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我有一個WPF數據網格，我已經綁定了一個observablecollection。它工作正常，但問題是我在運行時在單元級別應用樣式。下面提到了一個示例方法ApplyStyleAtCellLevelInDataGrid（）。我必須調用這個方法兩次才能顯示WPF DataGrid中的樣式的效果。爲什麼會這樣......WPF Datagrid WPF樣式問題
這裏是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>
<風格X：鍵= 「DGCellStyle」 的TargetType = 「{x：類型DataGridCell}」>
<Setter Property="BorderThickness" Value="0" />
<Setter Property="FontSize" Value="10"></Setter>
<Setter Property="Foreground" Value="Black"></Setter>
</Style>
電網宣言在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>
代碼
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();
}
感謝您的回答，但我的郵件的問題是，爲什麼我叫ApplyStyleAtCellLevelInDataGrid（） ;在Window_Loaded事件中使用2次來顯示樣式的效果？調用它一次不會在屏幕上顯示任何東西 –
@AsadNaeem我最好的猜測是它與WPF的[DispatcherPriority]（http://msdn.microsoft.com/en-us/library/system.windows.threading）有關。 dispatcherpriority.aspx），並且第一次運行是創建'Grid'綁定的'Values'集合，並且DataGrid項目還沒有完成渲染，或者在渲染過程和覆蓋過程中應用了默認樣式你的自定義風格，所以這就是爲什麼需要第二次運行。不過，如果不設置測試場景，我也不會知道。 – Rachel