Windows Phone Web 访问 API 中的异步等待 [英] Async await in Windows Phone web access APIs

问题描述

WP8 是否支持 async/await 模式?

Is there support for the async/await pattern in WP8?

我需要从基于 Web 的 API 获取 XML，但看起来 WebClient 或 WebRequest 不支持它.

I need to get XML from a web-based API and it looks like that WebClient or WebRequest do not support it.

WP8 BCL 中是否有支持异步/等待的类可用于 Web 访问?如果没有，是否有我可以使用的库?

Are there classes that support async/await usable for web access in the WP8 BCL? And if not, is there a library I can use?

我知道创建包装器来支持它并不难，但这似乎是包含在 SDK 中的东西.

I know it is not that hard to create wrappers to support it, but this seems like a thing that would be included in the SDK.

推荐答案

WP8 BCL 中是否有支持 async/await 的类可用于 Web 访问?

Are there classes that support async/await usable for web access in the WP8 BCL?

这是在 WP8 SDK 内测期间提出的一个问题，所以我可以很遗憾地回答，不是.

This is a concern that has been raised during the closed beta of the WP8 SDK, so I can answer that unfortunately, no.

但正如您所提到的，制作自己的包装器相当容易.

But as you mentioned, it is reasonably easy to make your own wrappers.

例如:

public static class Extensions
{
    public static Task<string> DownloadStringTask(this WebClient webClient, Uri uri)
    {
        var tcs = new TaskCompletionSource<string>();

        webClient.DownloadStringCompleted += (s, e) =>
        {
            if (e.Error != null)
            {
                tcs.SetException(e.Error);
            }
            else
            {
                tcs.SetResult(e.Result);
            }
        };

        webClient.DownloadStringAsync(uri);

        return tcs.Task;
    }
}

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