Question

我有一个包含多个列的DataGrid。其中一些列类似于

state|Color1|Color2|Color3|...

我想这样做：

If state==1 => RowForeground = Color1
If state==2 => RowForeground = Color2
If state==3 => RowForeground = Color3
...

我能想到的第一个解决方案是使用多个数据触发器：

<DataTrigger Binding="{Binding Path=state}" Value="0">
    <Setter Property="Foreground" Value="{Binding Path=color0, Converter={StaticResource str2clrConverter}}"/>                            
</DataTrigger>

<DataTrigger Binding="{Binding Path=state}" Value="1">
    <Setter Property="Foreground" Value="{Binding Path=color1, Converter={StaticResource str2clrConverter}}"/>                            
</DataTrigger>

<DataTrigger Binding="{Binding Path=state}" Value="2">
    <Setter Property="Foreground" Value="{Binding Path=color2, Converter={StaticResource str2clrConverter}}"/>                            
</DataTrigger>

[...]

有更好的解决方案吗？

Answer 1

Multibinding就是这样！

我在这里解决了：

<Setter Property="Foreground">
    <Setter.Value>
        <MultiBinding Converter="{StaticResource frgConverter}">
            <Binding Path="state"/>

            <Binding Path="color1"/>
            <Binding Path="color2"/>
            <Binding Path="color3"/>
        </MultiBinding>
    </Setter.Value>
</Setter>

转换器：

public class GridForegroundConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        int iColor;
        int nState = System.Convert.ToInt32(values[0]);

        if (nState < 0 || nState > 3)
            throw new ArgumentOutOfRangeException("State");

        iColor = System.Convert.ToInt32(values[nState + 1]);

        byte[] bytes = BitConverter.GetBytes(iColor);
        Color color = Color.FromRgb(bytes[2], bytes[1], bytes[0]);

        return new SolidColorBrush(color);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

WPF Datagrid - 与其他列相关的列绑定

1 个答案: