UWP：编写巨大的日志文件非常慢

Question

I try to write a log file and it's huge amount of data. I use AppendTextAsync every time I want to add data to create the structure I want and it's very slow. Is there any way to improve it?

        await FileIO.AppendTextAsync(file, "All event log messages   \r\n");

Answer 1

AppendTextAsync will open the file, seek to the end, write to the file, close the file. This involves a lot of work for the OS, especially for writing a single line of text.

Open the file once, append all the text required, then close it.

Answer 2

As somebody else mentioned AppendTextAsync open and write and close the file every time so I changed it to this:

            var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
            using (var outputStream = stream.GetOutputStreamAt(0))
            {

                using (var dataWriter = new Windows.Storage.Streams.DataWriter(outputStream))
                {


                    dataWriter.WriteString("All event log messages   \r\n");
                    await dataWriter.StoreAsync();
                    await outputStream.FlushAsync();

                }
            }
            stream.Dispose();