.net qr code generator The ObjectStatus Control in Visual Basic .NET

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The ObjectStatus Control
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Editable CSLA .NET business objects that subclass BusinessBase have a set of valuable status properties. These properties are not available for data binding, because they are marked with the <Browsable(False)> attribute and because they don t raise the PropertyChanged event when they change. These properties were discussed in 8 and are listed in Table 8-1. Sometimes, you may need access to these properties within your XAML code. For example, you might want to enable or disable certain controls on the form based on whether the object s IsSavable property returns True or False. The ObjectStatus control from the Csla.Wpf namespace exposes these properties as bindable properties from a WPF control. The ObjectStatus control takes the properties from its current DataContext and exposes them as dependency properties so they can be used in control-to-control data binding. Additionally, the ObjectStatus control includes code to detect when each of the status properties has changed, so it can raise appropriate PropertyChanged events for them. This control is relatively simple. Any time the DataContext changes or the data object raises a changed event such as PropertyChanged, it re-reads the object s status values and updates its own bindable property values for example:
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CHAPTER 10 DATA B INDING
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If IsDeleted <> source.IsDeleted Then IsDeleted = source.IsDeleted End If If IsDirty <> source.IsDirty Then IsDirty = source.IsDirty End If If IsNew <> source.IsNew Then IsNew = source.IsNew End If If IsSavable <> source.IsSavable Then IsSavable = source.IsSavable End If If IsValid <> source.IsValid Then IsValid = source.IsValid End If It updates its own property value only if that value differs from the business object s value. This is because setting the control s property value raises a PropertyChanged event from the control, and that will likely cause some other UI control to refresh based on a trigger or control-to-control data binding. The end result is that you can create a control in the UI to display the status of the object. For example, here s a CheckBox control bound to the IsSavable property: <CheckBox IsEnabled="False" IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=csla:ObjectStatus, AncestorLevel=1}, Path=IsSavable}">IsSavable</CheckBox> The binding expression is quite complex, but the end result is that the control displays the current value of the IsSavable property for the business object referred to by the DataContext. At this point, you should have an understanding of the support provided for WPF data binding within CSLA .NET. The last technology I ll cover is Web Forms, which is the simplest from a data binding perspective.
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Web Forms
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Of the three UI technologies discussed in this chapter, ASP.NET Web Forms has the fewest requirements on business objects. In fact, it imposes no specific requirements on your objects or collections at all. Any object with properties can be bound to controls in a page. Any collection, list, or array that implements IEnumerable (the most basic of all collection interfaces) can be bound to list controls on a page. In short, it just works.
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Controls and Helper Objects
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However, there s one catch, and that is the way the Web Forms data source controls work specifically, the ObjectDataSource control. This control imposes some restrictions on the objects it works with, and those restrictions mean it won t work with CSLA .NET objects.
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C HAPTE R 10 DA TA BINDIN G
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To overcome this limitation, the CslaDataSource control is an ASP.NET data source control that is designed to work with objects containing business logic. This control allows the full use of Web Forms data binding with rich business objects.
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The CslaDataSource Control
Data source controls in ASP.NET have two major areas of functionality: runtime and design time. Runtime functionality is the actual data binding implementation it copies data from the data source to the controls and back again. Design time functionality exists to support Visual Studio 2005 and 2008, allowing developers to graphically create web pages using common controls such as DataGridView and DetailsView when they are bound to the data source control. The detailed design issues around building an ASP.NET data source control are beyond the scope of this book. Nonetheless, I ll walk quickly through the code in these classes to call out the highlights of the implementation. It turns out that implementing runtime functionality is relatively straightforward, but providing design time functionality is more complex. Table 10-7 lists the classes required to implement the CslaDataSource control s runtime and design time support.
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