Step by step manual for PickSingleFileAndContinue?

Ah sorry About that:

then you have to get to files in your project ContinuationManager(look at buttom of this page https://msdn.microsoft.com/en-us/library/windows/apps/xaml/dn631755.aspx) and suspensionManager(create new WP project whis is not blank type)

then inherit this interface IFileOpenPickerContinuable in the page u are using file picker,

Add property public ContinuationManager ContinuationManager { get; private set; } in app.xaxml.cs

instanciate continuationManager = new ContinuationManager(); inside onactivated method

write this code below instantiation:

 Frame rootFrame = CreateRootFrame();
await RestoreStatusAsync(e.PreviousExecutionState);

if(rootFrame.Content == null)
{
rootFrame.Navigate(typeof(MainPage));
}

var continuationEventArgs = e as IContinuationActivatedEventArgs;
if (continuationEventArgs != null)
{
Frame scenarioFrame = MainPage.Current.FindName("pageName where fileopenpickeris used") as Frame;
if (scenarioFrame != null)
{
// Call ContinuationManager to handle continuation activation
continuationManager.Continue(continuationEventArgs, scenarioFrame);
}
}

Window.Current.Activate();

 

now add this method inside the page where filepicker is used:

public void ContinueFileOpenPicker(FileOpenPickerContinuationEventArgs args)
{
           StorageFile file= args.Files[0];
           
} 

//initialize fileopenPicker 

FileOpenPicker openPicker = new FileOpenPicker();

//viewmode of picker

openPicker.ViewMode = PickerViewMode.Thumbnail;

//picker starts in picture library 

openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;

// add filter type 

openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");

// Launch file open picker and caller app is suspended
// and may be terminated if required
openPicker.PickSingleFileAndContinue();

 

 

to save the file u can use

StorageFile file=  openPicker.PickSingleFileAndContinue();

u might have to check weather fie is null or not to make sure user did select file or else app will crash