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我不知道要说什么异常，我在论坛中搜索但仍然无法弄清楚，所以在这里发布我的问题。

这是我的xml 

 <StackPanel Orientation="Vertical"
        Grid.Row="0"
        Grid.Column="3"
        Grid.RowSpan="3"
        Style="{StaticResource ImageButtonContainer}">
    <Button Name="btnSubjectSearch"
            MinWidth="25"
            Width="25"
            Height="25"
            HorizontalAlignment="Right"
            Click="btnSubjectSearch_Click"
            Visibility="{Binding SelectedProgram.IsProgramSelected, Mode=OneWay, Converter={StaticResource visibilityConverter}}"
            Style="{StaticResource ImageButton}">
                <Image Source="../Resources/blue_plus.png" HorizontalAlignment="Stretch" />
    </Button>
    <Button Name="btnRemoveSubject"
            MinWidth="25"
            Width="25"
            Height="25"
            HorizontalAlignment="Right"
            Style="{StaticResource ImageButton}"
            Click="btnRemoveSubject_Click">
                <Image Source="../Resources/blue_minus.png" HorizontalAlignment="Stretch" />
    </Button>
</StackPanel>

这是我背后的代码

 private void btnSubjectSearch_Click(object sender, RoutedEventArgs e)
    {
        if (sender is Button)
        {
            **Application.Current.MainWindow.IsEnabled = false; //It throwing exception here**
            (Application.Current.MainWindow as dynamic).ProcessWindowCloseability(false);
            ShowPopup((Button)sender);
            Model.SubjectSearchCommand.Execute(null);
        }

btn主题搜索

当我单击“+”按钮时，它会弹出窗口并显示主题列表，但它会在“Application.Current.MainWindow.IsEnabled = false;”处引发异常。

请有人指导我正确的道路，并在此先感谢

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