第一件事我的代码：
MainView.xaml：
<Grid Name="PropoCloud" VerticalAlignment="Bottom" Margin="0 0 0 80">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="FadeStates">
<VisualState x:Name="FadeOut">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="PropoCloud" Storyboard.TargetProperty="PropoCloud.Opacity" From="1" To="0" Duration="0:0:1"/>
</Storyboard>
</VisualState>
<VisualState x:Name="FadeIn">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="PropoCloud" Storyboard.TargetProperty="PropoCloud.Opacity" From="0" To="1" Duration="0:0:2"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<tut:TutorialAwareButton Name="PropoButton"
Command="{Binding CmdCreated}"
BorderThickness="0" VerticalAlignment="Bottom"
HorizontalAlignment="Left" Width="410" Height="200">
<tut:TutorialAwareButton.ContentTemplate>
<DataTemplate>
<Grid>
<Image Source="../Assets/propoCloud.png" Height="168" Width="370"/>
<Grid Width="215" Height="69" HorizontalAlignment="Right" Margin="4">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="140"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid Grid.Column="0">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="4*"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="Suggestion" FontFamily="Segoe UI Light" Foreground="{StaticResource BlueAppBackgroundThemeBrush}"
VerticalAlignment="Center"/>
<StackPanel Grid.Row="1" VerticalAlignment="Bottom">
<TextBlock x:Name="Exemples" TextWrapping="Wrap" FontSize="18" VerticalAlignment="Top" LineHeight="20"
Text=" test test test test tes tes tes testest stestestestests" MaxLines="2"
FontFamily="Segoe UI Light" Foreground="{StaticResource BlueAppBackgroundThemeBrush}"/>
</StackPanel>
</Grid>
</Grid>
</Grid>
</DataTemplate>
</tut:TutorialAwareButton.ContentTemplate>
<tut:TutorialAwareButton.CommandParameter>
<cmd:NavigationCommandParameter TargetName="QuestionCreatingView"></cmd:NavigationCommandParameter>
</tut:TutorialAwareButton.CommandParameter>
</tut:TutorialAwareButton>
</Grid>
MainView.xaml.cs：
int count = 0;
private void Suggestionchange()
{
Exemples.Text = ExemplesQuestions[count];
count++;
if (count == 8) count = 0;
}
private void createExemple()
{
ExemplesQuestions = new List<string>();
ExemplesQuestions.Add("Test1");
ExemplesQuestions.Add("Test2");
ExemplesQuestions.Add("Test3");
ExemplesQuestions.Add("Test4");
ExemplesQuestions.Add("Test5");
ExemplesQuestions.Add("Test6");
ExemplesQuestions.Add("Test7");
ExemplesQuestions.Add("Test8");
}
现在 ！我有一个计时器，它每10秒会尝试使用更改文本SuggestionChange()。实际上它只是说
名称“示例”在当前上下文中不存在
而且我没有找到如何改变它的方法。
您无法访问在DataTemplate中定义的TextBlock。您可以为控件定义一个Dependency属性，并可以访问该属性以显示数据。请参考下面的代码。
class TutorialAwareButton : Button
{
public string RandomString
{
get { return (string)GetValue(RandomStringProperty); }
set { SetValue(RandomStringProperty, value); }
}
public static readonly DependencyProperty RandomStringProperty =
DependencyProperty.Register("RandomString", typeof(string), typeof(TutorialAwareButton), new PropertyMetadata(string.Empty));
}
<local:TutorialAwareButton x:Name="PropoButton"
Command="{Binding CmdCreated}"
BorderThickness="0" VerticalAlignment="Bottom"
HorizontalAlignment="Left" Width="410" Height="200">
<local:TutorialAwareButton.ContentTemplate>
<DataTemplate>
<StackPanel VerticalAlignment="Bottom">
<TextBlock x:Name="Exemples" TextWrapping="Wrap" FontSize="18" VerticalAlignment="Top" LineHeight="20" Text="{Binding ElementName=PropoButton,Path=RandomString}" FontFamily="Segoe UI Light" />
</StackPanel>
</DataTemplate>
</local:TutorialAwareButton.ContentTemplate>
</local:TutorialAwareButton>
您可以在代码中分配如下
private void Suggestionchange()
{
PropoButton.RandomString = ExemplesQuestions[count];
count++;
if (count == 8) count = 0;
}
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