WPF数据绑定工作不正常

Question

对不起，如果这很难看，但我不明白。我认为问题在于我的xaml，但我不知道。我想要的是在重量文本框中显示180，在高度文本框中显示5。感谢您的任何建议，并让我知道是否需要更多信息。

这是我MainWindow.xamml.cs

namespace Simple_BMI.Views 
{ 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
      DataContext = new ViewModel(); 
     } 
    } 
} 

这是我MinWindow.xaml

<Window x:Class="Simple_BMI.Views.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="300" Width="300"> 
    <StackPanel Orientation="Vertical"> 
     <StackPanel Orientation="Horizontal" VerticalAlignment="Top"> 
      <Label>Weight: </Label> 
      <TextBox Text="{Binding Model.Weight}" Width="136" /> 
      <Button>Update</Button> 
     </StackPanel> 
     <StackPanel Orientation="Horizontal"> 
      <Label>Height: </Label> 
      <TextBox Text="{Binding Model.Height}" Width="136" /> 
     </StackPanel> 
    </StackPanel> 
</Window> 

我的模型：

namespace Simple_BMI.Models 
{ 
    public class Model : INotifyPropertyChanged 
    { 
     public event PropertyChangedEventHandler PropertyChanged; 

     public Model(double weight, double height) 
     { 
      Weight = weight; 
      Height = height; 
     } 

     private double _Weight; 
     public double Weight 
     { 
      get 
      { 
       return _Weight; 
      } 
      set 
      { 
       _Weight = value; 
       OnPropertyChanged("Weight"); 
      } 
     } 

     private double _Height; 
     public double Height 
     { 
      get 
      { 
       return _Height; 
      } 
      set 
      { 
       _Height = value; 
       OnPropertyChanged("Height"); 
      } 
     } 

     private void OnPropertyChanged(String propertyName) 
     { 
      PropertyChangedEventHandler handler = PropertyChanged;   
      if (handler != null)           
      { 
       handler(this, new PropertyChangedEventArgs(propertyName)); 
      } 
     } 
    } 
} 

我的视图模型：

namespace Simple_BMI.ViewModels 
{ 
    class ViewModel 
    { 
     public ViewModel() 
     { 
      _Measurement = new Model(180, 6); 
     } 

     private Model _Measurement; 
     public Model Measurement 
     { 
      get 
      { 
       return _Measurement; 
      } 
     } 
     public void SaveChanges() 
     { 
      Debug.Assert(false, String.Format("{0} {1} was updated.", Measurement.Weight, Measurement.Height)); 
     } 
    } 
} 

Answer 1

将{Binding Path=Model.替换为{Binding Path=Measurement.。您对ViewModel

也见不同名称的属性：Debugging Data Bindings in a WPF or Silverlight Application

Answer 2

纠正你的XAML文件，使用测量，而不是型号：

<StackPanel Orientation="Vertical"> 
    <StackPanel Orientation="Horizontal" VerticalAlignment="Top"> 
     <Label>Weight:</Label> 
     <TextBox Text="{Binding Measurement.Weight}" Width="136" /> 
     <Button>Update</Button> 
    </StackPanel> 
    <StackPanel Orientation="Horizontal"> 
     <Label>Height:</Label> 
     <TextBox Text="{Binding Measurement.Height}" Width="136" /> 
    </StackPanel> 
</StackPanel>