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我正在致力於UserControl
,其中我有MaximumAngle
和MinimumAngle
屬性。必須不同的兩個UserControl依賴項屬性
// MinimumAngle
public double MinimumAngle
{
get { return (double)GetValue(MinimumAngleProperty); }
set { SetValue(MinimumAngleProperty, value); }
}
public static readonly DependencyProperty MinimumAngleProperty = DependencyProperty.Register(
"MinimumAngle", typeof(double), typeof(RoundGauge), new PropertyMetadata((double)0, MinimumAnglePropertyChanged));
private static void MinimumAnglePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RoundGauge rg = (RoundGauge)d;
rg.CreateTickLines();
}
// MaximumAngle
public double MaximumAngle
{
get { return (double)GetValue(MaximumAngleProperty); }
set { SetValue(MaximumAngleProperty, value); }
}
public static readonly DependencyProperty MaximumAngleProperty = DependencyProperty.Register(
"MaximumAngle", typeof(double), typeof(RoundGauge), new PropertyMetadata((double)180, MaximumAnglePropertyChanged));
private static void MaximumAnglePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RoundGauge rg = (RoundGauge)d;
rg.CreateTickLines();
}
這些屬性必須是不同的,因爲我的CreateTickLines
方法要瘋了,當它具有處理爲零。
我可以用這個做什麼?
使用屬性元數據註冊[CoerceValueCallback](https://msdn.microsoft.com/en-us/library/system.windows.coercevaluecallback(v = vs.110).aspx)。 – Clemens
您可以使用MSDN頁面[依賴屬性回調和驗證](https://msdn.microsoft.com/en-us/library/ms745795(v = vs.110).aspx)中描述的「ValidateValueCallback」 – Rachel