【发布时间】：2012-03-28 07:42:30
【问题描述】：
我想实现一个复选框，该复选框用作全选/全选复选框，但我遇到了一些绑定问题。我对 XAML 和 WPF 并不是很陌生，所以我的代码为什么不起作用对我来说是个谜。我希望你能帮忙。这就是我正在做的事情：
首先，我使用 MVVMLight 和事件到命令标签。
我的视图称为 SetupView.xaml，我的视图模型称为 SetupViewModel.cs
public class SetupViewModel : ViewModelBase
{
private List<FilterOptions> m_informationToShow;
private FilterOptions m_currentSelection;
public List<FilterOptions> InformationToShow
{
get { return m_informationToShow; }
set
{
m_informationToShow = value;
RaisePropertyChanged("InformationToShow");
RaisePropertyChanged("InformationToShowCount");
}
}
public FilterOptions CurrentSelection
{
get { return m_currentSelection; }
set
{
m_currentSelection = value;
RaisePropertyChanged("CurrentSelection");
}
}
}
FilterOptions 对象是我的模型对象。因为你需要它来理解问题，这里显示你需要理解问题的部分：
public class FilterOptions
{
private string m_projectName;
private BugsFilter m_bugsFilter;
private BuildsFilter m_buildsFilter;
private ChangeSetsFilter m_changeSetsFilter;
private ProgressInfoFilter m_progressInfoFilter;
private RisksFilter m_risksFilter;
private bool m_projectHealthFilter;
public bool AllFilterValues
{
get
{
if (m_bugsFilter.AtLeastOneFieldEnabled() ||
m_buildsFilter.AtLeastOneFieldEnabled() ||
m_changeSetsFilter.AtLeastOneFieldEnabled() ||
m_progressInfoFilter.AtLeastOneFieldEnabled() ||
m_risksFilter.AtLeastOneFieldEnabled() ||
m_projectHealthFilter
)
{
return true;
}
else
{
return false;
}
}
set
{
if (value == false)
{
m_bugsFilter.NoInformation();
m_buildsFilter.NoInformation();
m_changeSetsFilter.NoInformation();
m_progressInfoFilter.NoInformation();
m_risksFilter.NoInformation();
m_projectHealthFilter = false;
}
else
{
m_bugsFilter.CompleteInformation();
m_buildsFilter.CompleteInformation();
m_changeSetsFilter.CompleteInformation();
m_progressInfoFilter.CompleteInformation();
m_risksFilter.CompleteInformation();
m_projectHealthFilter = true;
}
}
}
我将继续我的观点：
<UserControl.Resources>
<viewModels:SetupViewModel x:Key="thisViewModel"></viewModels:SetupViewModel>
<DataTemplate x:Key="ProjectEntryTemplate">
<Border Margin="75,20,5,0">
<CheckBox Name="naam" Content="{Binding ProjectName}"
FontFamily="Segoe UI"
FontWeight="Light"
FontSize="24"
IsChecked="{Binding AllFilterValues}"
DataContext="{Binding}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<mvvm:EventToCommand Command="{Binding ProjectListItemCheckedChanged, Source={StaticResource thisViewModel}}"
PassEventArgsToCommand="True"/>
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked">
<mvvm:EventToCommand Command="{Binding ProjectListItemCheckedChanged, Source={StaticResource thisViewModel}}"
PassEventArgsToCommand="True"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</Border>
</DataTemplate>
</UserControl.Resources>
如您所见，我有一个在列表框中使用的数据模板：
<ListBox ItemsSource="{Binding InformationToShow}"
ItemTemplate="{StaticResource ProjectEntryTemplate}"
SelectedIndex="0"
BorderThickness="0">
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<mvvm:EventToCommand Command="{Binding SelectionListboxChanged}"
PassEventArgsToCommand="True"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</ListBox>
除此之外，我在同一个窗口右侧的另一个网格中还有很多复选框。它们都对应于来自 FilterOptions 对象的给定过滤器。在我看来，这就是我正在做的事情：
<StackPanel Orientation="Vertical"
Margin="0,5,0,5">
<CheckBox Name="activeBugs" Content="Active bugs"
FontFamily="Segoe UI"
FontWeight="Light"
FontSize="22"
IsChecked="{Binding CurrentSelection.BugsFilter.ActiveBugs}">
</CheckBox>
<CheckBox Name="resolvedBugs" Content="Resolved bugs"
FontFamily="Segoe UI"
FontWeight="Light"
FontSize="22"
IsChecked="{Binding CurrentSelection.BugsFilter.ResolvedBugs}"/>
<CheckBox Name="bugTrend" Content="Bug trend"
FontFamily="Segoe UI"
FontWeight="Light"
FontSize="22"
IsChecked="{Binding CurrentSelection.BugsFilter.BugTrend}"/>
</StackPanel>
最后但同样重要的是，这是我的视图模型中的命令函数：
RelayCommand m_selectionChanged;
public ICommand SelectionListboxChanged
{
get
{
if (m_selectionChanged == null)
m_selectionChanged = new RelayCommand(param => SelectionListboxChangedExec(param), param => true);
return m_selectionChanged;
}
}
private void SelectionListboxChangedExec(object param)
{
SelectionChangedEventArgs e = (SelectionChangedEventArgs)param;
ListBox b = (ListBox)e.Source;
CurrentSelection = (FilterOptions)b.SelectedItem;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
RelayCommand m_projectCheckedChanged;
public ICommand ProjectListItemCheckedChanged
{
get
{
if (m_projectCheckedChanged == null)
m_projectCheckedChanged = new RelayCommand(param => ProjectListItemCheckedChangedExec(param), param => true);
return m_projectCheckedChanged;
}
}
private void ProjectListItemCheckedChangedExec(object param)
{
RoutedEventArgs e = (RoutedEventArgs)param;
CheckBox checkBox = (CheckBox)e.Source;
FilterOptions dataContext = (FilterOptions)checkBox.DataContext;
if ((bool)checkBox.IsChecked)
dataContext.AllFilterValues = true;
else
{
dataContext.AllFilterValues = false;
}
//var expression = checkBox.GetBindingExpression(ToggleButton.IsCheckedProperty);
//expression.UpdateSource();
}
我真的找不到问题。有谁能帮助我吗？ 非常感谢您的帮助！
提前谢谢大家！
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