Stackoverflow 珠玑——封装重试指定次数的功能

  　　　　public static T Retry<T, TException>(int timesToRetry, Func<int, T> thingToTry) where TException : Exception {
            // Start at 1 instead of 0 to allow for final attempt
            int i;
            for (i = 1; i < timesToRetry; i++) {
                try {
                    return thingToTry(i);
                }
                catch (TException) {
                    // Maybe: Trace.WriteLine("Failed attempt...");
                }
            }

            return thingToTry(i); // Final attempt, let exception bubble up
        }

　　　　 //这里我增加了个异步版本 
        public static async Task<T> RetryAsync<T, TException>(int timesToRetry, Func<int, Task<T>> thingToTry) where TException : Exception {
            // Start at 1 instead of 0 to allow for final attempt
            int i;
            for (i = 1; i < timesToRetry; i++) {
                try {
                    return await thingToTry(i);
                }
                catch (TException) {
                    // Maybe: Trace.WriteLine("Failed attempt...");
                }
            }

            return await thingToTry(i); // Final attempt, let exception bubble up
        }

using static AStaticClass;

class A {

    void B() {
        //重试 3 次
        var result = Retry<int, Exception>(3, nTimes => {
            //这里做需要重试的事情
            Console.WriteLine($"第 {nTimes} 次尝试");
            return 99999;
        });
    }
}