WPF转换器

学习测试了别人写的转换器，记录一下：

1、定义数据源类型：

public class ConverterViewModel
{
    public IList<ColorInfo> ColorList { get; set; }
    public int SelectedColor { get; set; }
    public ConverterViewModel()
    {
        ColorList = new List<ColorInfo>()
        {
            new ColorInfo() {ID = 0,Name = "red"},
            new ColorInfo() {ID = 1,Name = "green"},
            new ColorInfo() {ID = 2,Name = "blue" }
        };
        SelectedColor = 0;
    }
}

public class ColorInfo
{
    public int ID { get; set; }
    public string Name { get; set; }
}
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2、定义转换器

public class ColorConverter : IValueConverter
{
    public static Color[] ColorCollection = new Color[]
    {
        Color.FromRgb(255,0,0),
        Color.FromRgb(0,255,0),
        Color.FromRgb(0,0,255)
    };

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null)
        {
            return new SolidColorBrush(ColorCollection[0]);
        }
        try
        {
            return new SolidColorBrush(ColorCollection[(int)value]);
        }
        catch (Exception)
        {
            return new SolidColorBrush(ColorCollection[0]);
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}
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3、XAML代码：

<ComboBox  Cursor="Hand" Name="ComboBox_ColorSelect" Height="25" Width="80"
 ItemsSource="{Binding ColorList}" SelectedValuePath="ID"  DisplayMemberPath="Name" 
 SelectedValue="{Binding SelectedColor}"/>
 
    <TextBlock Background="{Binding SelectedValue,ElementName=ComboBox_ColorSelect,Converter={StaticResource ColorConverter}}" 
    Height="25" Width="80"/>
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4、xaml.cs代码：

public MainWindow()
    {
        InitializeComponent();
        this.DataContext = new ConverterViewModel();
    }
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