![]() The localized content is loaded from the app extension package, not the host app.Ĭan be used from your host app to describe the extension to the user. It is queryable from, and can use, the new resource management system ( ms-resource:TokenName) for localization. You could also use the Properties element, discussed below, for that.Ĭan be used from your host app to identify the extension to the user. For example, you could have one Extension designed for desktop and another for mobile, with the ID being the differentiator. App extension hosts can use the ID to infer something about the type of extension. Because there can be multiple extensions that use the same extension contract name (imagine a paint app that supports several extensions), you can use the ID to tell them apart. When it matches the Name declared in a host, that host will be able to find this extension. The meaning of the attributes are as follows: Attribute These are necessary because we are using the uap3 namespace. Package.appxmanifest in the MathExtension project: Īgain, notice the xmlns:uap3=" line, and the presence of uap3 in IgnorableNamespaces. Open the Package.appxmanifest file in the MathExtension project to see how this is done. ![]() Declare an app to be an extensionĪn app identifies itself as an app extension by declaring the element in its Package.appxmanifest file. You can define multiple hosts and multiple extensions in the same app. By convention, we recommend building the extension contract name using your app or publisher name to avoid potential collisions with other extension contract names. When an extension specifies the same extension contract name, the host will be able to find it. The Name element in is the extension contract name. identifies this app as an extension host. Notice the xmlns:uap3=" and the presence of uap3 in IgnorableNamespaces. Package.appxmanifest in the MathExtensionHost project See the Package.appxmanifest file in the MathExtensionHost project to see how this is done. In Microsoft Visual Studio 2019, load MathExtensionSample.sln from the code sample.Īn app identifies itself as an app extension host by declaring the element in its Package.appxmanifest file. Let's see how this is done by examining the Math Extension code sample which implements a hypothetical calculator that you can add new functions to by using extensions. Use the API in the host app to access the extensions.Define how the hosts and its extensions will communicate.Decide whether to implement the extension as an app service, background task, or some other way.Declare an app to be an extension host.Extensions can add value and longevity to your app.Īt a high level, to set up an app extension relationship, we need to: These create richer experiences for those apps that go beyond the functionality they shipped with. Consider Microsoft Office extensions, Visual Studio extensions, browser extensions, etc. When you create an app extension host, you create an opportunity to develop an ecosystem around your app in which other developers can enhance your app in ways that you may not have expected or had the resources for. An extension app can provide multiple extensions.īecause app extensions are just UWP apps or packaged desktop apps, they can also be fully functional apps, host extensions, and provide extensions to other apps-all without creating separate app packages. App extensions were introduced in the Windows 10 Anniversary edition (version 1607, build 3).Īpp extensions are UWP apps or packaged desktop apps that have an extension declaration that allows them to share content and deployment events with a host app. In Windows 10, app extensions provide functionality similar to what plug-ins, add-ins, and add-ons do on other platforms. Deploy the solution: Build > Deploy Solution.Set the build type to x86 ( Build > Configuration Manager, then change Platform to x86 for both projects). In Visual Studio 2019, open MathExtensionSample.sln.Download and unzip the Math Extension code sample.Follow these instructions to get started with the sample: This sample is a UWP app, but the features demonstrated in the sample are also applicable to packaged desktop apps. To demonstrate how to create an app extension, this article uses package manifest XML and code snippets from the Math Extension code sample. App extensions are supported in UWP apps and packaged desktop apps. This article shows you how to create a Windows 10 app extension and host it in an app.
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