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Comb binding is sometimes referred to as plastic comb binding or spiral comb binding. confining noun cover; something which fastens synonyms for binding Compare Synonyms conclusive irrevocable mandatory required essential imperative requisite bounden compulsory counted upon incumbent on indissoluble obligatory unalterable antonyms for binding MOST The Master-detail scenario section provides information about this type of binding. To enable each collection view to sort and filter independently, initialize each collection view with its own DataView object. The binding engine checks if there are any custom ValidationRule objects defined whose ValidationStep is set to UpdatedValue for that Binding, in which case it calls the Validate method on each ValidationRule that has ValidationStep set to UpdatedValue until one of them runs into an error or until all of them pass. To restate some of the concepts discussed in the previous sections, you establish a binding using the Binding object, and each binding usually has four components: a binding target, a target property, a binding source, and a path to the source value to use. The data source. When constructing a Binding instance with Binding constructor, you must specify three items: The name of the control property to bind to. The first line binds to the collection. Regardless of what element you're binding and the nature of your data source, each binding always follows the model illustrated by the following figure. Webthe act of fastening, securing, uniting, or the like. The ElementName property is useful when you're binding to other elements in your app, such as when you're using a slider to adjust the width of a button. In addition, you may also use a ToolTip to display the error message. Views also support the notion of a current item. (Printing, Lithography & Bookbinding) the covering within which the pages of a book are bound 3. A DataErrorValidationRule object checks for errors that are raised by objects that implement the IDataErrorInfo interface. A binding target. Bindings can be configured to resolve with a specific object, as opposed to using the data context for binding resolution. Only types derived from DependencyObject can define dependency properties. Elements can be bound to data from different kinds of data sources in the form of .NET objects and XML. The binding engine checks if there are any custom ValidationRule objects defined whose ValidationStep is set to CommittedValue for that Binding, in which case it calls the Validate method on each ValidationRule that has ValidationStep set to CommittedValue until one of them runs into an error or until all of them pass. If a validation error or other type of error occurs at any time during this process, the process is halted: The binding engine checks if there are any custom ValidationRule objects defined whose ValidationStep is set to RawProposedValue for that Binding, in which case it calls the Validate method on each ValidationRule until one of them runs into an error or until all of them pass. This section discusses how to set up a binding. (Perhaps the selected item was at the beginning of the list before, but now the selected item might be somewhere in the middle.) Although not shown in the figure, it should be noted that the binding source object isn't restricted to being a custom .NET object. Consider the following example, where myDataObject is an instance of the MyData class, myBinding is the source Binding object, and MyData is a defined class that contains a string property named ColorName. A binding contains all the information that can be shared across several binding expressions. If we apply this example to our basic diagram, the resulting figure looks like the following. The Button then inherits the DataContext value from the DockPanel, which is its parent element. If the source collection implements the INotifyCollectionChanged interface, the changes raised by the CollectionChanged event are propagated to the views. The current item pointer can be affected by any sorting or filtering that is applied to the collection. Thus, this example generates a button with a red background. See IValueConverter for more information. If the data context changes or the object in the data context changes, the change is not reflected in the target property. To provide some examples, your binding source may be a UIElement, any list object, an ADO.NET or Web Services object, or an XmlNode that contains your XML data. A collection view also maintains a pointer to the current item in the collection. Other than setting the DataContext property on an element directly, inheriting the DataContext value from an ancestor (such as the button in the first example), and explicitly specifying the binding source by setting the Binding.Source property on the binding (such as the button the last example), you can also use the Binding.ElementName property or the Binding.RelativeSource property to specify the binding source. A typical use of data binding is to place server or local configuration data into forms or other UI controls. The rest of this article discusses many of the concepts associated with and some of the properties and usage of the Binding object. In WPF, dependency properties of elements can be bound to .NET objects (including ADO.NET objects or objects associated with Web Services and Web properties) and XML data. To solve that problem, the app defines DataTemplates. Notice that in the previous example, the binding source is specified by setting the DockPanel.DataContext property. Without specific instructions of how to display the data collection, the ListBox displays the string representation of each object in the underlying collection, and the ContentControl displays the string representation of the object it's bound to. To create another view for the same collection, you can create another CollectionViewSource instance and give it a different x:Key name. When binding to a view, the slash ("/") character in a Path value designates the current item of the view. However, sometimes it may be more appropriate to specify the binding source on individual binding declarations. Instant changes are fine for CheckBox and other simple controls. As it exists in the underlying collection, your data may or may not have a relevant, inherent order. It's difficult to notice from the image but the items are also sorted by the start date within each category. The slash and property syntax can also be stacked to traverse a hierarchy of collections. However, what if instead of having a property of type string your binding source object has a Color property of type Color? The
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