C wpf binding not updating
As mentioned previously and as indicated by the arrow in the figure above, the data flow of a binding can go from the binding target to the binding source (for example, the source value changes when a user edits the value of a Text Box) and/or from the binding source to the binding target (for example, your Text Box content gets updated with changes in the binding source) if the binding source provides the proper notifications.
You may want your application to enable users to change the data and propagate it back to the source object.
Before going into the different features of data binding outlined above, we will first discuss in the next section the fundamental concepts that are critical to understanding WPF data binding.
Regardless of what element you are binding and the nature of your data source, each binding always follows the model illustrated by the following figure: As illustrated by the above figure, data binding is essentially the bridge between your binding target and your binding source.
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?
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.
You can control this by setting the Mode property of your Binding object.If the user enters an invalid date (invalid formatting or a past date), the user will be notified with a Tool Tip and a red exclamation point next to the Text Box.The Data Validation section discusses how to create validation logic.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.
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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.