異步

時間 2019-12-14

標籤異步简体版

原文原文鏈接

http://www.cnblogs.com/dudu/p/aspnet-webform-async.htmlcss

http://mrbool.com/how-to-create-asynchronous-device-page-in-asp-net-4-5/26022html

異步編程中的最佳作法

https://msdn.microsoft.com/magazine/jj991977web

ASP.NET 上的 Async/Await 簡介編程

https://msdn.microsoft.com/magazine/dn802603.aspx異步

單元測試異步代碼

https://msdn.microsoft.com/magazine/dn818493.aspxasync

1. Page 的屬性【Async】設定爲【true】異步編程

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ExampleAsync.Default" Async="true" %>

2.【PageAsyncTask】定義異步任務，使用【RegisterAsyncTask】向該頁註冊任務單元測試

3.【GetMyPosts】方法標記爲【async】，且返回一個【Task】。測試

4. 使用異步方法時，使用【await】關鍵字。spa

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using System.Web.UI;

namespace ExampleAsync
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Debug.WriteLine("Start");
            RegisterAsyncTask(new PageAsyncTask(ShowOrders));
            Debug.WriteLine("Finish");
            lbl_Title.Text = "訂單信息";
        }

        private async Task ShowOrders()
        {
            var list = await GetMyPosts();
            gv_Orders.DataSource = list;
            gv_Orders.DataBind();
            foreach (var item in list)
            {
                Debug.WriteLine($"ID:{item.Id},Name:{item.Name}");
                Thread.Sleep(600);
            }
        }
        private async Task<List<Order>> GetMyPosts()
        {
            return await Task.Run(() => OrderRepository.Orders);
        }


    }

    public class Order
    {
        public string Id { get; set; }
        public string Name { get; set; }
    }

    public static class OrderRepository
    {
        public static List<Order> Orders = new List<Order>();
        static OrderRepository()
        {
            for (int i = 0; i < 10; i++)
            {
                Orders.Add(new Order() { Id = i.ToString(), Name = $"Pencil_{i}" });
            }
        }
    }
}

單元測試：

using System;

using System.Threading.Tasks;

namespace ExampleAsync.BLL

    public sealed class SystemUnderTest

        public static async Task SimpleAsync()

            await Task.Delay(10);

            throw new Exception("Should fail.");

using System.Threading.Tasks;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using ExampleAsync.BLL;

namespace ExampleAsync.UnitTest

    [TestClass]

    public class UnitTest1

        [TestMethod]

        public async Task CorrectlyFailingTest()

            await SystemUnderTest.SimpleAsync();

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