Несколько фильтров, не работающих в DataGrid WPF

Question

Моя привязка данных отлично работает в моем DataGrid, но когда я пытаюсь получить коллекцию из моего CollectionViewSource, она равна null, а мой фильтр в DataGrid не работает. Вот код:

<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> 

В моем коде позади, у меня есть следующие:

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"); 
    } 

Answer 1

я на самом деле понял, мой собственный ответ, мне просто нужно, чтобы освежить свою точку зрения, и она работает.