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我对 WPF 还是很陌生，并试图掌握 MVVM 模式。我有包含 2 个日期选择器的 mainWindow.xaml 文件

        <DatePicker Padding="5,5,5,5"
                    Text="{Binding Path=dateOptObj.openDate, Mode=TwoWay}"/>
        <TextBlock  Padding="5,5,5,5" Text=" to "/>
        <DatePicker Padding="5,5,5,5" 
                    Text="{Binding Path=dateOptObj.closeDate, Mode=TwoWay}"/>

当程序加载我的日期 obj 具有基于这些日期选择器的有效数据并加载与这两个日期匹配的网格时：

dateOptObj = new mdDateOptions();

现在这是加载该对象的实际类。

private ICollectionView _datOpts;
    public ObservableCollection<string> dates { get; private set; }
    public ICollectionView datesView
    {
        get
        {
            return _datOpts;
        }
    }
    public mdDateOptions()
    { 

        dates = new ObservableCollection<string>();
        dates.Add("Rolling Year");
        dates.Add("Year to Date");
        dates.Add("Last Year");

        _datOpts = CollectionViewSource.GetDefaultView(dates);
        _datOpts.CurrentChanged += new EventHandler(OnCurrentChanged);
    }

    public void OnCurrentChanged(object sender, EventArgs e)
    {
        string currSel = (string)_datOpts.CurrentItem;
        DateTime p_date = new DateTime();
        p_date = DateTime.Today;

        switch (currSel)
        {
            case "Rolling Year":
                openDate = DateTime.Today.AddYears(-1);
                closeDate = DateTime.Today;

                openDatePrevious = DateTime.Today.AddYears(-2);
                closeDatePrevious = DateTime.Today.AddYears(-1);

                break;
            case "Year to Date":
                openDate = new DateTime(DateTime.Today.Year, 1, 1);
                closeDate = DateTime.Today;

                openDatePrevious = new DateTime(DateTime.Today.AddYears(-1).Year, 1, 1);
                closeDatePrevious = DateTime.Today.AddYears(-1);
                break;
            case "Last Year":
                openDate = new DateTime(DateTime.Today.AddYears(-1).Year, 1, 1);
                closeDate = new DateTime(DateTime.Today.AddYears(-1).Year, 12, 31);

                openDatePrevious = new DateTime(DateTime.Today.AddYears(-2).Year, 1, 1);
                closeDatePrevious = new DateTime(DateTime.Today.AddYears(-2).Year, 12, 31);
                break;
            default:
                MessageBox.Show("Unknown Date Option");
                break;
        }
    }

我的问题是我的 mainWindow.xaml 上有一个 userControl，它有一个按钮列表，可以在 mainWindow.xaml 上加载一个网格。当您点击 userControl 中的按钮时，我希望它根据日期选择器过滤掉网格中的某些数据，但是当我的中继命令在视图模型中触发时，上面的 dateOptObj 为空。谁能指出我正确的方向？下面是我如何加载 UserControl。

<vm:StatPanel DockPanel.Dock="Right" Loaded="StatPanel_Loaded" />

下面是我的 UserControl 面板，其中包含我想在 MainWindow.xaml 中的主网格上过滤的按钮网格。

<DataGridTemplateColumn Header="Security">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Button Name="Security" Content="{Binding Path=totalSecurities}" Command="{Binding Source={StaticResource viewModel}, Path=filterGridCommand}">
                                    <Button.CommandParameter>
                                        <MultiBinding Converter="{StaticResource PassThroughConverter}">
                                            <Binding Path="sector"/>
                                            <Binding ElementName="Security" Path="Name"/>
                                        </MultiBinding>
                                    </Button.CommandParameter>

                                </Button>
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>

这是我的 filterGridCommand

public RelayCommand filterGridCommand
    {
        get
        {
            if (_filterGridCommand == null)
            {
                _filterGridCommand = new RelayCommand(filterGrid);
            }

            return _filterGridCommand;
        }
    }
    private void filterGrid(object param)
    {
        var values = (object[])param;
        string sector = (string)values[0];
        string type = (string)values[1];


        EmployeeObj empObj = (EmployeeObj)_repsView.CurrentItem;
        dash.reFillLogNewAccounts(dateOptObj.openDate, dateOptObj.closeDate, empObj.RRNumber,sector,type);
    }
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