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If you declare a binding on the Content Presenter, the moment its content is set, the binding would be re-evaluated.For example, let’s say you are building a dual-content control like this: You would expect something like this,image below, right?What isn’t done in the code is passing information to set the value of any properties or custom properties. Like this: But that is a loads like this: With that data context set, you might try this: But this fails. After you change the type of property to a dependency property you can bind to the same property from the XAML of the user control and the XAML of the parent.Please note: the data context property of the user control inherits from the parent. But user controls don’t anticipate a data context type. Writing to one writes to the other and the dependency property itself keeps the coalesced value.Binding inside your user control isn’t exactly obvious either.The reason is, you get an error when you attempt to set the data context of the user control.That may lead to a counterintuitive situation when you want to specify some UI element content and then use bindings in that content.Let's take an example: I realize this is not what most of you have in mind when using a Content Control.

wpf datatemplate binding not updating-64wpf datatemplate binding not updating-4wpf datatemplate binding not updating-39

You will, however, discover that all data binding has stopped working. Rather than explain why this is happening, let me simply share the solution.

Instead, this is meant to be a slightly more practical guide to squeezing performance out of WPF in ways that are probably more likely affecting you.

and its subclasses List Box and List View exacerbate performance problems because these controls are highly dynamic (resolution happens “late”), involve WPF collections (which are slow), and have difficult and unpredictable lifetimes for their child controls.

Binding Expression: Path=Content One Template Selector; Data Item='String' (Hash Code=-694847); target element is 'Content Presenter' (Name=''); target property is 'Content Template Selector' (type 'Data Template Selector') Notice that for some reason the Content One Template, Content One Template Selector, Content Two Template and Content Two Template Selector are bound to an object of type ‘String’. Because the moment you sent the Content Property of the Content Presenter its Data Context was switch to match the value of the Content property.

Since the Content of the both Content Presenters are string, “Hello” and “World” all other bindings on the Content Presenter are now resolved against these string values!

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