private async void AddFileButton_Click(object sender, RoutedEventArgs e)
{
StorageFile file = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(@"CachedFile.txt", CreationCollisionOption.ReplaceExisting);
await Windows.Storage.FileIO.WriteTextAsync(file, @"Cached file created...");
CachedFileUpdater.SetUpdateInformation(file, "CachedFile", ReadActivationMode.BeforeAccess, WriteActivationMode.NotNeeded, CachedFileOptions.RequireUpdateOnAccess);
bool inBasket;
switch (fileOpenPickerUI.AddFile(id, file))
{
case AddFileResult.Added:
case AddFileResult.AlreadyAdded:
inBasket = true;
OutputTextBlock.Text = Status.FileAdded;
break;
default:
inBasket = false;
OutputTextBlock.Text = Status.FileAddFailed;
break;
}
UpdateButtonState(inBasket);
}
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();
}
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 RenameButton_Click(object sender, RoutedEventArgs e)
{
FileUpdateRequest fileUpdateRequest = CachedFileUpdaterPage.Current.fileUpdateRequest;
FileUpdateRequestDeferral fileUpdateRequestDeferral = CachedFileUpdaterPage.Current.fileUpdateRequestDeferral;
StorageFile file = await fileUpdateRequest.File.CopyAsync(ApplicationData.Current.LocalFolder, fileUpdateRequest.File.Name, NameCollisionOption.GenerateUniqueName);
CachedFileUpdater.SetUpdateInformation(file, "CachedFile", ReadActivationMode.NotNeeded, WriteActivationMode.AfterWrite, CachedFileOptions.RequireUpdateOnAccess);
fileUpdateRequest.UpdateLocalFile(file);
this.OutputFileAsync(file);
fileUpdateRequest.Status = FileUpdateStatus.CompleteAndRenamed;
fileUpdateRequestDeferral.Complete();
UpdateUI(CachedFileUpdaterPage.Current.cachedFileUpdaterUI.UIStatus);
}
// 本 CachedFile 用于从 Remote 更新（由 app 更新 CachedFile）
private async void btnPickCachedFileRemote_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(@"webabcdCachedFileUpdaterRemote.txt", CreationCollisionOption.ReplaceExisting);
string textContent = "I am webabcd";
await FileIO.WriteTextAsync(file, textContent);
/*
* 设置 CachedFile，即将文件关联到 CachedFileUpdater
* SetUpdateInformation(IStorageFile file, string contentId, ReadActivationMode readMode, WriteActivationMode writeMode, CachedFileOptions options);
* file - 与 CachedFileUpdater 关联的文件
* contentId - 与 CachedFileUpdater 关联的文件标识
*/
CachedFileUpdater.SetUpdateInformation(file, "cachedFileRemote", ReadActivationMode.NotNeeded, WriteActivationMode.AfterWrite, CachedFileOptions.RequireUpdateOnAccess);
lblMsg.Text = "选择的文件: " + file.Name;
AddFileResult result = _fileOpenPickerUI.AddFile("myFile", file);
}
