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我有一个WPF数据网格，我已经绑定了一个observablecollection。它工作正常，但问题是我在运行时在单元级别应用样式。下面提到了一个示例方法ApplyStyleAtCellLevelInDataGrid（）。我必须调用这个方法两次才能显示WPF DataGrid中的样式的效果。为什么会这样......WPF Datagrid WPF样式问题
这里是XAML
<Style x:Key="BaseStyle" TargetType="{x:Type TextBlock}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="FontSize" Value="10"/>
<Setter Property="TextAlignment" Value="Center"/>
</Style>
<Style TargetType="{x:Type TextBlock}" x:Key="Col1Style" BasedOn="{StaticResource BaseStyle}">
<Setter Property="Background">
<Setter.Value>
<SolidColorBrush Color="Tomato"/>
</Setter.Value>
</Setter>
<Style.Triggers>
<EventTrigger RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard HandoffBehavior="Compose">
<Storyboard TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)">
<ColorAnimation Duration="0:0:1.5" To="DarkRed" AutoReverse="True" RepeatBehavior="1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
<风格X：键= “DGCellStyle” 的TargetType = “{x：类型DataGridCell}”>
<Setter Property="BorderThickness" Value="0" />
<Setter Property="FontSize" Value="10"></Setter>
<Setter Property="Foreground" Value="Black"></Setter>
</Style>
电网宣言在XAML
<DataGrid Name="dataGrid1" ItemsSource="{Binding Values}" CellStyle="{StaticResource DGCellStyle}" SnapsToDevicePixels="True" UseLayoutRounding="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Value" Binding="{Binding Value1, Mode=OneWay, NotifyOnTargetUpdated=True}" Width="0.25*"/>
<DataGridTextColumn Header="Value 1" Binding="{Binding Value2, Mode=OneWay, NotifyOnTargetUpdated=True}" Width="0.25*"/>
<DataGridTextColumn Header="Value 2" Binding="{Binding Value3, Mode=OneWay, NotifyOnTargetUpdated=True}" Width="0.25*"/>
<DataGridTextColumn Header="Value 3" Binding="{Binding Value4, Mode=OneWay, NotifyOnTargetUpdated=True}" Width="0.25*"/>
</DataGrid.Columns>
</DataGrid>
代码
private void ApplyStyleAtCellLevelInDataGrid()
{
if (Values == null || Values.Count == 0)
{
Values = new ObservableCollection<MyClass>();
Values.Add(new MyClass { Value1 = "1", Value4 = "2", Value2 = "4", Value3 = "3" });
Values.Add(new MyClass { Value1 = "2", Value4 = "3", Value2 = "5", Value3 = "7" });
Values.Add(new MyClass { Value1 = "3", Value4 = "4", Value2 = "7", Value3 = "2" });
Values.Add(new MyClass { Value1 = "4", Value4 = "4", Value2 = "8", Value3 = "6" });
}
else
{
foreach (var item in Values)
{
MyClass c = item as MyClass;
c.Value1 = _rand.Next(0, 100).ToString();
c.Value2 = _rand.Next(0, 100).ToString();
c.Value3 = _rand.Next(0, 100).ToString();
c.Value4 = _rand.Next(0, 100).ToString();
}
}
//////////////
DataGridCell cell = GetCell(1, 1);
Style defaultStyle = (Style)FindResource("NewStyle");
((TextBlock)cell.Content).Style = defaultStyle;
cell = GetCell(1, 2);
defaultStyle = (Style)FindResource("NewStyleExtended");
((TextBlock)cell.Content).Style = defaultStyle;
cell = GetCell(2, 2);
defaultStyle = (Style)FindResource("NewStyle");
((TextBlock)cell.Content).Style = defaultStyle;
cell = GetCell(2, 3);
defaultStyle = (Style)FindResource("Col1Style");
((TextBlock)cell.Content).Style = defaultStyle;
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
// Single call of this method does not work,
I have to call two times then it shows the effect
ApplyStyleAtCellLevelInDataGrid();
ApplyStyleAtCellLevelInDataGrid();
}
感谢您的回答，但我的邮件的问题是，为什么我叫ApplyStyleAtCellLevelInDataGrid（） ;在Window_Loaded事件中使用2次来显示样式的效果？调用它一次不会在屏幕上显示任何东西 –
@AsadNaeem我最好的猜测是它与WPF的[DispatcherPriority]（http://msdn.microsoft.com/en-us/library/system.windows.threading）有关。 dispatcherpriority.aspx），并且第一次运行是创建'Grid'绑定的'Values'集合，并且DataGrid项目还没有完成渲染，或者在渲染过程和覆盖过程中应用了默认样式你的自定义风格，所以这就是为什么需要第二次运行。不过，如果不设置测试场景，我也不会知道。 – Rachel