xaml

问题 I've got an ItemsControl which displays objects from a list from my viewmodel. I also have code to display a Popup when the user click on an item in the ItemsControl. However I don't know how to get the actual object from the clicked item to read its properties and display them in the Popup . I've got a Click event handler for the Button (which is used to display my items in the ItemsControl ) and I tried to see in the debugger if the button contains the desired object but apparently it doesn

问题 Can someone explain me why need to use implementation of INotifyPropertyChanged when using binding in wpf? I can bind properties without implementation of this interface? For example i have code public class StudentData : INotifyPropertyChanged { #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

问题 Can someone explain me why need to use implementation of INotifyPropertyChanged when using binding in wpf? I can bind properties without implementation of this interface? For example i have code public class StudentData : INotifyPropertyChanged { #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

问题 Can someone explain me why need to use implementation of INotifyPropertyChanged when using binding in wpf? I can bind properties without implementation of this interface? For example i have code public class StudentData : INotifyPropertyChanged { #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

问题 Can someone explain me why need to use implementation of INotifyPropertyChanged when using binding in wpf? I can bind properties without implementation of this interface? For example i have code public class StudentData : INotifyPropertyChanged { #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

问题 I'm trying to create an AppBarButton where the icon property is a FontIcon but the specific icon I want to use is not working; it is showing as a rectangle. I'm creating a UWP app in C# and I'm trying to create a button with the QR Code (Unicode point ED14) icon from the Segoe MDL2 Assets font but when I enter the icon identifier into the Glyph property of the FontIcon element it simply shows the placeholder rectangle as if the font is not installed. Every other icon I have used in my app

问题 Hopefully this isn't a stupid question but I've spent several hours looking for this answer with no results. Basically, I want to be able to control the appearance of hovered and pressed buttons. I've included the code for one of my buttons below. Here are my issues I have other buttons in my UI that I want to be able to assign this same style to I'd rather not copy/paste all this code because if I ever need to change the colors later, I'm screwed The <style> tag doesn't work because it can't

问题 I've a ComboBox Bound To a CollectionViewSource and I want that by default the selected index should be -1 (Because nothing should be selected) I've set SelectedIndex="-1" and the first item is still selected. Why? My View xaml: <Window.Resources> <CollectionViewSource x:Key="States" Source="{Binding States}"/> <CollectionViewSource x:Key="Cities" Source="{Binding Source={StaticResource States}, Path=Cities}"/> </Window.Resources> <ComboBox SelectedValue="{Binding Person.State}" Width="150"

问题 I am currently running into some trouble with binding objects to a WPF ListBox. The number of Elements is populated correctly but the Name property cannot be accessed. I get the following error message: System.Windows.Data Error: 40 : BindingExpression path error: 'Name' property not found on 'object' ''__ComObject' (HashCode=17252513)'. BindingExpression:Path=Name; DataItem='__ComObject' (HashCode=17252513); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

问题 I have a ContentPage where I've created a bindable property, so that I can pass some info from the ViewModel to the class that implements the ContentPage. To make it clearer, the code behind class has new bindable property (ConnectionSettingsEnabled) defined: public partial class ConnectionSettingsPage : ContentPage { public static readonly BindableProperty ConnectionSettingsEnabledProperty = BindableProperty.Create(nameof(ConnectionSettingsEnabled), typeof(bool), typeof