Wpf binding not updating when source changes
OK, so the title is a little ambitious, but there is nothing wrong with setting yourself lofty aims!Because of the depth of this topic I have decided to split this tutorial up into a series of blog posts, each of which explore a different aspect of the binding framework.The other options are Property Changed, Lost Focus and Explicit.The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to Update Source on the Binding. The default is Default, which returns the default Update Source Trigger value of the target dependency property.However, the default value for most dependency properties is Property Changed, while the Text property has a default value of Lost Focus.Data binding is of two types − one-way data binding and two-way data binding.In one-way binding, data is bound from its source (that is the object that holds the data) to its target (that is the object that displays the data) When you press the Show button, it will display the name and age on the message box. If you now click the Show button, it will again display the same message.
Instead, the source was updated only after focus was lost on the Text Box.Databinding is a fundamental part of the WPF, Silverlight and the Silverlight for Windows Phone 7 frameworks.It is a powerful concept that once mastered allows you to write concise and elegant code.Therefore, the default Update Source Trigger value of the Text property is Lost Focus and not Property Changed.If you set the Update Source Trigger value to Explicit, you must call the Update Source method or the changes will not propagate back to the source.