xaml

问题 Here is the xaml that I am working on: <TextBlock Text="{Binding Title}" Margin="10,0,0,0" VerticalAlignment="Center"> <TextBlock.Resources> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <Trigger Property="Text" Value=""> <Setter Property="Margin" Value="0" /> </Trigger> </Style.Triggers> </Style> </TextBlock.Resources> </TextBlock> When text = "" I want to clear up the margin. But somehow it does not work. 回答1: You must move Margin="10,0,0,0" from TextBlock to setter of Style :

问题 Here is the xaml that I am working on: <TextBlock Text="{Binding Title}" Margin="10,0,0,0" VerticalAlignment="Center"> <TextBlock.Resources> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <Trigger Property="Text" Value=""> <Setter Property="Margin" Value="0" /> </Trigger> </Style.Triggers> </Style> </TextBlock.Resources> </TextBlock> When text = "" I want to clear up the margin. But somehow it does not work. 回答1: You must move Margin="10,0,0,0" from TextBlock to setter of Style :

问题 Here is the xaml that I am working on: <TextBlock Text="{Binding Title}" Margin="10,0,0,0" VerticalAlignment="Center"> <TextBlock.Resources> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <Trigger Property="Text" Value=""> <Setter Property="Margin" Value="0" /> </Trigger> </Style.Triggers> </Style> </TextBlock.Resources> </TextBlock> When text = "" I want to clear up the margin. But somehow it does not work. 回答1: You must move Margin="10,0,0,0" from TextBlock to setter of Style :

问题 I'm playing with the COOL xamarin shell, but I didn't found a way to change icon of the selected tab. <TabBar Route="sections"> <Tab Title="home"> <Tab.Icon> <FontImageSource FontFamily="{StaticResource AppIcons}" Glyph="{x:Static framework:Icons.HomePage}" /> </Tab.Icon> <ShellContent ContentTemplate="{DataTemplate home:HomePage}" Route="home" /> </Tab> The goal is to use Icons.HomePageFilled instead of Icons.HomePage for this tab only when it's selected. Same logic should apply to other

问题 In WPF you can create a DataTemplate, put it in a ResourceDictionary, assign it a Type and then bind data of that type to a ContentControl and the DataTemplate will be used to render. as in this example: How do I use the DataType property on a WPF DataTemplate? the Xamarin.Forms enterprise apps ebook hints at such an ability but does not show any example: https://developer.xamarin.com/guides/xamarin-forms/enterprise-application-patterns/mvvm/#Creating_a_View_Defined_as_a_Data_Template Can

问题 I am converting a VB.NET Winforms project to C# WPF. I have a project with two WPF windows and a ViewModel as a referenced project. public class SheepViewModel : INotifyPropertyChanged { private string _CurrentEventName; public string CurrentEventName { get { return _CurrentEventName; } set { _CurrentEventName = value; OnPropertyChanged("CurrentEventName"); } } static SheepViewModel _details; public static SheepViewModel GetDetails() { if (_details == null) _details = new SheepViewModel();

问题 I want to use embedded images in my portable code. I am using a markup extension as many different videos and guides have shown. My project compiles and runs but no image is displayed. These guides say to put the images under "references" but I am unable to drag an image there or right click and add one in so they are in a folder called Images. If the problem is that they aren't under references then how do I get them there? Otherwise if anyone can spot the error that would be much

问题 I have a Canvas control with various elements on, in this particular function I am allowing a user to drag the end point of a line around the canvas. In the MouseMove function I call e.GetPosition() . The function is, according to the VS performance analyzer, close to 30% of total CPU for the app when constantly moving around. Its pretty slow. What can I do to increase this performance? CurrentPoint = e.GetPosition(PointsCanvas); 回答1: I've faced the same problem while using MouseMove on

问题 Developing a project on Android with Xamarin.Forms.I am trying to create a page with six image buttons to navigate the user through the app. Vertically half page, 3 on right side 3 on the left side. No scroll no other things. When I use absolute layout, only images in the bottom of the screen is working. Other imagebuttons didn't work. If I put only 2 images they work. They were in a grid. I deleted grid to try and nothing is changed. <AbsoluteLayout BackgroundColor="Black" AbsoluteLayout

问题 This (simplified) c# / XAML UWP Webview app displays a blank page after the app is resumed after about 90+ sec. when displaying a local security cam video stream webpage. It appears to timeout after about 90 sec while the app is being suspended and then upon resuming the webview page is blank. To give the sample code below something to display, I randomly picked a site from a web search and landed on http://www.porttampawebcam.com/. The few youtube and webcam pages I've tried didn't reproduce