Wpf binding not updating


24-Feb-2018 07:36

The following figure illustrates the different types of data flow: Note that to detect source changes (applicable to One Way and Two Way bindings), the source must implement a suitable property change notification mechanism such as INotify Property Changed.See Implement Property Change Notification for an example of an INotify Property Changed implementation.Data binding can also mean that if an outer representation of the data in an element changes, then the underlying data can be automatically updated to reflect the change.For example, if the user edits the value in a Text Box element, the underlying data value is automatically updated to reflect that change.The data binding functionality in WPF has several advantages over traditional models, including a broad range of properties that inherently support data binding, flexible UI representation of data, and clean separation of business logic from UI.This topic first discusses concepts fundamental to WPF data binding and then goes into the usage of the Binding class and other features of data binding.

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You may want your application to enable users to change the data and propagate it back to the source object.As described in the last section, the direction of the data flow is determined by the value of the Mode property of the binding.However, does your source value get updated while you are editing the text or after you finish editing the text and point your mouse away from the Text Box?A typical use of data binding is to place server or local configuration data into forms or other UI controls.

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In WPF, this concept is expanded to include the binding of a broad range of properties to a variety of data sources.The Mode property page provides more information about binding modes and an example of how to specify the direction of a binding.Bindings that are Two Way or One Way To Source listen for changes in the target property and propagate them back to the source. For example, you may edit the text of a Text Box to change the underlying source value.Content Controls such as Button and Items Controls such as List Box and List View have built-in functionality to enable flexible styling of single data items or collections of data items.