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CHAPTER 10 DATA B INDING
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If a property is not updatable, Authorizer will check to see if the UI control has an IsReadOnly property; if it does, it will set the value to true. Otherwise, it will set the IsEnabled property to false, because all controls have that property. The SetWrite() method handles this. private void SetWrite(Binding bnd, UIElement ctl, IAuthorizeReadWrite source) { bool canWrite = source.CanWriteProperty(bnd.Path.Path); // enable/disable writing of the value PropertyInfo propertyInfo = ctl.GetType().GetProperty("IsReadOnly", BindingFlags.FlattenHierarchy | BindingFlags.Instance | BindingFlags.Public); if (propertyInfo != null) { propertyInfo.SetValue( ctl, !canWrite, new object[] { }); } else { ctl.IsEnabled = canWrite; } } There is no standard interface you can use to find the IsReadOnly property, so reflection is used. If the property exists, it will be set; otherwise, the code will fall back to disabling the UI control entirely. The Authorizer control can save a lot of UI code when building a form for editing details, because it manages the status of all data bound detail controls with little or no code required in the UI itself. You can see how this is used in 19.
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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: if (IsDeleted != source.IsDeleted) IsDeleted = source.IsDeleted; if (IsDirty != source.IsDirty) IsDirty = source.IsDirty;
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C HAPTE R 10 DA TA BINDIN G
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if (IsNew != source.IsNew) IsNew = source.IsNew; if (IsSavable != source.IsSavable) IsSavable = source.IsSavable; if (IsValid != source.IsValid) IsValid = source.IsValid; It only updates its own property value 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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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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