mvvm

问题 I have a reminder notification that is sent every few days. The sending of that notification is triggered with a repeating AlarmManager . The notification itself is built in the onReceive of my BroadcastReceiver (as described here). So when onReceive is triggered, the app is not even open/running. Now at that point I want to access my (local) SQLite database and get the correct content to build the notification with, but how would I get a ViewModelProvider (xxx in the code) in this place to

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 days ago . Improve this question Background While looking at Josh Smith's article about CommandGroup , I noticed that there are a number of comments on the Internet about how to implement ICommand.CanExecuteChanged . A similar question was posted here on StackOverflow, but I don't feel like

问题 I have a reminder notification that is sent every few days. The sending of that notification is triggered with a repeating AlarmManager . The notification itself is built in the onReceive of my BroadcastReceiver (as described here). So when onReceive is triggered, the app is not even open/running. Now at that point I want to access my (local) SQLite database and get the correct content to build the notification with, but how would I get a ViewModelProvider (xxx in the code) in this place to

问题 I have a reminder notification that is sent every few days. The sending of that notification is triggered with a repeating AlarmManager . The notification itself is built in the onReceive of my BroadcastReceiver (as described here). So when onReceive is triggered, the app is not even open/running. Now at that point I want to access my (local) SQLite database and get the correct content to build the notification with, but how would I get a ViewModelProvider (xxx in the code) in this place to

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 days ago . Improve this question Background While looking at Josh Smith's article about CommandGroup , I noticed that there are a number of comments on the Internet about how to implement ICommand.CanExecuteChanged . A similar question was posted here on StackOverflow, but I don't feel like

问题 Reading Josh Smiths article about MVVM his view model CustomerViewModel implements INotifyPropertyChanged but not the underlying Customer class. I can only see one (feasible) way to make change notification work in that case - only make changes to the CustomerViewModel and not the Customer . In that case, should the backend logic of my program also simply work against ViewModels? That seems pretty weird, they being View Models after all. Anyone that can clarify this a bit? Thanks!

问题 I have the following code: <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>

问题 This seems like it would be an easy solution, but I'm wasting too much time trying to figure this out. Perhaps I am designing my application incorrectly (which might be the case), so please help me out if you have a better solution. I'm designing an enterprise level WPF application that looks a lot like Outlook with a Ribbon instead of a toolbar. I have a lot of different modules that are loaded into a frame when the user clicks on a RibbonButton . Keep in mind that his ribbon is shared

问题 I have multiple expanders, and I was looking for a way to collapse all others the expanders when one of them is expanded. And I found this solution here XAML: <StackPanel Name="StackPanel1"> <StackPanel.Resources> <local:ExpanderToBooleanConverter x:Key="ExpanderToBooleanConverter" /> </StackPanel.Resources> <Expander Header="Expander 1" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=1}"> <TextBlock>Expander 1<

问题 I have multiple expanders, and I was looking for a way to collapse all others the expanders when one of them is expanded. And I found this solution here XAML: <StackPanel Name="StackPanel1"> <StackPanel.Resources> <local:ExpanderToBooleanConverter x:Key="ExpanderToBooleanConverter" /> </StackPanel.Resources> <Expander Header="Expander 1" IsExpanded="{Binding SelectedExpander, Mode=TwoWay, Converter={StaticResource ExpanderToBooleanConverter}, ConverterParameter=1}"> <TextBlock>Expander 1<