■ Task 클래스의 Delay 정적 메소드를 사용해 타임아웃시 취소 가능한 태스크를 생성하는 방법을 보여준다.
▶ Program.cs
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using System; using System.Net.Http; using System.Threading; using System.Threading.Tasks; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { HttpClient client = new HttpClient(); string html = DownloadStringAsync(client, "https://www.daum.net").GetAwaiter().GetResult(); Console.WriteLine(html); } #endregion #region 문자열 다운로드하기 (비동기) - DownloadStringAsync(httpClient, uri) /// <summary> /// 문자열 다운로드하기 (비동기) /// </summary> /// <param name="httpClient">HTTP 클라이언트</param> /// <param name="uri">URI</param> /// <returns>문자열 태스크</returns> private static async Task<string> DownloadStringAsync(HttpClient httpClient, string uri) { using CancellationTokenSource cancellationTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(3)); Task<string> downloadTask = httpClient.GetStringAsync(uri); Task timeoutTask = Task.Delay(Timeout.InfiniteTimeSpan, cancellationTokenSource.Token); Task completedTask = await Task.WhenAny(downloadTask, timeoutTask); if(completedTask == timeoutTask) { return null; } return await downloadTask; } #endregion } } |
