C#中调用BeginInvokeInvoke时如何获取返回值

如何在C#中调用BeginInvoke/Invoke时获取返回值

csharp
using System;
using System.Threading;
namespace GetReturnValueExample
{
    public delegate int CalculateDelegate(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            CalculateDelegate calculateDelegate = new CalculateDelegate(CalculateSum);
            // 异步执行计算
            IAsyncResult asyncResult = calculateDelegate.BeginInvoke(10, 20, null, null);
            // 此处可以执行其他操作
            // 获取异步操作的返回值
            int result = calculateDelegate.EndInvoke(asyncResult);
            Console.WriteLine("计算结果为：" + result);
            Console.ReadLine();
        }
        static int CalculateSum(int a, int b)
        {
            Thread.Sleep(2000); // 模拟耗时操作
            return a + b;
        }
    }
}

csharp
using System;
namespace GetReturnValueExample
{
    public delegate int CalculateDelegate(int a, int b);
    class Program
    {
        static void Main(string[] args)
        {
            CalculateDelegate calculateDelegate = new CalculateDelegate(CalculateSum);
            // 同步执行计算
            int result = calculateDelegate.Invoke(10, 20);
            Console.WriteLine("计算结果为：" + result);
            Console.ReadLine();
        }
        static int CalculateSum(int a, int b)
        {
            return a + b;
        }
    }
}