我有一个项目,我将复选框的 IsChecked 属性与代码隐藏中的 get/set 绑定。但是,当应用程序加载时,由于某种原因它不会更新。出于好奇,我将其精简到最基本的内容,如下所示:
//using statements
namespace NS
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private bool _test;
public bool Test
{
get { Console.WriteLine("Accessed!"); return _test; }
set { Console.WriteLine("Changed!"); _test = value; }
}
public MainWindow()
{
InitializeComponent();
Test = true;
}
}
}
XAML:
<Window x:Class="TheTestingProject_WPF_.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Grid>
<Viewbox>
<CheckBox IsChecked="{Binding Path=Test, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</Viewbox>
</Grid>
而且,你瞧,当我将其设置为 true 时,它没有更新!
任何人都可以提出解决方案,或者解释原因吗?
谢谢,我们将不胜感激。
为了支持数据绑定,您的数据对象必须实现INotifyPropertyChanged http://wpftutorial.net/INotifyPropertyChanged.html
另外,这总是一个好主意将数据与表示分离 https://stackoverflow.com/questions/14381402/wpf-programming-methodology/14382137#14382137
public class ViewModel: INotifyPropertyChanged
{
private bool _test;
public bool Test
{ get { return _test; }
set
{
_test = value;
NotifyPropertyChanged("Test");
}
}
public PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
<Window x:Class="TheTestingProject_WPF_.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Viewbox>
<CheckBox IsChecked="{Binding Path=Test, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</Viewbox>
</Grid>
背后代码:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new ViewModel{Test = true};
}
}
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