Since WPF applications have rich media and graphics support, reusable styles need to be utilized and in a managed way. We can define the styles in WPF XAML files, or perhaps we can manage to accumulate all our useful styles for a particular application in a resource dictionary file.
Adding a resource dictionary is pretty simple. Rename the item as you wish. In a ResouceDictionarywe can keep our custom styles, DataTemplates, ControlTemplates, even custom definitions for BrushColorBackground and a lot of other stuff.
But, wordpress protect media files important thing is that we have to assign a key to each of them since it is a Dictionary. Or perhaps, we can give names to the styles. In this section, we are going to see how we can import a resource file to a XAML file for a user control or a Window or a page. Provided below is a simple code listing for demonstration. Since we can have a resource dictionary for each control, we are going to merge the other resource files to the existing resource dictionary.
There can be cases where we need to access a resource dictionary that we have defined in our project, from C code. If we have already merged our resource dictionary in XAML, it is easy to access the inner resources using the control. Here is a simple code snippet given for better understanding:. We have used a URI to get hold of our resource dictionary content.
Accessing image from Resource File in XAML markup
I must mention one thing here that, while defining the URI, the project name goes first, then the relative path. The UriKind option is very important. Since this is a resource dictionary, we have to access the styles using keys, just like in a normal dictionary. Best of luck, and happy coding!Resources are typically definitions of some object that you expect to use more than once.
To refer to a XAML resource later, you specify a key for a resource that acts like its name. You can reference a resource throughout an app or from any XAML page within it.
Then, you can reference your resources by using a StaticResource markup extension or ThemeResource markup extension. Here, we explain how to define a ResourceDictionary and keyed resources, and how XAML resources relate to other resources that you define as part of your app or app package.XAML WPF - Styles Part 3, Resource Dictionaries
We also explain resource dictionary advanced features such as MergedDictionaries and ThemeDictionaries. XAML resources are objects that are referenced from markup more than once. Resources are defined in a ResourceDictionarytypically in a separate file or at the top of the markup page, like this.
Resources don't have to be strings; they can be any shareable object, such as styles, templates, brushes, and colors. However, controls, shapes, and other FrameworkElement s are not shareable, so they can't be declared as reusable resources.
For more info about sharing, see the XAML resources must be shareable section later in this topic. All resources need to have a key. However, there are a few other ways to specify a key:. The StaticResource markup extension can retrieve resources only with a string name x:Key or x:Name. Here, the Style has an implicit key of typeof Buttonand since the Button at the bottom of the page doesn't specify a Style property, it looks for a style with key of typeof Button :.
For more info about implicit styles and how they work, see Styling controls and Control templates. When you perform a resource lookup in code, only the resources in the Page. Resources dictionary are looked at. Unlike the StaticResource markup extensionthe code doesn't fall back to the Application.
To look up app-wide resources from code, use Application. Resources to get the app's resource dictionary, as shown here. You can avoid both problems if you add the resource in the Application. OnLaunched method, like this.Out of the various build actions defined by WPF only following two are important for binary resources :.
Site of origin at the runtime gets resolved in different ways depending upon the way in which the application has been deployed. While accessing the resource from procedural code in WPF, triple comma syntax is used however above table for URIs remains still applicable except the last two rows with site of origin.
I have mentioned in my other post the book which I refer to for my WPF learning. So after reading it, I try to put my understanding in my words. It may or may not have the same kind of example from the book. Thanks for pointing out the matter and next time will try to be careful about it.
Merry Christmas! However, what is the differences under the hood fileformat or compiler behavior? Both embed a binary resource inside an assembly, but the latter should be avoided in WPF projects. This also means that resources embedded with the Content or Resource build action can be referenced easily from XAML, but resources embedded with the EmbeddedResource build action cannot be unless you write some custom code.
Hope above explaination helps. The difference is how easily how you can access the resource information. Dylan: As i know. Suppose you want some image to show in the window whenever the application runs. Either you place it in the project itself or embed it or you can give an appropriate path.
But in both cases, the image can be thought of as a resource. I hope i have explained.! I seriously am grateful for all the hard effort that you have done keeping this place available for everyone. I truly hope this sticks around for a good long while. My programmer is trying to convince me to move to. I have always disliked the idea because of the costs. I have heard good things about blogengine.This article has a corresponding video that can be viewed here.
Resource Dictionaries are a powerful feature in WPF and Silverlight that enable developers to organize and consume reusable resources. After completing this walk through you'll understand how to create and merge resource dictionaries in WPF and Silverlight; how to add, consume and modify resources in the dictionary using the tools provided by the WPF and Silverlight Designer in Visual Studio Before diving into resource dictionaries let's first understand what the term "resource" means when used in the context of a resource dictionary or in a resources section of an object in XAML.
A resource is an object declared in XAML. In the below XAML we see examples of typical resources; my: is an alias for the System namespace in mscorlib. One reason to use resources in your applications is to promote object reuse across your application.
Object reuse provides consistency across the application. Object reuse also makes it very easy to change the application; since you only need to change the resources and all consumers will pick up the change.
When you add resources to the Resources property, you are actually adding them to a ResourceDictionary exposed by the object. The Resources property is defined on FrameworkElement and is inherited from any object that has FrameworkElement in its inheritance hierarchy.
We will now use the "Extract Value to Resource…" feature of the Designer.
ResourceDictionary and XAML resource references
To exact a property value to a resource, click on the Property Marker, this will open the below Context Menu. Now select, "Extract Value to Resource…". When the Create Resource dialog opens, change the Key to "formBackground," leave the Destination value to whatever it defaulted to and click OK. Notice that I have chosen to name the resource by its role, as opposed to what it looks like. Adopting this Key naming convention allows a resource to be changed without causing a conflict with the Key name.
For example, if the Key name was BlueGradient and I assigned it to each forms Background property, then later wanted to change it to a green gradient, the name would still be BlueGradient but the color was now green. By naming the Key formBackground, I've not associated any color or type of brush with the name. To help us quickly locate the TextBlock properties that have been set, we will now use a very cool feature of the Designer's Properties Window, "Sort by property source.
Using the Properties Window, click the "Sort by property source" Button top red arrow. Notice the yellow highlighted line of XAML. This alias was added by the Designer tool. When the Designer tool adds an alias, it names the first one, "my" the next alias, "my1", etc. For very small forms with a single alias this may be acceptable. However for most projects you'll want to use meaningful names for your aliases.
Accessing resource strings via code in UWP
You have several options open to you to change these. First, if you define the alias in the XAML file before extracting to a resource, the Designer tool will reuse the alias when referencing the same namespace and assembly.If you have in your WPF project an ResourceDictionary that you use to define resources you can create an instance of it from code like this:.
Another less known way of doing same thing is defining the code-behind for the resource dictionary. I have not found an automated way of doing this in VS. NET so I do it manually. Then you add class to your project that holds code-behind and you name it RedRibbonBar. Then you create simply new instance of your dictionary like so:. Thanks for dropping by! Feel free to join the discussion by leaving comments, and stay updated by subscribing to the RSS feed.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a custom collection defined in my window resources as follows in a Sketchflow app so the window is actually a UserControl :. I want to be able to refer to this collection in the codebehind, which I expected would be by the x:Name, but I can't seem to access it.
You should use System. Also, a good practice is to create a string constant which maps the name of your key in the resource dictionary so that you can change it at only one place. You may also use this. I guess that is not much better than your own suggestion.
Learn more. Asked 10 years, 2 months ago. Active 4 months ago. Viewed 96k times. FindName "myKey" ; but this seems hackish. Is this bad practice, and what would be better? Thanks :. Dave Clemmer 3, 11 11 gold badges 46 46 silver badges 72 72 bronze badges. Active Oldest Votes. Alexander Abakumov 8, 6 6 gold badges 57 57 silver badges 93 93 bronze badges. You can use: Application. It depends on the context.
Can you elaborate on "Also, a good practice is to create a string constant which maps the name of your key in the resource dictionary so that you can change it at only one place. Jakob Christensen Jakob Christensen This is for Windows 8 Store Apps. This will not work if the resource is in another file, for instance a theme color.
FindResource is the way to go. Not exactly direct answer, but strongly related: In case the resources are in a different file - for example ResourceDictionary. Nicke Manarin 1, 1 1 gold badge 21 21 silver badges 46 46 bronze badges.WPF introduces a very handy concept: The ability to store data as a 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. The concept is used a lot for styles and templates, which we'll discuss later on in this tutorial, but as it will be illustrated in this chapter, you can use it for many other things as well. Allow me to demonstrate it with a simple example:.
Resources are given a key, using the x: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. In this example, I just store a simple string, which I then use from two different TextBlock controls.
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.
A DynamicResource on the other hand, is resolved once it's actually needed, and then again if the resource changes.
Think of it as binding to a static value vs. Dynamic resources also allows you to use resources which are not even there during design time, e.
Sharing a simple string was easy, but you can do much more. In the next example, I'll also store a complete array of strings, along with a gradient brush to be used for the background. This should give you a pretty good idea of just how much you can do with resources:.
This time, we've added a couple of extra resources, so that our Window now contains a simple string, an array of strings and a LinearGradientBrush. 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. 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:.
In this case, we add the resource to the StackPanel and then use it from its child control, the Label. 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. Controls outside of this particular StackPanel wouldn't have access to it, though.
If you need the ability to access the resource from several windows, this is possible as well.
Using a Resource Dictionary in WPF
The App. It works exactly the same way as when storing and using from a Window:. Using it is also the same - WPF will automatically go up the scope, from the local control to the window and then to App.
So far, we've accessed all of our resources directly from XAML, using a markup extension. However, you can of course access your resources from Code-behind as well, which can be useful in several situations.