C# WPF 数据绑定标签内容
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WPF Data binding Label content
提问by HansElsen
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:
我正在尝试使用数据绑定创建一个简单的 WPF 应用程序。代码看起来不错，但是当我更新我的属性时，我的视图没有更新。这是我的 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>
Here's my code-behind:
这是我的代码隐藏：
namespace Calculator
{
public partial class MainWindow
{
public MainWindow()
{
DataContext = new CalculatorViewModel();
InitializeComponent();
}
}
}
Here's my view-model
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));
}
}
}
I'm can't see what I am missing here?? o.O
我看不到我在这里缺少什么？？oO
采纳答案by HansElsen
CalculatorOutputhas no getter. How should the View get the value? The Property has to be public as well.
CalculatorOutput没有吸气剂。View应该如何获取值？该物业也必须是公开的。
public String CalculatorOutput
{
get { return _calculatorOutput; }
set
{
_calculatorOutput = value;
NotifyPropertyChanged();
}
}
