[英]How to bind SelectionChanged Event to Visibility Property on other Element in XAML Only
[英]WPF: How to bind a Visibility property to an xaml element?
我遇到一些問題,需要幫助。 我想將視圖模型的可見性屬性綁定到xaml元素,以便僅通過更改視圖模型中的值就可以進行一些視覺更改(在這種情況下為折疊或顯示)。
我得到了這個xaml
<Window x:Class="PampelMuse.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:welcome="clr-namespace:PampelMuse.Views.Welcome"
xmlns:backend="clr-namespace:PampelMuse.Views.Backend"
xmlns:pampelMuse="clr-namespace:PampelMuse" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
Title="PampelMuse" Height="670" Width="864">
<Grid>
<Image HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Source="Resources/Images/Backgrounds/4.jpg" Stretch="UniformToFill" />
<welcome:WelcomeScreen x:Name="UIWelcome" HorizontalAlignment="Center" VerticalAlignment="Center" Visibility="{Binding ElementName=UiWelcomeVisibility}" />
<backend:BackendUI x:Name="UIBackend" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Visibility="{Binding ElementName=UiBackendVisibility}" />
</Grid>
如您所見,可見性綁定到UIModel中的屬性UiWelcomeVisibility和UiBackendVisibility。 這些屬性現在定義如下:
public partial class MainWindow : Window
{
private ViewModel.ViewModel ViewModel = PampelMuse.ViewModel.ViewModel.GetInstance();
public MainWindow()
{
InitializeComponent();
DataContext = ViewModel; // Setting the data context what effects all the xaml elements in this component too, including UIWelcome and BackendUI
ViewModel.UIModel.UiBackendVisibility = Visibility.Collapsed;
}
ViewModel:
public class ViewModel
{
private static ViewModel instance = new ViewModel();
public UIModel UIModel = UIModel.GetInstance();
public static ViewModel GetInstance()
{
return instance;
}
}
和UIModel:
public class UIModel
{
private static UIModel instance = new UIModel();
public Visibility UiWelcomeVisibility { get; set; }
public Visibility UiBackendVisibility { get; set; }
public static UIModel GetInstance()
{
return instance;
}
}
我只是在這里看不到任何編碼錯誤(而且實際上在運行時也沒有得到),但是UIModel的UiBackendVisibility並未更改BackendUI-visibility-property。
有任何想法嗎? 到目前為止謝謝。
您在執行綁定錯誤。 Visibility="{Binding ElementName=UiWelcomeVisibility}"
設置元素的可見性等於另一個名為“ UiWelcomeVisibility”的可視元素 。 這有兩個問題:
Visibility
屬性的有效值。 您想要的是改為將數據綁定到視圖模型。 假設您已經將DataContext
設置為viewmodel,只需使用
<welcome:WelcomeScreen ... Visibility="{Binding UiWelcomeVisibility}" />
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