C#同步和异步调用方法实例

namespace consoletest
{
    class program
    {
        static void main(string[] args)
        {
            console.writeline("********同步调用开始**********");
            int result = add(1,2);
            console.writeline("同步调用完毕，执行结果为:" + result);

            console.writeline("********异步调用开始**********");
            synadd(1, 2, (r) => {
                console.writeline("异步调用完毕，执行结果为:" + r);
            });
            console.writeline("-------完毕！----------");
            console.readline();
        }

        /// <summary>
        /// 同步方法
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        static int add(int a, int b)
        {
            thread.sleep(5000);
            return a + b;
        }

        /// <summary>
        /// 异步调用
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <param name="callback">委托对象</param>
        static void synadd(int a, int b, action<int> callback)
        {
            func<int> func = () =>
            {
                thread.sleep(5000);
                return a+b;
            };//声明异步方法实现方式
            func.begininvoke((ar) =>
            {
                var result = func.endinvoke(ar);//调用完毕执行的结果
                callback.invoke(result);//委托执行，回传结果值
            }, null);
        }
    }
}