private async void OnTargetFileRequested(FileSavePickerUI sender, TargetFileRequestedEventArgs e)
{
// This scenario demonstrates how the app can go about handling the TargetFileRequested event on the UI thread, from
// which the app can manipulate the UI, show error dialogs, etc.
// Requesting a deferral allows the app to return from this event handler and complete the request at a later time.
// In this case, the deferral is required as the app intends on handling the TargetFileRequested event on the UI thread.
// Note that the deferral can be requested more than once but calling Complete on the deferral a single time will complete
// original TargetFileRequested event.
var deferral = e.Request.GetDeferral();
await dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
// This method will be called on the app's UI thread, which allows for actions like manipulating
// the UI or showing error dialogs
// Display a dialog indicating to the user that a corrective action needs to occur
var errorDialog = new Windows.UI.Popups.MessageDialog("If the app needs the user to correct a problem before the app can save the file, the app can use a message like this to tell the user about the problem and how to correct it.");
await errorDialog.ShowAsync();
// Set the targetFile property to null and complete the deferral to indicate failure once the user has closed the
// dialog. This will allow the user to take any neccessary corrective action and click the Save button once again.
e.Request.TargetFile = null;
deferral.Complete();
});
}
private async void OnTargetFileRequested(FileSavePickerUI sender, TargetFileRequestedEventArgs e)
{
// This scenario demonstrates how to handle the TargetFileRequested event on the background thread on which it was raised
// Requesting a deferral allows the app to call another asynchronous method and complete the request at a later time
var deferral = e.Request.GetDeferral();
e.Request.TargetFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(sender.FileName, CreationCollisionOption.GenerateUniqueName);
// Complete the deferral to let the Picker know the request is finished
deferral.Complete();
}
private async void OnTargetFileRequested(FileSavePickerUI sender, TargetFileRequestedEventArgs e)
{
// This scenario demonstrates how to handle the TargetFileRequested event on the background thread on which it was raised
// Requesting a deferral allows the app to call another asynchronous method and complete the request at a later time
var deferral = e.Request.GetDeferral();
StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(sender.FileName, CreationCollisionOption.ReplaceExisting);
CachedFileUpdater.SetUpdateInformation(file, "CachedFile", ReadActivationMode.NotNeeded, WriteActivationMode.AfterWrite, CachedFileOptions.RequireUpdateOnAccess);
e.Request.TargetFile = file;
// Complete the deferral to let the Picker know the request is finished
deferral.Complete();
}
private async void OnTargetFileRequested(FileSavePickerUI sender, TargetFileRequestedEventArgs e)
{
// This scenario demonstrates how to handle the TargetFileRequested event on the background thread on which it was raised
// Requesting a deferral allows the app to call another asynchronous method and complete the request at a later time
var deferral = e.Request.GetDeferral();
StorageFile file;
// If the checkbox is checked then the requested file name will be ConflictingFile.txt instead of what was sent to us in sender.name.
// If background task sees that ConflictingFile is in the name of the file it sets the returned status to FileUpdateStatus.UserInputNeeded.
// This will cause a prompt for the user to open the app to fix the conflict.
if (simulateUpdateConflict)
{
file = await ApplicationData.Current.LocalFolder.CreateFileAsync("ConflictingFile.txt", CreationCollisionOption.ReplaceExisting);
}
else
{
file = await ApplicationData.Current.LocalFolder.CreateFileAsync(sender.FileName, CreationCollisionOption.ReplaceExisting);
}
CachedFileUpdater.SetUpdateInformation(file, "CachedFile", ReadActivationMode.NotNeeded, WriteActivationMode.AfterWrite, CachedFileOptions.RequireUpdateOnAccess);
e.Request.TargetFile = file;
// Complete the deferral to let the Picker know the request is finished
deferral.Complete();
}