我的数据绑定在我的 DataGrid 中工作正常，但是当我尝试从我的 CollectionViewSource 获取 collectionview 时，它为空，并且我在 DataGrid 中的过滤器不起作用。这是代码：
<Window.Resources>
<CollectionViewSource x:Key="jobItemViewSource" d:DesignSource="{d:DesignInstance my:JobItem, CreateList=True}"/>
</Window.Resources>
<Grid Visibility="Visible" ShowGridLines="False" UseLayoutRounding="True" DataContext="{StaticResource jobItemViewSource}">
<DataGrid Grid.Row="4" Grid.ColumnSpan="6" LoadingRow="jobItemDataGrid_LoadingRow" ItemsSource="{Binding}" Name="jobItemDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" IsReadOnly="True" IsSynchronizedWithCurrentItem="True" AutoGenerateColumns="False" Grid.RowSpan="2">
<DataGrid.Columns>
<DataGridTextColumn x:Name="workOrderNoColumn" Binding="{Binding Path=WorkOrderNo}" Header="Work Order No." Width="75" />
<DataGridTextColumn x:Name="assigneeColumn" Binding="{Binding Path=PrimaryAssignee}" Header="Assignee" Width="80" />
<DataGridTextColumn x:Name="dateReceivedColumn" Binding="{Binding Path=DateReceived}" Header="Date Received" Width="90" />
<DataGridTextColumn x:Name="dueDateColumn" Binding="{Binding Path=DueDate}" Header="Due Date" Width="90" />
<DataGridTextColumn x:Name="statusColumn" Binding="{Binding Path=Status}" Header="Status" Width="70" />
</DataGrid.Columns>
</DataGrid>
<CheckBox Content="Show Active Jobs" Name="actJobsCheckBox" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="3" HorizontalAlignment="Center" VerticalAlignment="Center" Checked="AddFiltering" Unchecked="RemoveFiltering"/>
<CheckBox Content="Show Completed Jobs" Name="compJobsCheckBox" Grid.Column="3" Grid.ColumnSpan="3" Grid.Row="3" HorizontalAlignment="Center" VerticalAlignment="Center" Checked="AddFiltering" Unchecked="RemoveFiltering"/>
</Grid>
在我后面的代码中，我有以下内容：
public partial class AdminView : Window
{
ObservableCollection <JobItem> JobItemList = new ObservableCollection<JobItem>();
CollectionViewSource jobItemViewSource = new CollectionViewSource();
ICollectionView view;
MainWindow parent;
Employee currEmployee;
GroupFilter filterList = new GroupFilter();
public AdminView(MainWindow parent, Employee currEmployee)
{
this.parent = parent;
this.currEmployee = currEmployee;
InitializeComponent();
jobItemDataGrid.DataContext = JobItemList;
jobItemViewSource = (CollectionViewSource)(this.Resources[jobItemViewSource]);
view = CollectionViewSource.GetDefaultView(jobItemDataGrid);
}
private void AddFiltering(object sender, RoutedEventArgs args)
{
CheckBox check = sender as CheckBox;
Predicate<object> active = new Predicate<object>(ContainsActive);
Predicate<object> completed = new Predicate<object>(ContainsComp);
switch (check.Name)
{
case "actJobsCheckBox":
filterList.AddFilter(active);
if( view != null)
view.Filter = filterList.Filter;
break;
case "compJobsCheckBox":
filterList.AddFilter(completed);
if (view != null)
view.Filter = filterList.Filter;
break;
}
}
private void RemoveFiltering(object sender, RoutedEventArgs args)
{
CheckBox check = sender as CheckBox;
Predicate<object> active = new Predicate<object>(ContainsActive);
Predicate<object> completed = new Predicate<object>(ContainsComp);
switch (check.Name)
{
case "actJobsCheckBox":
filterList.RemoveFilter(active);
break;
case "compJobsCheckBox":
filterList.RemoveFilter(completed);
break;
}
}
public bool ContainsActive(object de)
{
JobItem item = de as JobItem;
return (item.Status != "Completed");
}
public bool ContainsComp(object de)
{
JobItem item = de as JobItem;
return (item.Status == "Completed");
}