WPF多值绑定及多值转换（MultiBinding和IMultiValueConverter）

WPF可以使用MultiBinding进行多值绑定，使用IMultiValueConverter进行多值转换

例：

（1）转换器

public class ContentConverter : IMultiValueConverter
{
    //源属性传给目标属性时，调用此方法ConvertBack
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values == null || values.Length == 0)
            throw new ArgumentNullException("values can not be null");
 
        string s = "";
        foreach (var item in values)
        {
            s += System.Convert.ToString(item);
        }
 
        return s;
    }
 
    //目标属性传给源属性时，调用此方法ConvertBack
    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        return null;
    }
}

（2）绑定

<Window.Resources>
    <local:ContentConverter x:Key="content"></local:ContentConverter>
</Window.Resources>
<Grid>
    <Label HorizontalAlignment="Left" Height="23" Margin="243,208,0,0" Foreground="{Binding Status,Converter={StaticResource foreColor},Mode=OneWay}" VerticalAlignment="Top" Width="120">
        <Label.Content>
            <MultiBinding Converter="{StaticResource content}">
                <Binding Path="Str1"/>
                <Binding Path="Str2"/>
                <Binding Path="Str3"/>
            </MultiBinding>
        </Label.Content>
    </Label>
    <Button Content="Button" HorizontalAlignment="Left" Margin="35,44,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
</Grid>

（3）button click事件

private void Button_Click(object sender, RoutedEventArgs e)
{
    window2ViewModel.Str1 = "1";
    window2ViewModel.Str2 = "2";
    window2ViewModel.Str3 = "3";
}