MVVM light Bindungspfad funktioniert nicht

Question

Ich versuche eine Variable zu binden, die im Inhalt eines Labels angezeigt wird. Ich verwende Galasoft's MVVM light, um dies zu erreichen. Ich sende meine viewmodel, meine window und meine window.cs. Das Problem ist, dass nichts passiert, wenn ich die Werte erhöhe, aber etwas sollte.

Fenster: ich verbindlich sind nur ein Etikett

<Window x:Class="DPCKOU_prog3hf_pong.Settings" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:local="clr-namespace:DPCKOU_prog3hf_pong" 
    mc:Ignorable="d" 
    Title="Settings" Height="406" Width="717" 
    Background="{StaticResource MainMenuBG}" 
    ResizeMode="NoResize" 
    WindowStartupLocation="CenterScreen" 
    > 
<Grid> 
    <StackPanel> 
     <Label x:Name="Title" HorizontalContentAlignment="Center" HorizontalAlignment="Stretch" 
       Foreground="#00e4ff" FontSize ="28" Content="Size of pad" 
       Margin="10,30,10,10"> 
      <Label.BitmapEffect> 
       <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
      </Label.BitmapEffect> 
     </Label> 
     <Label x:Name="Size" HorizontalContentAlignment="Center" HorizontalAlignment="Stretch" 
       Foreground="#00e4ff" FontSize ="40" Content="{Binding Path=PadSize}" 
       Margin="10,0,10,10"> 
      <Label.BitmapEffect> 
       <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
      </Label.BitmapEffect> 
     </Label> 
     <DockPanel> 
      <Button x:Name="Increase" Content="Increase" HorizontalAlignment="Left" 
      Width="149" Height="46" Foreground="#00e4ff" Background="Black" Margin="120,10,10,10" 
      FontSize="18" BorderThickness="0" Click="Increase_Click"> 
       <Button.BitmapEffect> 
        <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
       </Button.BitmapEffect> 
      </Button> 
      <Button x:Name="Decrease" Content="Decrease" HorizontalAlignment="Right" 
      Width="149" Height="46" Foreground="#00e4ff" Background="Black" Margin="10,10,120,10" 
      FontSize="18" BorderThickness="0" Click="Decrease_Click"> 
       <Button.BitmapEffect> 
        <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
       </Button.BitmapEffect> 
      </Button> 
     </DockPanel> 
     <Button x:Name="Play" Content="Play" HorizontalAlignment="Center" 
      Width="149" Height="46" Foreground="#00e4ff" Background="Black" Margin="10,10,10,10" 
      FontSize="18" BorderThickness="0" Click="Play_Click"> 
      <Button.BitmapEffect> 
       <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
      </Button.BitmapEffect> 
     </Button> 
     <Button x:Name="Back" Content="Back" HorizontalAlignment="Center" 
      Width="149" Height="46" Foreground="#00e4ff" Background="Black" Margin="10,10,10,10" 
      FontSize="18" BorderThickness="0" Click="Back_Click"> 
      <Button.BitmapEffect> 
       <DropShadowBitmapEffect Color="#00e4ff" ShadowDepth="0" Opacity="1"/> 
      </Button.BitmapEffect> 
     </Button> 
    </StackPanel> 
</Grid> 

Das Modell des cs:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using GalaSoft.MvvmLight; 

namespace DPCKOU_prog3hf_pong 
{ 
    class SettingsVM : ViewModelBase 
    { 
     int padSize; 
     public int PadSize 
     { 
      get 
      { 
       return padSize; 
      } 
      set 
      { 
       if(value >=1 && value <= 6) 
       { 
        Set(ref padSize, value); 
       } 
      } 
     } 
     public SettingsVM() 
     { 
      padSize = 1; 

     } 
    } 
} 

und die window.cs:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
using System.Windows.Shapes; 
using GalaSoft.MvvmLight; 

namespace DPCKOU_prog3hf_pong 
{ 
    /// <summary> 
    /// Interaction logic for SingleSettings.xaml 
    /// </summary> 
    ///   
    /* 
    * take it 100 pixels is the 4 units of the pad's size respectively. 
    * so 25 shall be 1 and that is the default value one can input. 
    * the player can input pad size from 1 to 6 meaning from 25 pixels  to 150. 
*/ 

public partial class Settings : Window 
{ 
    /* 
    * its sole purpose is to change the pad size. 
    */ 
    SettingsVM svm; 
    bool isPlaymodeSingle; 
    public Settings(bool isPlaymodeSingle) 
    { 
     InitializeComponent(); 
     this.isPlaymodeSingle = isPlaymodeSingle; 
     svm = new SettingsVM(); 
    } 

    private void Play_Click(object sender, RoutedEventArgs e) 
    { 
     if (isPlaymodeSingle) 
     { 
      //yes, solo 
      SinglePlayer spgame = new SinglePlayer(); 
      spgame.Show(); 
      Close(); 
      /* 
      * show the game window and close this. 
      */ 
     } 
     else 
     { 
      //nope, multi. 

     } 
    } 

    private void Decrease_Click(object sender, RoutedEventArgs e) 
    { 
     svm.PadSize--; 
    } 

    private void Increase_Click(object sender, RoutedEventArgs e) 
    { 
     svm.PadSize++; 
    } 

    private void Back_Click(object sender, RoutedEventArgs e) 
    { 
     MainWindow mw = new MainWindow(); 
     mw.Show(); 
     Close(); 
    } 


} 
} 

Answer 1

Sie haben vergessen, DataContext des Fensters zu setzen.

können Sie tun das, zum Beispiel in den Konstruktor der Klasse Einstellungen:

public Settings(bool isPlaymodeSingle) 
{ 
    InitializeComponent(); 
    this.isPlaymodeSingle = isPlaymodeSingle; 
    svm = new SettingsVM(); 

    DataContext = svm; // here 
}