数据绑定的逻辑错误：属性似乎不会更新

本文介绍了数据绑定的逻辑错误：属性似乎不会更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 大家好， 我有这个XAML < 边框 CornerRadius = 10 已移除 = {Binding SelColor，Mode = OneWay} BorderBrush = 黑色 BorderThickness = 1 保证金 = 7 > < 矩形 MinHeight = 20 MinWidth = 180 填充 = 透明 / > < / Border > < Expander 标题 = ChooseColor 扩展 = Expander_Expanded 名称 = Exp 已折叠 = Exp_Collapsed > < StackPanel > < StackPanel 方向 = 水平 保证金 = 2 > < TextBlock 文字 = R 前景 = {Binding Foreground} / > < 滑块 已移除 = {Dynami cResource RedSliderGrad} 最小 = 0 最大 = 255 MinWidth = 180 值 = {Binding SelColor。 Color.R，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged} ValueChanged = Slider_ValueChanged / > < / StackPanel > < StackPanel 方向 = 水平 保证金 = 2 > < TextBlock 文本 = G 前景 = {Binding Fore地面} / > < Slider 已删除 = {DynamicResource GreenSliderGrad} 最小 = 0 最大 = 255 MinWidth = 180 值 = {Binding SelColo r.Color.G，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged} ValueChanged = Slider_ValueChanged / > < / StackPanel > < StackPanel 方向 = 水平 保证金 = 2 > < TextBlock 文本 = B 前景 = {Binding Foreground} / > < 滑块 已移除 = {DynamicResource BlueSliderGrad} 最小 = 0 最大 = 255 MinWidth = 180 值 = {Binding SelColor.Color.B，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged} ValueChanged = Slider_ValueChanged / > < / StackPanel > < / StackPanel > < / Expander > < / StackPanel > 和这个C＃代码： public SolidColorBrush SelColor { get { return （的SolidColorBrush）的GetValue（SelColorProperty）; } set { SetValue（SelColorProperty， value ）; if （PropertyChanged！= null ） PropertyChanged（ this ， new PropertyChangedEventArgs（ SelColor））; } } // 使用DependencyProperty作为后盾商店为SelColor。这样可以实现动画，样式，装订等...... public static readonly DependencyProperty SelColorProperty = DependencyProperty.Register（ SelColor， typeof （SolidColorBrush）， typeof （ColorChooser）， new PropertyMetadata（ new SolidColorBrush（Color.FromArgb（ 255 ， 204 ， 204 ， 204 ））） ）; public ColorChooser（） { InitializeComponent（）; this .DataContext = this ; } private void Expander_Expanded（ object sender，RoutedEventArgs e） { // this.Exp.IsExpanded = true; // this.Height + = this.Exp .ActualHeight; } private void Exp_Collapsed（ object sender，RoutedEventArgs e） { // this.Exp.IsExpanded = true; // this .Height - = this.Exp.ActualHeight; // this.Exp.IsE xpanded = false; } public event PropertyChangedEventHandler PropertyChanged; private void Slider_ValueChanged（对象发​​件人，RoutedPropertyChangedEventArgs< double> e） { } 我注意到，随着滑块的变化，甚至SelColor也会发生变化，但是边框的背景并没有反映出这种变化......为什么？ 谢谢！ Jymmy097 解决方案 颜色 SolidColorBrush 是 struct ，而不是类，所以你无法以与类相同的方式绑定到它，因为当它被绑定引用时，它会得到 的 SelColor.Color 来自 SolidColorBrush ，与 >颜色 Hi everybody,I have this XAML<Border CornerRadius="10" removed="{Binding SelColor, Mode=OneWay}" BorderBrush="Black" BorderThickness="1" Margin="7"> <Rectangle MinHeight="20" MinWidth="180" Fill="Transparent" /> </Border> <Expander Header="ChooseColor" Expanded="Expander_Expanded" Name="Exp" Collapsed="Exp_Collapsed"> <StackPanel> <StackPanel Orientation="Horizontal" Margin="2"> <TextBlock Text="R" Foreground="{Binding Foreground}"/> <Slider removed="{DynamicResource RedSliderGrad}" Minimum="0" Maximum="255" MinWidth="180" Value="{Binding SelColor.Color.R, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ValueChanged="Slider_ValueChanged"/> </StackPanel> <StackPanel Orientation="Horizontal" Margin="2"> <TextBlock Text="G" Foreground="{Binding Foreground}"/> <Slider removed="{DynamicResource GreenSliderGrad}" Minimum="0" Maximum="255" MinWidth="180" Value="{Binding SelColor.Color.G, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ValueChanged="Slider_ValueChanged"/> </StackPanel> <StackPanel Orientation="Horizontal" Margin="2"> <TextBlock Text="B" Foreground="{Binding Foreground}"/> <Slider removed="{DynamicResource BlueSliderGrad}" Minimum="0" Maximum="255" MinWidth="180" Value="{Binding SelColor.Color.B, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ValueChanged="Slider_ValueChanged"/> </StackPanel> </StackPanel> </Expander> </StackPanel>and this C# code:public SolidColorBrush SelColor { get { return (SolidColorBrush)GetValue(SelColorProperty); } set { SetValue(SelColorProperty, value); if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelColor")); } } // Using a DependencyProperty as the backing store for SelColor. This enables animation, styling, binding, etc... public static readonly DependencyProperty SelColorProperty = DependencyProperty.Register("SelColor", typeof(SolidColorBrush), typeof(ColorChooser), new PropertyMetadata(new SolidColorBrush(Color.FromArgb(255, 204, 204, 204)))); public ColorChooser() { InitializeComponent(); this.DataContext = this; } private void Expander_Expanded(object sender, RoutedEventArgs e) { //this.Exp.IsExpanded = true; //this.Height += this.Exp.ActualHeight; } private void Exp_Collapsed(object sender, RoutedEventArgs e) { //this.Exp.IsExpanded = true; //this.Height -= this.Exp.ActualHeight; //this.Exp.IsExpanded = false; } public event PropertyChangedEventHandler PropertyChanged; private void Slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { }I noticed that, as the slider changes, even the SelColor changes, but that changement is not reflected by the background of the border... Why?Thanks!Jymmy097 解决方案 The Color of a SolidColorBrush is a struct, not a class, so you can't bind to it the same way as a class, because when it is referenced by the binding, it gets a copy of the SelColor.Color from the SolidColorBrush, not the same actual instance of the Color. 这篇关于数据绑定的逻辑错误：属性似乎不会更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！