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/// 注册依赖属性
public static readonly DependencyProperty aTexTrimAuto =
DependencyProperty.Register("TrimAuto ", typeof(bool), typeof(DPControl),
new PropertyMetadata(false, TrimAutoDel));
//回调函数
private static void TrimAutoDel(DependencyObject obj, DependencyPropertyChangedEventArgs even)
{
var a = (TextBox)obj;
a.Text = (string)even.NewValue;
}