Write to trace file in sequential order

Question

I have this piece of code:

var traceFile = Windows.Storage.ApplicationData.current.localFolder.createFileAsync("trace.txt", Windows.Storage.CreationCollisionOption.openIfExists);
var lastWriter = traceFile;
function trace(data) {
  lastWriter.then(function (file) {
    lastWriter = Windows.Storage.FileIO.appendTextAsync(file, data).then(function () {
      return file;
    });
  });
}

and I want to call the trace method from everywhere in the program. It seems that it does not write all the date I throw at it.

Where is the glitch?

Answer 1

Probably call the function everywhere may cause the file access conflict?

--James

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Answer 2

No, there is no exception thrown. And when stepping through the code with the debugger all entries are written. So it seems more like a timing issue. But I fail to see whats wrong with my promise chaining.