C# Web Api GetAsync + MVC 3.0 Async Controller

本文关键字：Async Controller MVC Web Api GetAsync | 更新日期: 2023-09-27 18:02:31

我只是想让大家反馈关于以下异步控制器使用Web Api HttpClient。这看起来很乱，有办法让它干净一点吗?有没有人有一个很好的包装围绕链接多个异步任务在一起?

public class HomeController : AsyncController
{
    public void IndexAsync()
    {
        var uri = "http://localhost:3018/service";
        var httpClient = new HttpClient(uri);
        AsyncManager.OutstandingOperations.Increment(2);
        httpClient.GetAsync(uri).ContinueWith(r =>
        {
            r.Result.Content.ReadAsAsync<List<string>>().ContinueWith(b =>
            {
                AsyncManager.Parameters["items"] = b.Result;
                AsyncManager.OutstandingOperations.Decrement();
            });
            AsyncManager.OutstandingOperations.Decrement();
        });
    }
    public ActionResult IndexCompleted(List<string> items)
    {
        return View(items);
    }
}

C# Web Api GetAsync + MVC 3.0 Async Controller

您似乎使用了许多异步调用和asyncmanager . outstandingoperations . decincrement()。下面的代码足以使用YQL异步加载Flickr照片信息。

public class HomeController : AsyncController
{
    public void IndexAsync()
    {
        var uri = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20flickr.photos.recent";
        var httpClient = new HttpClient(uri);
        AsyncManager.OutstandingOperations.Increment();
        httpClient.GetAsync("").ContinueWith(r =>
            {
                var xml = XElement.Load(r.Result.Content.ContentReadStream);
                var owners = from el in xml.Descendants("photo")
                                select (string)el.Attribute("owner");
                AsyncManager.Parameters["owners"] = owners;
                AsyncManager.OutstandingOperations.Decrement();
            });
    }
    public ActionResult IndexCompleted(IEnumerable<string> owners)
    {
        return View(owners);
    }
}

您可以查看http://pfelix.wordpress.com/2011/08/05/wcf-web-api-handling-requests-asynchronously/。

它包含一个基于任务迭代器技术(http://blogs.msdn.com/b/pfxteam/archive/2009/06/30/9809774.aspx)链接异步操作的示例。

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