C# WPF中项集合的可见性
我有下拉列表和网格。在网格列中有超链接。如果下拉列表集合包含1项,则下拉列表应不可见。我需要一个逻辑来绑定项集合的可见性 下面是网格中一个超链接的XAMLC# WPF中项集合的可见性,c#,wpf,grid,imultivalueconverter,C#,Wpf,Grid,Imultivalueconverter,我有下拉列表和网格。在网格列中有超链接。如果下拉列表集合包含1项,则下拉列表应不可见。我需要一个逻辑来绑定项集合的可见性 下面是网格中一个超链接的XAML <!--Associate--> <TextBlock Margin="10, 0, 0, 0"> <TextBlock.Visibility>
<!--Associate-->
<TextBlock Margin="10, 0, 0, 0">
<TextBlock.Visibility>
<MultiBinding Converter="{StaticResource courseListVisibilityConverter}"
ConverterParameter="Associate">
<Binding Path="IsCourseAssocited"
RelativeSource="{RelativeSource Mode=FindAncestor,AncestorType={x:Type DPA2:TakenCoursesNotApplied}}" />
<Binding Path="DataContext"
RelativeSource="{RelativeSource Self}" />
</MultiBinding>
</TextBlock.Visibility>
<Hyperlink DataContext="{Binding}"
Name="Associate"
IsEnabled="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TextBlock}}, Path=IsVisible}"
Click="Associate_Click">
<TextBlock TextWrapping="Wrap"
Text="Associate" />
</Hyperlink>
</TextBlock>
public class CourseListVisibilityConverter : IMultiValueConverter
{
public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null || value[0] == null || value[1] == null) return Visibility.Collapsed;
bool IsEditMode = value[0] == DependencyProperty.UnsetValue ? false : (bool)value[0];
if (value[1].GetType() == typeof(Course))
{
Course course = value[1] as Course;
if (course == null) return string.Empty;
//Visibility retVal = Visibility.Visible;
switch (parameter.ToString())
{
case "CodeLink":
if (!IsEditMode) return Visibility.Collapsed;
if (course.HideOptions) return Visibility.Collapsed;
if (course.IsInElectivePool &&
course.IsManualAdd) return Visibility.Visible;
if (!course.IsInElectivePool &&
!course.IsWaived) return Visibility.Visible;
if (course.IsInElectivePool &&
course.FulFillmentId != 0 &&
course.FulFillmentId != -1 &&
!course.IsWaived) return Visibility.Visible;
return Visibility.Collapsed;
case "CodeNoLink":
if (!IsEditMode) return Visibility.Visible;
if (course.HideOptions) return Visibility.Visible;
if (course.IsInElectivePool &&
course.IsManualAdd) return Visibility.Collapsed;
if (!course.IsInElectivePool &&
!course.IsWaived) return Visibility.Collapsed;
if (course.IsInElectivePool &&
course.FulFillmentId != 0 &&
course.FulFillmentId != -1 &&
!course.IsWaived) return Visibility.Collapsed;
return Visibility.Visible;
case "Waive":
if (course.HideOptions) return Visibility.Collapsed;
if (IsEditMode &&
!course.IsWaived &&
!(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &&
!course.IsInElectivePool) return Visibility.Visible;
return Visibility.Collapsed;
case "UndoWaive":
if (course.HideOptions) return Visibility.Collapsed;
if (IsEditMode && course.IsWaived &&
!(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &&
!course.IsInElectivePool) return Visibility.Visible;
return Visibility.Collapsed;
case "UndoAdd":
if (course.HideOptions) return Visibility.Collapsed;
if (IsEditMode && course.IsManualAdd &&
(!(course.RetakenFlag == RetakeFlagType.RetakeOfCourse) &&
!course.IsInElectivePool)) return Visibility.Visible;
return Visibility.Collapsed;
case "Associate":
if (course.HideOptions) return Visibility.Collapsed;
if (IsEditMode && course.IsCourseAssocited)
return Visibility.Collapsed;
else if (IsEditMode &&
((course.Status.ToUpper() == "COMPLETE" || course.Status.ToUpper() == "DROPPED")))
{
return Visibility.Visible;
}
else
{
return Visibility.Collapsed;
}
//case "UnAssociate":
// if (course.HideOptions) return Visibility.Collapsed;
// if (IsEditMode && (course.IsCourseAssocited))
// {
// return Visibility.Visible;
// }
// else
// {
// return Visibility.Collapsed;
// }
case "FullFillRequirement":
if (course.HideOptions) return Visibility.Collapsed;
if (IsEditMode &&
((course.Status.ToUpper() == "FUTURE")))
{
return Visibility.Visible;
}
else
{
return Visibility.Collapsed;
}
default:
return Visibility.Collapsed;
}
}
else if (value[1].GetType() == typeof(ElectivePool))
{
ElectivePool electivePool = value[1] as ElectivePool;
if (electivePool == null) return string.Empty;
switch (parameter.ToString())
{
case "Waive":
if (IsEditMode &&
!electivePool.IsWaived) return Visibility.Visible;
return Visibility.Collapsed;
case "UndoWaive":
if (IsEditMode &&
electivePool.IsWaived) return Visibility.Visible;
return Visibility.Collapsed;
}
}
return Visibility.Visible;
}
public object[] ConvertBack(object value, Type[] targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
}
IsVisible不是TextBlock的属性,需要使用属性;
RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type DPA2:TakenCourseSontaplied}}-除非DPA2:TakenCourseSontaplied类型是文本块上方可视树中的控件,否则不能使用FindAncestor语句。
也许您需要一些值转换器来接受集合中元素的计数并返回可见性。如果计数=1,则将其折叠。您可以将可见性绑定到HasItems属性并使用
或者,我们是否可以在转换器中使用Presentation model中的集合。2.我们是否可以在转换器中使用PresentationModel中发布的属性。我的意思是说,在模型中,我检查集合计数并更新boolena属性。我是否可以在转换器计算中使用相同的属性。是的,您可以在,但不要忘记使用PropertyChanged通知。是示例。您可以使用类似以下内容:CollectionContains RethanoneElement是您的布尔属性,booleanToVisibilityConverter是的实例。此可见性将适用于ComboBox。但我需要超链接的可见性。我已添加了转换器代码。但我是否可以访问转换器中的model属性,以便添加在这里额外检查。这就像一个符咒,但唯一的事情是,如果我立即从列表中删除项目,文本块的可见性应该再次可见,这不会发生,
Visibility="{Binding HasItems,ElementName=ELementName,Converter={StaticResource BooleanToVisibilityConverter}"