I have some problem in wpf application.
In XAML:
<Expander Header="SomeHeader" Style="{StaticResource ExpanderStyle}" IsExpanded="{Binding ElementName=Errors, Converter={StaticResource visibilityConverter}, Path=IsExpanded}" >
<RichTextBox ScrollViewer.VerticalScrollBarVisibility="Visible" Style="{StaticResource RichTextBoxStyle}" Foreground="Red" IsReadOnly="True">
<FlowDocument>
<Paragraph>
<ItemsControl ItemsSource="{Binding Path=Errors}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" Style="{StaticResource ErrorTextBlockStyle}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Paragraph>
</FlowDocument>
</RichTextBox>
</Expander>
In my ViewModelClass:
private List<string> errors;
public List<string> Errors
{
get { return errors; }
set
{
errors = value;
OnPropertyChanged("Errors");
}
}
在構造函數中:WPF自動展開,則錯誤不行
public MainWindowViewModel()
{
if (IsInDesignMode) return;
Errors = new List<string>();
}
在測試方法:
private void TestExcute()
{
Errors = "Some error";
}
在WPF窗口不顯示這種情況的錯誤消息。但是,如果我在構造函數中更改代碼到下:
public MainWindowViewModel()
{
if (IsInDesignMode) return;
Errors = new List<string>{"errorMessage1", "errorMessage2"};
}
顯示:
errorMessage1
errorMessage2
的原因是什麼?
我有新問題。在這個wpf應用程序中,我也使用了Expander控件。如何創建自動展開,然後Errors.count> 0?
創建轉換器:
公共類VisibilityConverter:的IValueConverter { 公共對象轉換(對象的值,類型TARGETTYPE, 對象參數,System.Globalization.CultureInfo培養) { 的LoadFile的loadFile =(的LoadFile)值;
if (loadingFile.ExcelErrors.Count > 0)
{
return Visibility.Visible;
}
else
{
return Visibility.Collapsed;
}
}
public object ConvertBack(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
LoadFile是一個聲明Errors屬性的類。
拉法爾,非常感謝你,我想也是 – user2588686