Silverlight数据绑定转换示例

最新推荐文章于 2025-07-25 15:36:52 发布

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最新推荐文章于 2025-07-25 15:36:52 发布

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本文链接：https://blog.youkuaiyun.com/zhangtaoxgu/article/details/9066587

本文介绍了一个使用Silverlight进行数据绑定的例子，其中包括一个状态枚举类型TrafficStatus和一个TrafficLight类，该类实现了INotifyPropertyChanged接口以支持数据绑定。此外，还定义了一个颜色转换器ColorConverter用于将TrafficStatus转换为对应的信号灯颜色。

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 <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <local:ColorConverter x:Key="ColorConverter"></local:ColorConverter>
        </Grid.Resources>

        <Ellipse Width="300" Height="200" Fill="{Binding Status,Converter={StaticResource ColorConverter},Mode=TwoWay}"></Ellipse>

    </Grid>

public enum TrafficStatus
    {
        Stop,Ready,Go
    }

    public class TrafficLight : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public TrafficStatus Status
        {
            get { return status; }
            set
            {
                status = value;
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("status"));
                }
            }
        }

        private TrafficStatus status;
    }

    public class ColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            TrafficStatus status = (TrafficStatus)value;
            SolidColorBrush brush = new SolidColorBrush(Colors.Red);
            switch (status)
            {
                case TrafficStatus.Stop:
                    break;
                case TrafficStatus.Ready:
                    brush = new SolidColorBrush(Colors.Orange);
                    break;
                case TrafficStatus.Go:
                    brush = new SolidColorBrush(Colors.Green);
                    break;
                default:
                    break;
            }
            return brush;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            TrafficLight traffic = new TrafficLight()
            {
                Status = TrafficStatus.Stop
            };
            this.DataContext = traffic;
        }

Silverlight数据绑定转换.rar