[C#/General] Mutiple File Access (async/await)

> Main에서 비동기 사용 (Main에서 await 사용)

비동기 파일생성 (Async File Access)

using System.Text;

public class Example
{
    public async static Task Main()
    {
        ProcessMulitpleWritesAsync().GetAwaiter().GetResult();
    }

    public async static Task ProcessMulitpleWritesAsync()
    {
        IList<FileStream> sourceStreams = new List<FileStream>();

        try
        {
            // Testfolder 생성
            string folder = Directory.CreateDirectory("Testfolder").Name;
            IList<Task> writeTaskList = new List<Task>();

            // 10개의 파일을 Async로 생성.
            for (int index = 1; index <= 10; ++index)
            {
                string fileName = $"codekiller-{index:00}.txt";
                string filePath = $"{folder}/{fileName}";

                string text = $"In file {index}{Environment.NewLine}";
                byte[] encodedText = Encoding.Unicode.GetBytes(text);

                var sourceStream =
                    new FileStream(filePath,FileMode.Create, FileAccess.Write, FileShare.None,bufferSize: 4096, useAsync: true);

                Task writeTask = sourceStream.WriteAsync(encodedText, 0, encodedText.Length);
                sourceStreams.Add(sourceStream);
                writeTaskList.Add(writeTask);
            }

            // Task 완료 대기.
            await Task.WhenAll(writeTaskList);
        }
        finally
        {
            foreach (FileStream sourceStream in sourceStreams)
            {
                sourceStream.Close();
            }
        }
    }
}