如何在asp.net webform中使用async/await实现异步页面? [英] How to use async/await to achieve asynchronous page in asp.net webform?

问题描述

我们现在可以在 ASP.NET MVC 4 中使用 async/await 关键字.

We can now use the async/await key words in ASP.NET MVC 4.

public async Task<ActionResult> TestAsync()
{
    WebClient client = new WebClient();
    return Content(await client.DownloadStringTaskAsync("http://www.google.com"));
}

但是如何在 ASP.NET WebForms 中使用它?

But how to use it in ASP.NET WebForms?

推荐答案

一种简单的方法是让您的事件处理程序 async.首先，将 Async="true" 参数添加到 @Page 指令，然后您应该能够编写异步事件处理程序:

One easy way is to just make your event handlers async. First, add the Async="true" parameter to the @Page directive, and then you should be able to write async event handlers as such:

protected async void Page_Load(object sender, EventArgs e)
{
  var client = new WebClient();
  var content = await client.DownloadStringTaskAsync("http://www.google.com");
  Response.Write(content);
}

我说应该能够"是因为我自己还没有真正尝试过.但它应该可以工作.

I say "should be able to" because I haven't actually tried this out myself. But it should work.

更新:这对于Page_Load不起作用(请参阅此 MSDN 论坛主题)，但应该适用于其他事件，例如按钮点击.

Update: This does not work for Page_Load (see this MSDN forum thread), but should work for other events such as button clicks.

更新:这确实适用于 ASP.NET 4.5 中的 Page_Load.此外，他们添加了检查您是否不正确地使用 async 事件处理程序.观看此视频了解详情.

Update: This does work for Page_Load in ASP.NET 4.5. Also, they added checks if you improperly use an async event handler. See this video for details.

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