1. Why doesn't work? We'll do that by adding a reference to the namespace the UserControl lives in, in the top of the XAML code of your Window: xmlns:uc="clr-namespace:WpfTutorialSamples.User_Controls". Note that in the case of Xamarin.Forms you need to add a ContentView instead of a User Control. I have a problem with creating a reusable UserControl.I plan two scenarios: Bind from parent ViewModel to specific properties of UserControl (exposed via DependencyProperties). 1. wpf - UserControl的DataContext - Thinbug 在你的情况下你想要. WPF Note that in my case, the ViewModel which the ComboBox needed to get its items from was the DataContext of the page and the DataContext of the ComboBox was the ViewModel which I needed to bind values to. 我是WPF的新手，我有一个问题关注从MainWindow到UserControl的DataContext继承，它将作为Tabpage附加到MainWindow的Tabcontrol . 我们需要2个文件夹，每个文件夹用于View和ViewModel。. wenn wirklich notwendig). xmlns:diagnostics="clr-namespace:System.Diagnostics;assembly=WindowsBase". 2.后台代码分配. In the Sub Window is a UserControl Window. WPF exists as a subset of .NET types that are, mostly located in the System.Windows namespace. In them days of the week I have a custom control called TripUI which is setup in a listview and bound to a ObservableCollection from my viewmodel. The most important of the design-time attiributes is d:DataContext. In this case, you should set the ViewModelExtensions.Parameter attached property in XAML. Also wenn das DataTemplate im selben UserControl ist dann würde ja meiner Meinung nach DataContext={Binding} genügen. Creating & using a UserControl. This custom UserControl will appear as a regular combobox, but unlike the built-in ComboBox object, it can show the user a default string of text if they have not made a selection yet. Get access to the service’s interface from your View Model via the GetService method. DataContext is one of the most fundamental concepts in Data Binding.The Binding object needs to get its data from somewhere, and there are a few ways to specify the source of the data like using Source property directly in the Binding, inheriting a DataContext from the nearest element when traversing up in the tree, setting the ElementName … MainModel 을 만들기 전에 BaseModel을 만들어 주겠습니다. WPF WPF] Using InputBindings with the MVVM pattern WPF UserControl：DataContext Building a XAML UserControl for WinUI, UWP, WPF or Xamarin.Forms (.NET MAUI) July 20, 2021 by Nick. WPF In diesem Artikel beschreibe ich die grundsätzliche Vorgehensweise anhand eines einfachen Eingabe-Controls. Because DataContext inherits, there's potential for each FrameworkElement that uses the inherited value to fire another DataContextChanged event that's sourced from the inheriting element, not the parent element, once the element detects that its inherited DataContext value has changed.