to another column, that changed value isn't reflected in other bound controls on the form until the focus leaves the row that you are editing (typically by setting the current row to another row) If you press the Esc key before moving the focus off the row, the changes you made are rolled back and the old values are put back into the columns that you edited If you switch the focus to another row, the changes to the row being edited are committed at that point, and the other bound controls on the form will then be updated to reflect the new values This is because the edits to the column (property) values are all treated as part of a single editing transaction against the object, and the edits aren't considered complete from the perspective of other controls until the editing operation is explicitly committed This happens through a call to the object's EndEdit method, either because the grid calls this method when the row is changed or because you explicitly call EndEdit to commit the changes The IEditableObject interface includes three methods: BeginEdit, EndEdit, and CancelEdit None of these take any parameters, and they don't return anything This interface is useful when an object is going to be edited by a data-bound control or other client code; that code can then check to see if the object implements this interface If so, it can call BeginEdit before starting to modify the object, and either callCancelEdit to roll back the changes or EndEdit to commit them The object that implements this interface is expected to maintain a temporary copy of the property values being edited so that it can roll back to the original version if CancelEdit is called 9 shows an example of implementing this interface
Creating Code128 In C#
Using Barcode drawer for .NET Control to generate, create Code 128C image in .NET framework applications.
This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
Generate Code 128 Code Set C In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
Making Code 128B In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create Code128 image in .NET applications.
Make Universal Product Code Version A In .NET Framework
Using Barcode creation for .NET Control to generate, create UPCA image in .NET framework applications.
Creating Bar Code In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Printing Data Matrix 2d Barcode In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create Data Matrix image in VS .NET applications.
Drawing EAN13 In Java
Using Barcode printer for Java Control to generate, create EAN / UCC - 13 image in Java applications.
DataMatrix Generation In Java
Using Barcode maker for Java Control to generate, create DataMatrix image in Java applications.
Code-128 Scanner In VS .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.