Question

我正在尝试动态更改WPF DataGrid的SelectionBackground。我尝试绑定它，但是没有用。我终于找到了以下内容，但我仍然无法提供动态的“白色停止”。我真正想要的是直接绑定到LinearGradientBrush，随着情况的变化，我可以变亮和变暗但我会决定如何将“白色停止”绑定到动态变化的东西。

            <DataGrid.Resources>

                <SolidColorBrush x:Key="SelectionBackgroundColorKey" />
                <LinearGradientBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Color="{Binding Source={StaticResource SelectionBackgroundColorKey}, Path=Color}" Offset="0.0" />
                    <GradientStop Color="White" Offset="0.3" />
                    <GradientStop Color="{Binding Source={StaticResource SelectionBackgroundColorKey}, Path=Color}" Offset="1.0" />
                </LinearGradientBrush>

                <SolidColorBrush x:Key="SelectionTextColorKey" Color="Black" />
                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="{Binding Source={StaticResource SelectionTextColorKey}, Path=Color}" />
            </DataGrid.Resources>

CodeBehind片段：

    private void DataGridReservationsSelectionChanged(object argSender, SelectionChangedEventArgs argEvtArgs)
    {
        Color localBackgroundColorKey = ApplicationSettings.ReservationNormalSelectedBackgroundColor;
        Color localTextColorKey = ApplicationSettings.ReservationNormalSelectedTextColor;

        Reservation localReservation = dataGridReservations.SelectedItem as Reservation;

        if (localReservation == null)
        {
            return;
        }

        if (localReservation.IsArrived)
        {
            localBackgroundColorKey = ApplicationSettings.ReservationArrivedSelectedBackgroundColor;
            localTextColorKey = ApplicationSettings.ReservationArrivedSelectedTextColor;
        }
        else if (localReservation.IsCanceled)
        {
            localBackgroundColorKey = ApplicationSettings.ReservationCanceledSelectedBackgroundColor;
            localTextColorKey = ApplicationSettings.ReservationCanceledSelectedTextColor;
        }
        ... etc...
        ((SolidColorBrush)dataGridReservations.Resources["SelectionBackgroundColorKey"]).Color = localBackgroundColorKey;
        ((SolidColorBrush)dataGridReservations.Resources["SelectionTextColorKey"]).Color = localTextColorKey;


    }

Answer 1

我想出了我想要的东西。如果我向DataGrid资源添加更多的Key颜色，我可以在LinearGradientBrush中使用它们。

即

<SolidColorBrush x:Key="SelectionBackgroundColorKey" />
<SolidColorBrush x:Key="SelectionBackgroundWhiteStopKey" /> <!-- Added a WhiteStopKey to the resources -->
<LinearGradientBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" StartPoint="0,0" EndPoint="0,1">
    <GradientStop Color="{Binding Source={StaticResource SelectionBackgroundColorKey}, Path=Color}" Offset="0.0" />
    <GradientStop Color="{Binding Source={StaticResource SelectionBackgroundWhiteStopKey}, Path=Color}" Offset="0.3" /> <!-- Use the WhiteStopKey in the LinearGradientBrush -->
    <GradientStop Color="{Binding Source={StaticResource SelectionBackgroundColorKey}, Path=Color}" Offset="1.0" />
</LinearGradientBrush>

...然后，在代码中......

((SolidColorBrush)dataGridReservations.Resources["SelectionBackgroundColorKey"]).Color = localBackgroundColorKey;
((SolidColorBrush)dataGridReservations.Resources["SelectionBackgroundWhiteStopKey"]).Color = localBackgroundColorKey.Lighten(1.7F);

注意：Color.Lighten（）是我编写的扩展方法，而不是Framework方法。

用来解释：绝望是发明的母亲。

如何将SelectionBackgroundColorKey绑定到LinearGradientBrush？

1 个答案: