mvvm

问题 I am using Xamarin Forms PCL (MVVM Prism) with MediaPlugin (https://github.com/jamesmontemagno/MediaPlugin). I have a viewModel with a public property called ImagePath private string imagePath; public string ImagePath { get { return imagePath; } set { SetProperty(ref imagePath, value, "ImagePath"); } } in my XAML i have: <Image Source="{Binding ImagePath}" HeightRequest="100" WidthRequest="100"/> When i set a image url (from web) to ImagePath property, it works without problems. (I am setting

问题 In my program, when I hover over (MouseEnter event) a certain UserControl (here I use TransportOrderLineUserControl) a TransportOrderLineDetailView should be shown. The TransportOrderLineDetailView should be placed at the bottom right of my screen. For this I need to know the ActualWidth & ActualHeight for a correct placement. Because those 2 properties need to have a value different than 0 I execute this code with the DetailView.Loaded event. I use the exact same way for two other objects.

问题 I'm developing a WPF desktop application that I'd also like to run on Mac via Xamarin.Mac. I've taken great care to separate as much core code as possible into a PCL, and keep the WPF-specific code as thin as possible. The UI architecture is MVVM. All of my viewmodels, implementing INotifyPropertyChanged , in are in my core PCL. The WPF UI components can then directly bind to those viewmodel properties. My question is: how can I use my "portable" PCL viewmodels from the Xamarin.Mac side so

问题 Basically, I have a 4 files that I'm dealing with: DBDisplay.xaml DBDisplay.xaml.cs DBDisplayViewModel.cs DBConn.cs In my ViewModel I am trying to populate the following DataGrid from my .xaml file: <DataGrid ItemsSource="{Binding Path=Users}"/> With the following code: public class DBDisplayViewModel { public ICollectionView Users { get; set; } DBConn dbCon; // the connection object DataSet dataSet; DataRow dataRow; private void Load() { string connectionString = Properties.Settings.Default

问题 I am very new using Android architecture components, so I decided to base my application using GithubBrowserSample to achieve many of my use cases. But i have the problem that i don´t know what is the correct way to share viewmodels between fragments with this approach. I want to share the view model because i have a fragment with a viewpager with 2 fragments that need to observe data of the parent fragment view model I used this before to achieve it, based on google's documentation override

问题 I'm starting to study about WFM MVVM pattern. But I can't understand why this Button click works without binding any event or action. View <Window x:Class="WPF2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:WPF2.ViewModel" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <vm:MainWindowViewModel x:Key="MainViewModel" /> </Window.Resources> <Grid x:Name="LayoutRoot"

问题 I'm starting to study about WFM MVVM pattern. But I can't understand why this Button click works without binding any event or action. View <Window x:Class="WPF2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:WPF2.ViewModel" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <vm:MainWindowViewModel x:Key="MainViewModel" /> </Window.Resources> <Grid x:Name="LayoutRoot"

问题 I'm starting to study about WFM MVVM pattern. But I can't understand why this Button click works without binding any event or action. View <Window x:Class="WPF2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:WPF2.ViewModel" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <vm:MainWindowViewModel x:Key="MainViewModel" /> </Window.Resources> <Grid x:Name="LayoutRoot"

问题 I have a button with a context menu associated to it. I can right click on the button and show the context menu as you would expect, however I want to be able to show the context menu after another event, such as a left click, or a drag and drop style event. I am attempting to do this by binding the IsOpen property of the context menu to the view model, but this is not working as expected. On first left click of the button, nothing happens, although I can see the property on the view model

问题 I've a Text box KeyUp Event Trigger Wired up to a command in WPF. I need to pass the actual key that was pressed as a command parameter. The command executes fine, but the code that handles it needs to know the actual key that was pressed (remember this could be an enter key or anything not just a letter, so I can't get it from the TextBox.text). Can't figure out how to do this. XAML: xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" XAML: <TextBox