void CachedFileUpdaterUI_FileUpdateRequested(CachedFileUpdaterUI sender, FileUpdateRequestedEventArgs args)
{
fileUpdateRequest = args.Request;
fileUpdateRequestDeferral = fileUpdateRequest.GetDeferral();
switch (cachedFileUpdaterUI.UIStatus)
{
case UIStatus.Hidden:
if (fileUpdateRequest.File.Name.Contains("ConflictingFile"))
{
fileUpdateRequest.Status = FileUpdateStatus.UserInputNeeded;
}
else
{
fileUpdateRequest.Status = FileUpdateStatus.Complete;
}
fileUpdateRequestDeferral.Complete();
break;
case UIStatus.Visible:
break;
case UIStatus.Unavailable:
fileUpdateRequest.Status = FileUpdateStatus.Failed;
fileUpdateRequestDeferral.Complete();
break;
}
}
private async void btnUpdate_Click(object sender, RoutedEventArgs e)
{
FileUpdateRequestDeferral fileUpdateRequestDeferral = _fileUpdateRequest.GetDeferral();
// 由 CachedFileUpdater 更新 CachedFile，然后返回给 app 一个 FileUpdateStatus 状态
await FileIO.AppendTextAsync(_fileUpdateRequest.File, Environment.NewLine + "由 CachedFileUpdater 更新：" + DateTime.Now.ToString());
string fileContent = await FileIO.ReadTextAsync(_fileUpdateRequest.File);
lblMsg.Text = "文件名: " + _fileUpdateRequest.File.Name;
lblMsg.Text += Environment.NewLine;
lblMsg.Text += "文件内容: " + fileContent;
_fileUpdateRequest.Status = FileUpdateStatus.Complete;
fileUpdateRequestDeferral.Complete();
btnUpdate.IsEnabled = false;
}
async void _cachedFileUpdaterUI_FileUpdateRequested(CachedFileUpdaterUI sender, FileUpdateRequestedEventArgs args)
{
_fileUpdateRequest = args.Request;
FileUpdateRequestDeferral fileUpdateRequestDeferral = _fileUpdateRequest.GetDeferral();
if (_cachedFileUpdaterUI.UpdateTarget == CachedFileTarget.Local) // 由 CachedFileUpdater 更新 CachedFile（CachedFileTarget.Local 方式）
{
// 开始激活 CachedFileUpdater 时，是 UIStatus.Hidden 状态的
if (_cachedFileUpdaterUI.UIStatus == UIStatus.Hidden)
{
// 下面针对两种方式分别写示例
// 方式一：直接更新文件，并设置为 FileUpdateStatus.Complete 状态，最后完成
if (DateTime.Now.Second % 2 == 0)
{
await FileIO.AppendTextAsync(_fileUpdateRequest.File, Environment.NewLine + "由 CachedFileUpdater 更新：" + DateTime.Now.ToString());
_fileUpdateRequest.Status = FileUpdateStatus.Complete;
fileUpdateRequestDeferral.Complete();
}
// 方式二：设置为 FileUpdateStatus.UserInputNeeded 状态，并完成，之后会再次触发这个事件，并且变为 UIStatus.Visible 状态，弹出本页界面，
// 这样的话可以在用户做一些操作之后再更新文件（参见下面的 btnUpdate_Click 部分）
else
{
_fileUpdateRequest.Status = FileUpdateStatus.UserInputNeeded;
fileUpdateRequestDeferral.Complete();
}
}
}
else if (_cachedFileUpdaterUI.UpdateTarget == CachedFileTarget.Remote) // 由 app 更新 CachedFile（CachedFileTarget.Remote 方式）
{
// 这里可以拿到 app 更新后的文件的结果
string textContent = await FileIO.ReadTextAsync(_fileUpdateRequest.File);
// 但是这里不能修改这个文件，否则会报错
// await FileIO.AppendTextAsync(_fileUpdateRequest.File, Environment.NewLine + "由 CachedFileUpdater 更新：" + DateTime.Now.ToString());
// CachedFileUpdater 返回给 app 一个 FileUpdateStatus 状态
_fileUpdateRequest.Status = FileUpdateStatus.Complete;
fileUpdateRequestDeferral.Complete();
}
}
void CachedFileUpdaterUI_FileUpdateRequested(CachedFileUpdaterUI sender, FileUpdateRequestedEventArgs args)
{
fileUpdateRequest = args.Request;
fileUpdateRequestDeferral = fileUpdateRequest.GetDeferral();
switch (cachedFileUpdaterUI.UIStatus)
{
case UIStatus.Hidden:
fileUpdateRequest.Status = FileUpdateStatus.UserInputNeeded;
fileUpdateRequestDeferral.Complete();
break;
case UIStatus.Visible:
break;
case UIStatus.Unavailable:
fileUpdateRequest.Status = FileUpdateStatus.Failed;
fileUpdateRequestDeferral.Complete();
break;
}
}
private void OnFileUpdateRequested(CachedFileUpdaterUI sender, FileUpdateRequestedEventArgs args)
{
switch (sender.UIStatus)
{
case UIStatus.Hidden:
fileUpdateRequest = args.Request;
fileUpdateRequestDeferral = fileUpdateRequest.GetDeferral();
// process cached file
fileUpdateRequestDeferral.Complete();
break;
case UIStatus.Visible:
// use the class fields
fileUpdateRequestDeferral.Complete();
break;
case UIStatus.Unavailable:
fileUpdateRequest.Status = FileUpdateStatus.Failed;
fileUpdateRequestDeferral.Complete();
break;
}
}