摘要
最近想着将项目中的部分耗时的操作,进行异步化。就自己弄个demo进行学习。只需下面几个步骤就可以将aspx页面中注册异步操作。
demo
比如我们需要抓取某个url的内容,这个时候我们可能会有下面的一个方法。
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Threading.Tasks; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace Wolfy.AsyncWeb { public partial class Index : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { this.Page.RegisterAsyncTask(new PageAsyncTask(GetHtmlAsync)); } } private async Task GetHtmlAsync() { string url = "http://www.cnblogs.com/"; WebClient client = new WebClient(); client.Encoding = Encoding.UTF8; string html = await client.DownloadStringTaskAsync(url); string strPath = MapPath("~/html"); if (!Directory.Exists(strPath)) { Directory.CreateDirectory(strPath); } string savePath = Path.Combine(strPath, "blog.txt"); using (FileStream fs = new FileStream(savePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite)) { byte[] buffer = Encoding.UTF8.GetBytes(html); await fs.WriteAsync(buffer, 0, buffer.Length); } } } }
这时候以为大功告成了,浏览页面的时候发现还是少了点东西。
找到对应的页面添加上async特性。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="Wolfy.AsyncWeb.Index" Async="true" %>
结果
参考
http://blog.csdn.net/youaregoo/article/details/8973387
http://mrbool.com/how-to-create-asynchronous-device-page-in-asp-net-4-5/26022
http://www.cnblogs.com/dudu/p/aspnet-webform-async.html
asp.net webform中使用async,await实现异步操作
标签:odi logs code 注册 div ring void 异步操作 deb
原文地址:https://www.cnblogs.com/Jeely/p/11062595.html