的属性我有IntegerUpDown的实现:依赖属性不绑定到视图模型
<UserControl x:Class="Scoreboard.View.IntegerUpDown"
...
xmlns:local="clr-namespace:Scoreboard.View"
d:DesignHeight="28" Width="86"
DataContext="{Binding RelativeSource={RelativeSource Self}}">
<Grid>
<StackPanel Orientation="Horizontal">
<TextBox x:Name="TxtNum" x:FieldModifier="private" Margin="0,5,0,5" Width="50"
Text="{Binding NumValue,Converter={local:NumberToStringConverter}, Mode=TwoWay}" PreviewTextInput="TxtNum_PreviewTextInput"/>
<!-- Nothing interesting below -->
<Button Margin="0,5" x:Name="CmdUp" x:FieldModifier="private" Width="18" Click="cmdUp_Click" >
<Path Data="M 0,300 L 0,300 200,0 400,300" Stretch="Fill" Width="8.333" Height="5.833" Stroke="Black"/>
</Button>
<Button Margin="0,5" x:Name="CmdDown" x:FieldModifier="private" Width="18" Click="cmdDown_Click" >
<Path Data="M 0,-300 L 0,-300 -200,0 -400,-300" Stretch="Fill" Width="8.333" Height="5.833" Stroke="Black"/>
</Button>
</StackPanel>
</Grid>
和后面的代码:
public partial class IntegerUpDown
{
public int MaxValue { get; set; } = int.MaxValue;
public int NumValue
{
get { return (int)GetValue(NumValueProperty); }
set { SetValue(NumValueProperty, value); }
}
public static readonly DependencyProperty NumValueProperty =
DependencyProperty.Register("NumValue",
typeof(int), typeof(IntegerUpDown), new PropertyMetadata(0));
public IntegerUpDown()
{
InitializeComponent();
}
//Nothing interesting below
private void cmdUp_Click(object sender, RoutedEventArgs e)
{
if (NumValue < MaxValue)
{
NumValue++;
}
}
private void cmdDown_Click(object sender, RoutedEventArgs e)
{
if (NumValue > 0)
{
NumValue--;
}
}
}
IntegerUpDown工作正常的独立的。 TextBox中的文本与DP NumValue相同。问题是当这个控件被另一个控件使用时,我想将NumValue与一个不同的属性绑定。像这样
<UserControl x:Class="Scoreboard.View.TeamGameControl"
...
d:DataContext="{d:DesignInstance ViewModel:ControlPanel}">
<local:IntegerUpDown ... NumValue="{Binding Val, Mode=TwoWay}"/>
<!-- doesn't do anything ↑ ... why? -->
怎么看起来财产的Val的DataContext:
public class ControlPanel : INotifyPropertyChanged {
public int Val
{
get { return _val; }
set
{
_val = value;
RaisePropertyChangedEvent("Val");
}
}
}
两个属性(VAL,NumValue)都不是不断更新的。我究竟做错了什么?
编辑: 我已经剪掉了必要的零件,这里是project。
的文本,如果(int.TryParse(TxtNum.Text,出临时)!) - 删除不等于也是在绑定值更改为瓦尔像NumValue =“{结合Val,Mode = TwoWay}“ –
我在写这个问题时犯了一个错误。现在它被编辑了。不相等并不能解决我的问题。 – Korhak
你改变了你的约束力吗? –