title: UWP FileSavePicker Contract File Processing
body: <p>In my App i'm using a a FileSavePicker Contract (Provider). So other Apps could save files to my App. I implemented it, as it is shown on MSDN. The Problem now is, that i have to process a "saved" file, but how do i know, when the saving is completed? Here is my handler</p>
  
  <pre><code>private async void FileSavePickerUI_TargetFileRequested(FileSavePickerUI sender, TargetFileRequestedEventArgs args)
  {
          var deferral = args.Request.GetDeferral();
  
          string saveFileName = sender.FileName;
  
          StorageFolder fileSavePickerContractTempFolder = await ApplicationData.Current.LocalCacheFolder.CreateFolderAsync("FileSavePickerContract", CreationCollisionOption.OpenIfExists);
  
          StorageFile fileSavePickerContractTempFile = await fileSavePickerContractTempFolder.CreateFileAsync(saveFileName, CreationCollisionOption.ReplaceExisting);
  
          args.Request.TargetFile = fileSavePickerContractTempFile;
  
          deferral.Complete();
      }
  </code></pre>
  
  <p>Target of my app is the anniversary update (1607). After deferral.Complete() i Need to to more work with that file for integrating in my App. Can someone Point me in the right direction?</p>