自定义控件填充颜色不随依赖属性更新 [英] Custom Control Fill Color not updating with Dependency Property

问题描述

我有一个自定义的 wifi 信号强度控件，我正在处理，因此控件由弧形和椭圆形组成.取决于 Wifi 强度的 dbs，每个弧应相应地填充.但是存在一个问题，因为填充颜色没有更新.任何想法将不胜感激.

I have a custom wifi signal strength control, i am working on so the control comprise of arcs and an ellipse. Depends on dbs of Wifi strength, each arc should fill accordingly. But there is a problem as the fill color is not updating. Any idea would be highly appreciated.

XAML

<UserControl x:Class="CustomChartControl.WifiControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:CustomChartControl"
             mc:Ignorable="d" 

            xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing"
            x:Name="_this"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>

        <ed:Arc x:Name="Rate1" Stroke="Gray" ArcThicknessUnit="Pixel" StrokeThickness="1" StartAngle="313" EndAngle="47" Margin="109,110,111,121" Width="80" Stretch="None" ArcThickness="8" Fill="{Binding ElementName=_this,Path=state4Color,UpdateSourceTrigger=PropertyChanged}"/>
        <ed:Arc x:Name="Rate2" Stroke="Gray" ArcThicknessUnit="Pixel" StrokeThickness="1" StartAngle="320" EndAngle="40" Margin="120,124,120,112" Width="60" Stretch="None" ArcThickness="8" Fill="{Binding ElementName=_this,Path=state3Color, UpdateSourceTrigger=PropertyChanged}"/>
        <ed:Arc x:Name="Rate3" Stroke="Gray" ArcThicknessUnit="Pixel" StrokeThickness="1" StartAngle="330" EndAngle="30" Margin="130,138,130,104" Width="40" Stretch="None" ArcThickness="8" Fill="{Binding ElementName=_this,Path=state2Color, UpdateSourceTrigger=PropertyChanged}"/>
        <Ellipse x:Name="Rate4" Stroke="Gray" StrokeThickness="1" Width="8" Height="8" Margin="146,150,146,142" Fill="{Binding ElementName=_this,Path=state1Color,UpdateSourceTrigger=PropertyChanged}"/>
    </Grid>
</UserControl>

代码隐藏

namespace CustomChartControl
{
    /// <summary>
    /// Interaction logic for WifiControl.xaml
    /// </summary>
    public partial class WifiControl : UserControl
    {
        private static readonly DependencyProperty State1Color = DependencyProperty.Register("State1Color", typeof(Brush), typeof(WifiControl));
        public Brush state1Color
        {
            get { return (Brush)this.GetValue(State1Color); }
            set { this.SetValue(State1Color, value); }

        }
        private static readonly DependencyProperty State2Color = DependencyProperty.Register("State2Color", typeof(Brush), typeof(WifiControl));
        public Brush state2Color
        {
            get { return (Brush)this.GetValue(State2Color); }
            set { this.SetValue(State2Color, value); }

        }
        private static readonly DependencyProperty State3Color = DependencyProperty.Register("State3Color", typeof(Brush), typeof(WifiControl));
        public Brush state3Color
        {
            get { return (Brush)this.GetValue(State3Color); }
            set { this.SetValue(State3Color, value); }

        }
        private static readonly DependencyProperty State4Color = DependencyProperty.Register("State4Color", typeof(Brush), typeof(WifiControl));
        public Brush state4Color
        {
            get { return (Brush)this.GetValue(State4Color); }
            set { this.SetValue(State4Color, value); }

        }
        public int WifiStrength { get; set; }

        public WifiControl()
        {
            InitializeComponent();
        }

        private void WifiSignalStrength()
        {
            var searcher=new ManagementObjectSearcher(@"root\WMI", "select Ndis80211ReceivedSignalStrength from MSNdis_80211_ReceivedSignalStrength where active=true");
            ManagementObjectCollection Adapters = searcher.Get();
            foreach(ManagementObject mo in Adapters)
            {
                WifiStrength = Convert.ToInt32(mo["Ndis80211ReceivedSignalStrength"].ToString());

            }
        }
    }
}

我把它添加到主窗口

<Window>
<Grid>
        <local:WifiControl HorizontalAlignment="Left" Height="312" Margin="709,196,0,0" VerticalAlignment="Top" Width="309" state1Color="Blue" state2Color="Cyan",state3Color="Red",state4Color="Orange" />

    </Grid>
</Window>

但它没有更新它的颜色.这段代码有什么问题.任何想法谢谢

But its not updating its colors. Whats wrong with this code. Any Idea Thanks

推荐答案

您必须遵守依赖属性命名约定，其中 DependencyProperty 标识符字段的命名类似于带有 Property 后缀的属性:

You must adhere to dependency property naming conventions, where the DependencyProperty identifier field is named like the property with a Property suffix:

private static readonly DependencyProperty State1ColorProperty =
    DependencyProperty.Register(nameof(State1Color), typeof(Brush), typeof(WifiControl));

public Brush State1Color
{
    get { return (Brush)GetValue(State1ColorProperty); }
    set { SetValue(State1ColorProperty, value); }
}

绑定应该如下所示.设置 UpdateSourceTrigger=PropertyChanged 毫无意义.

The Binding should then look like shown below. Setting UpdateSourceTrigger=PropertyChanged is pointless.

Fill="{Binding ElementName=_this, Path=State1Color}"

或

Fill="{Binding State1Color, ElementName=_this}"

或

Fill="{Binding State1Color, RelativeSource={RelativeSource AncestorType=UserControl}}"

<小时>

我还建议将您的属性重命名为 StateXBrush 而不是 StateXColor，因为它们是画笔，而不是颜色.

---

I'd also recommand to rename your properties to StateXBrush instead of StateXColor, because they are Brushes, not Colors.

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