При загрузке данных из БД возникает исключение InvalidOperationException с сообщением: Элемент коллекции должен быть пустым перед использованием ItemsSource. Знаю, что для заполнения DataGrid можно использовать коллекции Items или ItemsSource, но одновременно их использовать нельзя: если задано значение для свойства ItemsSource и в коде C# добавляется элемент в Items, возникает исключение. |
Опубликован: 08.07.2011 | Доступ: свободный | Студентов: 1788 / 93 | Оценка: 4.15 / 4.08 | Длительность: 15:28:00
Тема: Программирование
Специальности: Программист, Архитектор программного обеспечения
Теги:
Дополнительный материал 2:
Коды и XAML описания документов
Шаблон данных ListBoxItemPhotoDataTemplate
<DataTemplate x:Key="ListBoxItemPhotoDataTemplate"> <Border Padding="10" Background="{StaticResource PhotoBGSolidBrush}" CornerRadius="5"> <Border BorderBrush="{StaticResource PhotoBorderSolidBrush}" BorderThickness="1"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Image Grid.Column="0" Source="{Binding Path=Picture, Mode=OneWay, Converter={StaticResource ImageConverter}}" Height="87" Width="60" Margin="5" Name="Image" Stretch="Uniform" /> <StackPanel Grid.Column="1" Orientation="Vertical"> <TextBlock Text="{Binding Path=EmployeeSurname}" Margin="5,5,5,5" /> <TextBlock Text="{Binding Path=EmployeeName}" Margin="5" /> <TextBlock Text="{Binding Path=EmployeePatronymic}" Margin="5" /> </StackPanel> </Grid> </Border> </Border> </DataTemplate>
XAML-разметка стиля ButtonStyle
<Style x:Key="ButtonStyle" TargetType="Button"> <Setter Property="Background" Value="#FF1F3B53"/> <Setter Property="Foreground" Value="#FF000000"/> <Setter Property="Padding" Value="3"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="BorderBrush"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFA3AEB9" Offset="0"/> <GradientStop Color="#FF8399A9" Offset="0.375"/> <GradientStop Color="#FF718597" Offset="0.375"/> <GradientStop Color="#FF617584" Offset="1"/> </LinearGradientBrush> </Setter.Value> </Setter> <Setter Property="Template"> <Setter.Value> <!—Определение вложенного свойства ControlTemplate --> </Setter.Value> </Setter> </Style>
Шаблон ControlTemplate для Button
<ControlTemplate TargetType="Button"> <Grid Cursor="Hand"> <VisualStateManager.VisualStateGroups> <!—Описание состояний и поведения в этих состояниях --> </VisualStateManager.VisualStateGroups> <Border x:Name="Background" CornerRadius="3" Background="White" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"> <Grid Background="{TemplateBinding Background}" Margin="1"> <Border x:Name="BackgroundAnimation" Opacity="0" Background="#FF448DCA" /> <Rectangle x:Name="BackgroundGradient" > <Rectangle.Fill> <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1"> <GradientStop Color="#FFFFFFFF" Offset="0" /> <GradientStop Color="#F9FFFFFF" Offset="0.375" /> <GradientStop Color="#E5FFFFFF" Offset="0.625" /> <GradientStop Color="#C6FFFFFF" Offset="1" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> </Grid> </Border> <ContentPresenter x:Name="contentPresenter" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}"/> <Rectangle x:Name="DisabledVisualElement" RadiusX="3" RadiusY="3" Fill="#FF95A0A3" Opacity="0" IsHitTestVisible="false" /> <Rectangle x:Name="FocusVisualElement" RadiusX="2" RadiusY="2" Margin="1" Stroke="#FF6DBDD1" StrokeThickness="1" Opacity="0" IsHitTestVisible="false" /> <Rectangle x:Name="MouseOverVisualElement" RadiusX="3" RadiusY="3" Margin="1" Stroke="#FF346797" StrokeThickness="1" Opacity="1" IsHitTestVisible="false" /> </Grid> </ControlTemplate>
XAML-разметка стиля ButtonStyle
<Style x:Key="ButtonStyle" TargetType="Button"> <Setter Property="Background" Value="#FF1F3B53"/> <Setter Property="Foreground" Value="#FF000000"/> <Setter Property="Padding" Value="3"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="BorderBrush"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFA3AEB9" Offset="0"/> <GradientStop Color="#FF8399A9" Offset="0.375"/> <GradientStop Color="#FF718597" Offset="0.375"/> <GradientStop Color="#FF617584" Offset="1"/> </LinearGradientBrush> </Setter.Value> </Setter> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Grid Cursor="Hand"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <!--Изменение цвета рамки (бордюра) кнопки--> <VisualState x:Name="MouseOver"> <Storyboard> <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundAnimation" Storyboard.TargetProperty="Opacity" To="1"/> <!--Изменение цвета рамки (бордюра) кнопки--> <ColorAnimation Duration="0" Storyboard.TargetName="Background" Storyboard.TargetProperty= "(Border.Background).(SolidColorBrush.Color)" To="#FF346797"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#F2FFFFFF"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#CCFFFFFF"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#7FFFFFFF"/> <!--Изменение толщины рамки кнопки--> <DoubleAnimation Duration="0" Storyboard.TargetName="MouseOverVisualElement" Storyboard.TargetProperty="StrokeThickness" To="3"/> </Storyboard> </VisualState> <VisualState x:Name="Pressed"> <Storyboard> <ColorAnimation Duration="0" Storyboard.TargetName="Background" Storyboard.TargetProperty= "(Border.Background).(SolidColorBrush.Color)" To="#FF6DBDD1"/> <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundAnimation" Storyboard.TargetProperty="Opacity" To="1"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" To="#D8FFFFFF"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#C6FFFFFF"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#8CFFFFFF"/> <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty= "(Rectangle.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#3FFFFFFF"/> </Storyboard> </VisualState> <VisualState x:Name="Disabled"> <Storyboard> <DoubleAnimation Duration="0" Storyboard.TargetName="DisabledVisualElement" Storyboard.TargetProperty="Opacity" To=".55"/> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"> <Storyboard> <DoubleAnimation Duration="0" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Opacity" To="1"/> </Storyboard> </VisualState> <VisualState x:Name="Unfocused" /> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Border x:Name="Background" CornerRadius="3" Background="White" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"> <Grid Background="{TemplateBinding Background}" Margin="1"> <Border Opacity="0" x:Name="BackgroundAnimation" Background="#FF448DCA" /> <Rectangle x:Name="BackgroundGradient" > <Rectangle.Fill> <LinearGradientBrush StartPoint=".7,0" EndPoint=".7, 1"> <GradientStop Color="#FFFFFFFF" Offset="0" /> <GradientStop Color="#F9FFFFFF" Offset="0.375" /> <GradientStop Color="#E5FFFFFF" Offset="0.625" /> <GradientStop Color="#C6FFFFFF" Offset="1" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> </Grid> </Border> <ContentPresenter x:Name="contentPresenter" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" VerticalAlignment= "{TemplateBinding VerticalContentAlignment}" HorizontalAlignment= "{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}"/> <Rectangle x:Name="DisabledVisualElement" RadiusX="3" RadiusY="3" Fill="#FF95A0A3" Opacity="0" IsHitTestVisible="false" /> <Rectangle x:Name="FocusVisualElement" RadiusX="2" RadiusY="2" Margin="1" Stroke="#FF6DBDD1" StrokeThickness="1" Opacity="0" IsHitTestVisible="false" /> <Rectangle x:Name="MouseOverVisualElement" RadiusX="3" RadiusY="3" Margin="1" Stroke="#FF346797" StrokeThickness="1" Opacity="1" IsHitTestVisible="false" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>