C#多线程开发之----委托异步DelegateM有返回值

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 private int DoingSomethin6(string name)
        {
            for (int i = 0; i < 20; i++)
            {
                Thread.Sleep(100);
            }
            Console.WriteLine($"{name}-->{Thread.CurrentThread.ManagedThreadId}");
            return DateTime.Now.Day;
        }

        delegate int DelegateM(string a);

private void button8_Click(object sender, EventArgs e)
        {
            //delegate用法
            DelegateM delegateM = DoingSomethin6;//简写
            Console.WriteLine($"同步调用-->:{delegateM("button8_Click")}");

            IAsyncResult asyncResult = null; //返回内容
            //线程结束后回调函数
            AsyncCallback callbak = ia =>
            {
                //Console.WriteLine(object.ReferenceEquals(asyncResult, ia));
                Console.WriteLine(ia.AsyncState);//参数内容
                Console.WriteLine($"运行这里已经完成-->{Thread.CurrentThread.ManagedThreadId}");
            };

            //异步
            asyncResult = delegateM.BeginInvoke("button8_Click", null, "hello");
            Console.WriteLine($"异步带有返回值内容-->{delegateM.EndInvoke(asyncResult)}");
            Console.WriteLine($"线程结束-->{Thread.CurrentThread.ManagedThreadId}");
        }