C# 中 SetTimeout 方案

近期項目中需在用戶點擊按鈕后，延時執行代碼邏輯，避免頻繁操作。網上沒找到有關 C# SetTimeout 官方API ， 於是通過異步線程，動手實現一個。方案如下，如果同一個DelayedProcess 對象連續調用 SetTimeout 多次 ,默認取消前一次調用。

 public class DelayedProcess<Req,Rsp>
    {
        public delegate void ExcuteMethod(Result rsp);
        CancellationTokenSource tokenSource;

        public class Result {

            public Req request {
                get;
                set;
            }

            public Rsp response {
                get;
                set;
            }

            /// <summary>
            /// 拋出異常信息
            /// </summary>
            public Exception ex;

            /// <summary>
            /// 是否延時執行成功
            /// </summary>
            public bool IsSuccess {
                get;
                set;
            }
        }

        async void TaskDelay(int timeout, CancellationToken token, ExcuteMethod method,  Result rsp)
        {
            try
            {
                await Task.Delay(timeout, token);
                rsp.IsSuccess = true;
                rsp.ex = null;
            }
            catch (Exception ex)
            {
                rsp.ex = ex;
                rsp.IsSuccess = false;
            }
            finally {
                method(rsp);
            }
        }

        public void SetTimeout(int timeout, ExcuteMethod method, Result rsp)
        {
            Cancel();
            tokenSource = new CancellationTokenSource();
            TaskDelay(timeout, tokenSource.Token, method , rsp);
        }

        public void Cancel()
        {
            if (tokenSource != null && !tokenSource.IsCancellationRequested)
            {
                tokenSource.Cancel();
            }
        }
    }

　　

調用示例:

  DelayedProcess<string, string> dp = new DelayedProcess<string, string>();

        private void button1_Click(object sender, EventArgs e)
        {
            Console.WriteLine("{0}:{1}", DateTime.Now, "開始請求");
            dp.SetTimeout(2000, (arg) => {
                if (arg.IsSuccess)
                {
                    Console.WriteLine("{0}:延時執行{1}", DateTime.Now, arg.request);
                }
                else {
                    Console.WriteLine("{0}:延時失敗,{1}", DateTime.Now, arg.ex.Message);
                }
            }, new DelayedProcess<string, string>.Result() { request = "1111" });
        }