When your app grows, you may introduce new Color keys and then copying this Key in all Theme files, with theme specific Color value. Make sure that the number of Colors and their Key Names remain same in all theme files. Once you define keys and values for one theme, simply copy paste them into other theme files and just change the values of Colors respective to that Theme file. It’s up to you, how you define the names of Color Keys. This file contains only Colors defined for different layouts and controls of your app. Once added, change its content to following: To add these files, add new ContentPage(LightTheme.xaml). While providing reference in Code, we need to use the C# object of these files. Providing the reference of these files as FilePath in Source property, is only allowed in XAML. Create separate ResourceDictionary files for each Theme as displayed in this snapshot. Actually you can define as many themes as you want. Let’s define two themes in one app, Light Theme and Dark Theme. Style Binding: You can bind this Style to a Control on the page as follows: Steps to implement themes: Step 1: Define Theme Colors as ResourceDictionary: Each style should have a unique key and target control/class type. You may define these styles in App.xaml file of your app. If your app has a same look and feel for Textbox in all pages, you may not want to copy paste the UI definition of Textboxes on every pages, instead, you will define one style for that control and bind that style to that control in all pages. Styles: Styles are defined for the UI controls of your app to give it consistent look and feel throughout the app.

Typically, you will find ResourceDictionary in App.xaml file. You can add multiple resources into one ResourceDictionary by using MergedDictionaries. ResourceDictionary: Resources are grouped together and stored in a ResourceDictionary. Thus, when we change the Theme, we don’t have to change all the values but the defined set of Resources only. Resources: Resources are the common shared values across the app, which can highly scales the reusability of values, by reducing the hardcoded values in the app. We can achieve this by the use of Resources, ResourceDictionaries and Styles in Xamarin.Forms.

Theme is an ability to change the Color scheme of the app among some predefined set of Color schemes like Light, Dark, or any other set of Colors. You may find this approach in many popular apps like YouTube, Skype etc which provides their users to select from Light or Dark app modes. Themes add some flavors to your app, attracting more customers/users to your app.

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