Resource items

The following example demonstrates binding a ComboBox to a collection of FontFamily objects. Add new FontFamily "Arial" ; fonts.

Resource items

Resources WPF introduces a very handy concept: The ability to store data as Resource items resource, either locally for a control, locally for the entire window or globally for the entire application.

The data can be pretty much whatever you want, from actual information to a hierarchy of WPF controls. This allows you to place data in one place and then use it from or several other places, which is very useful.

Allow me to demonstrate it with a simple example: Key attribute, which allows you to reference it from other parts of the application by using this key, in combination with the StaticResource markup extension.

Resources - The complete WPF tutorial

In this example, I just store a simple string, which I then use from two different TextBlock controls. DynamicResource In the examples so far, I have used the StaticResource markup extension to reference a resource.

However, an alternative exists, in form of the DynamicResource. The main difference is that a static resource is resolved only once, which is at the point where the XAML is loaded. If the resource is then changed later on, this change will not be reflected where you have used the StaticResource.

Think of it as binding to a static value vs.

Resource items

Dynamic resources also allows you to use resources which are not even there during design time, e. More resource types Sharing a simple string was easy, but you can do much more.

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This should give you a pretty good idea of just how much you can do with resources: The string is used for the label, the array of strings is used as items for the ComboBox control and the gradient brush is used as background for the entire window.

So, as you can see, pretty much anything can be stored as a resource. Local and application wide resources For now, we have stored resources on a window-level, which means that you can access them from all over the window. If you only need a given resource for a specific control, you can make it more local by adding it to this specific control, instead of the window.

It works exactly the same way, the only difference being that you can now only access from inside the scope of the control where you put it: Other controls inside of the StackPanel could have used it as well, just like children of these child controls would have been able to access it. If you need the ability to access the resource from several windows, this is possible as well.

It works exactly the same way as when storing and using from a Window: However, you can of course access your resources from Code-behind as well, which can be useful in several situations. The interface consists of a button and a ListBox.

In Code-behind, we handle the click event of the button, in which we add each of the text strings to the ListBox, as seen on the screenshot.

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We use the FindResource method, which will return the resource as an object if foundand then we turn it into the string that we know it is by using the ToString method. Notice how we use the FindResource method on different scopes - first on the panel, then on the window and then on the current Application object.

It makes sense to look for the resource where we know it is, but as already mentioned, if a resource is not found, the search progresses up the hierarchy, so in principal, we could have used the FindResource method on the panel in all three cases, since it would have continued up to the window and later on up to the application level, if not found.

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