WPF数据绑定标签内容
问题描述:
我正在尝试使用数据绑定创建一个简单的WPF应用程序。
代码似乎很好,但是当我更新我的属性时,我的观点没有更新。
这是我的XAML:
I'm trying to create a simple WPF Application using data binding. The code seems fine, but my view is not updating when I'm updating my property. Here's my XAML:
<Window x:Class="Calculator.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:calculator="clr-namespace:Calculator"
Title="MainWindow" Height="350" Width="525"
Name="MainWindowName">
<Grid>
<Label Name="MyLabel" Background="LightGray" FontSize="17pt" HorizontalContentAlignment="Right" Margin="10,10,10,0" VerticalAlignment="Top" Height="40"
Content="{Binding Path=CalculatorOutput, UpdateSourceTrigger=PropertyChanged}"/>
</Grid>
</Window>
这是我的代码隐藏:
namespace Calculator
{
public partial class MainWindow
{
public MainWindow()
{
DataContext = new CalculatorViewModel();
InitializeComponent();
}
}
}
这是我的视图模型
namespace Calculator
{
public class CalculatorViewModel : INotifyPropertyChanged
{
private String _calculatorOutput;
private String CalculatorOutput
{
set
{
_calculatorOutput = value;
NotifyPropertyChanged();
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
var handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
我不能看到我在这里失踪? o.O
I'm can't see what I am missing here?? o.O
答
CalculatorOutput
没有吸气剂。 View应该如何获得价值?该属性也必须是公开的。
CalculatorOutput
has no getter. How should the View get the value? The Property has to be public as well.
public String CalculatorOutput
{
get { return _calculatorOutput; }
set
{
_calculatorOutput = value;
NotifyPropertyChanged();
}
}