WPF与资源字典的绑定问题

时间:2011-07-22 18:52:16

标签: wpf resources

我开发了一个自定义数据网格控件。这个控件有两个部分,一个是数据网格本身使用的自定义模板,另一个是我的自定义控件,它将标题区域添加到数据网格。

我有一个名为CustomDataGrid的类,这里是XAML。

<UserControl x:Class="MDT_Designer.Presentation.ScreenControls.CustomDataGrid"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         Name="CDataGrid" >
<UserControl.Resources>
    <ResourceDictionary x:Key="Dictionary" Source="CustomizedControls.xaml"/>
</UserControl.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="{Binding ElementName=CDataGrid, Path=TitleAreaHeight}"/>
        <RowDefinition Height="{Binding ElementName=CDataGrid, Path=GridAreaHeight}"/>
    </Grid.RowDefinitions>
    <Grid Name="TitleArea" DockPanel.Dock="Top" Background="{Binding ElementName=CDataGrid, Path=TitleBackColor}" >
        <Viewbox HorizontalAlignment="{Binding ElementName=CDataGrid, Path=TitleAlignment}">
            <TextBlock Name="TitleText" Text="{Binding ElementName=CDataGrid, Path=Title}" Margin="2,0,0,0" FontFamily="{Binding ElementName=CDataGrid, Path=TitleFontFamily}" Foreground="{Binding ElementName=CDataGrid, Path=TitleTextColor}"/>
        </Viewbox>
    </Grid>
    <DataGrid Name="DataGridArea" Grid.Row="1" IsReadOnly="True" HorizontalGridLinesBrush="DarkGray" VerticalGridLinesBrush="DarkGray" VerticalScrollBarVisibility="Visible" Background="AliceBlue" >
    </DataGrid>
</Grid>
</UserControl>

在我的CustomDataGrid.xaml.cs文件中,我已经定义了属性。

    public static DependencyProperty TitleAlignmentProperty = DependencyProperty.Register("TitleAlignment", typeof(HorizontalAlignment), typeof(CustomDataGrid));
    public HorizontalAlignment TitleAlignment
    {
        get { return (HorizontalAlignment)base.GetValue(TitleAlignmentProperty); }
        set { base.SetValue(TitleAlignmentProperty, value); }
    }

我只是展示一个作为样本,这是有效的。我希望我可以更改XAML中的绑定以摆脱ElementName = CDataGrid,但我作为替代方案的任何方式都不起作用。

现在我的问题。我的数据网格控件本身的自定义模板存储在字典CustomizedControls.xaml。

以下是绑定问题的一个示例。我不得不创建这个资源。

<LinearGradientBrush x:Key="HeaderBackgroundBrush" EndPoint="0.5,1" StartPoint="0.5,0" >
    <GradientStop Color="{DynamicResource {x:Static SystemColors.ControlLightColorKey}}" Offset="0" />
    <GradientStop Color="{DynamicResource {x:Static SystemColors.ControlDarkColorKey}}" Offset="1" />
</LinearGradientBrush>

然后我在列标题的Border定义中使用它。

<Style TargetType="{x:Type DataGridColumnHeader}">
    <Setter Property="VerticalContentAlignment" Value="Center" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                <Grid>
                    <Border x:Name="columnHeaderBorder" BorderThickness="1" Padding="3,0,3,0" 
            Background="{DynamicResource HeaderBackgroundBrush}"> 
                            <Border.BorderBrush>
                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="{DynamicResource BorderLightColor}" Offset="0" />
                                <GradientStop Color="{DynamicResource BorderDarkColor}" Offset="1" />
                            </LinearGradientBrush>
                        </Border.BorderBrush>
                        <ContentPresenter x:Name="columnHeaderPresenter"  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Style="{DynamicResource HeaderContentStyle}" />
                    </Border>

                    <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}" />
                    <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

然后在我的代码后面更改它我必须这样做。

        LinearGradientBrush headerBrush = (LinearGradientBrush)TryFindResource("HeaderBackgroundBrush");
        headerBrush.GradientStops[0] = new GradientStop(brush.Color, 0.0);

我无法更改画笔本身,我只能更改画笔的属性。我已经尝试了我能想到的每种绑定技术,但是当样式在字典中时似乎没有任何效果。

我希望能够做的是以某种方式绑定像BorderLrCloush设置的BorderLightColor,这样在我的代码后面我可以改变它的值。

任何帮助都会使我的一天,这将是我整个周末的事实。感谢。

1 个答案:

答案 0 :(得分:0)

为什么你不能换画笔?您应该能够将画笔引用分配给控件。这不起作用吗? FindResource应该搜索您正在调用它的FrameworkElement的Parent Element,然后搜索树,应用程序资源,然后搜索以System Resources结尾的主题。原谅我的VB ......

Private Sub Button_Click(ByVal sender as Object, ByVal e as System.Windows.RoutedEventArgs)
    Dim MyBrush2 as Brush = Me.FindResource("Brush2")   
    Me.MyRect.Background = MyBrush2
End Sub

窗口内容:

<Window.Resources>
    <LinearGradientBrush x:Key="Brush1" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="Black" Offset="0"/>
        <GradientStop Color="White" Offset="1"/>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="Brush2" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FF0800FF" Offset="0"/>
        <GradientStop Color="Red" Offset="1"/>
    </LinearGradientBrush>
</Window.Resources>

<Grid x:Name="LayoutRoot">
    <Grid x:Name="MyRect" HorizontalAlignment="Left" Margin="63,66,0,174" Width="242" Background="{DynamicResource Brush1}" />
    <Button Content="Button" HorizontalAlignment="Right" Height="60" Margin="0,117,95,0" VerticalAlignment="Top" Width="156" Click="Button_Click"/>
</Grid>