如何更新wpf应用程序？ [英] how to update a wpf application?

问题描述

在wpf：

我创建了一个滑块并将其绑定到窗口背景。其代码为：

in wpf:
I created a slider and bind it to window background.here is the code:

Value="{Binding Path=Background.Color.B, ElementName=windowhelp, Mode=TwoWay}"

现在当我运行窗口并更改滑块值时，窗口背景不会变化！

如何在更改滑块值时更改窗口背景？

now when I run window and change the slider value , window background does not ghange!
how can I change window background when I change the slider value?

推荐答案

这是我解决问题的方法：



MainWindow.cs：

Hi,

This is my solution for the problem:

MainWindow.cs:

<Window x:Class="WpfApplication3.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WpfApplication3"

        Title="MainWindow" Height="350" Width="525" x:Name="window" removed="LightBlue">
    <Window.Resources>
        <local:BrushToIntConverter x:Key="BrushToIntConverter" />
    </Window.Resources>
    <DockPanel>
        <Slider DockPanel.Dock="Top" Minimum="0" Maximum="256" Value="{Binding Path=Background, ElementName=window, Mode=TwoWay, Converter={StaticResource  ResourceKey=BrushToIntConverter}, ConverterParameter=R}"/>
        <Slider DockPanel.Dock="Top" Minimum="0" Maximum="256" Value="{Binding Path=Background, ElementName=window, Mode=TwoWay, Converter={StaticResource  ResourceKey=BrushToIntConverter}, ConverterParameter=G}"/>
        <Slider DockPanel.Dock="Top" Minimum="0" Maximum="256" Value="{Binding Path=Background, ElementName=window, Mode=TwoWay, Converter={StaticResource  ResourceKey=BrushToIntConverter}, ConverterParameter=B}"/>
    </DockPanel>
</Window>

R，G，B三个傻瓜。



和刷到Int转换器：

Three silders for R,G,B.

And the Brush to Int Converter:

[ValueConversion(typeof(System.Windows.Media.Brush), typeof(int))]
public class BrushToIntConverter : IValueConverter
{
    protected System.Windows.Media.Color m_Color = System.Windows.Media.Colors.White;

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        System.Windows.Media.SolidColorBrush brush = value as System.Windows.Media.SolidColorBrush;

        m_Color = brush.Color;

        switch (parameter as string)
        {
            case "R":
                return m_Color.R;
            case "G":
                return m_Color.G;
            case "B":
                return m_Color.B;
        }

        return 0;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int intValue = (int)Math.Round((double)value);

        byte r = m_Color.R;
        byte g = m_Color.G;
        byte b = m_Color.B;

        switch (parameter as string)
        {
            case "R":
                r = (byte)intValue;
                break;
            case "G":
                g = (byte)intValue;
                break;
            case "B":
                b = (byte)intValue;
                break;
        }

        m_Color = new System.Windows.Media.Color() { R = r, G = g, B = b, A = m_Color.A };

        return new System.Windows.Media.SolidColorBrush(m_Color);
    }
}

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