UserControl 使用 ComboBox 更改矩形的可见性

Question

我在 UserControl 中有一个组合框，其中有 4 个选项可以更改主窗口中 4 个矩形的可见性。

当 Combobox 在 MainWindow 中时，我设法让它工作，但是当我将它移到 UserControl 时，它就不再工作了

我尝试放入 UserControl MainWindow mw = new MainWindow(); 放在前面

mw.blau_rec.Visibility = Visibility.Visible; -> 这里我得到 Whosebug 错误

这是主窗口中矩形的 XAML：

    <Rectangle x:Name="blau_rec" Visibility="Hidden">
        <Rectangle.Fill>
            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0.2" Color="Aqua"/>
                <GradientStop Offset="1" Color="Blue"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>

    <Rectangle x:Name="orange_rec" Visibility="Hidden">
        <Rectangle.Fill>
            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0.2" Color="Orange"/>
                <GradientStop Offset="1" Color="OrangeRed"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>

    <Rectangle x:Name="grey_rec" Visibility="Hidden">
        <Rectangle.Fill>
            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0.2" Color="#8E8E8E"/>
                <GradientStop Offset="1" Color="#585858"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>

    <Rectangle x:Name="light_rec" Visibility="Hidden">
        <Rectangle.Fill>
            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0.2" Color="#D5D5D5"/>
                <GradientStop Offset="1" Color="#BEBEBE"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>

这是UserControl.cs

中的代码

    private void cbx_colorChanger_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var farbe1 = cbx_colorChanger.SelectedItem as ComboBoxItem;
        if (farbe1.Content.ToString() == "Blau")
        {
            blau_rec.Visibility = Visibility.Visible;
        }
        else
        {
            blau_rec.Visibility = Visibility.Hidden;
        }

        var farbe2 = cbx_colorChanger.SelectedItem as ComboBoxItem;
        if (farbe2.Content.ToString() == "Orange")
        {
            orange_rec.Visibility = Visibility.Visible;
        }
        else
        {
            orange_rec.Visibility = Visibility.Hidden;
        }

        var farbe3 = cbx_colorChanger.SelectedItem as ComboBoxItem;
        if (farbe3.Content.ToString() == "Grau")
        {
            grey_rec.Visibility = Visibility.Visible;
        }
        else
        {
            grey_rec.Visibility = Visibility.Hidden;
        }

        var farbe4 = cbx_colorChanger.SelectedItem as ComboBoxItem;
        if (farbe4.Content.ToString() == "Hell")
        {
            light_rec.Visibility = Visibility.Visible;
        }
        else
        {
            light_rec.Visibility = Visibility.Hidden;
        }
    }

这是用户控件中的组合框：

    <ComboBox x:Name="cbx_colorChanger" Width="200" Height="25" SelectionChanged="cbx_colorChanger_SelectionChanged" >
        <ComboBoxItem Name="cbx_blau_rec" Content="Blau"/>
        <ComboBoxItem Name="cbx_orange_rec" Content="Orange"/>
        <ComboBoxItem Name="cbx_grey_rec" Content="Grau"/>
        <ComboBoxItem Name="cbx_light_rec" Content="Hell"/>
    </ComboBox>

我需要一些帮助来解决这个问题，谢谢！

Answer 1

创建 MainWindow 的静态实例并在构造函数中将其设置为等于此值，如下所示：

public static MainWindow thisWindow;


public MainWindow()
    {
        InitializeComponent();

        thisWindow = this;
    }

现在您可以从任何地方访问主窗口：

MainWindow.thisWindow.blau_rec.Visibility = Visibility.Visible;

UserControl 使用 ComboBox 更改矩形的可见性

UserControl changing Visibility for Rectangles with ComboBox

c#

wpf

user-controls