如何在这种情况下使用 WebClient.DownloadDataAsync() 方法? [英] How to use the WebClient.DownloadDataAsync() method in this context?

问题描述

我的计划是让用户在我的程序中写下电影标题，我的程序将异步提取适当的信息，这样 UI 就不会冻结.

My plan is to have a user write down a movie title in my program and my program will pull the appropiate information asynchronously so the UI doesn't freeze up.

代码如下:

public class IMDB
    {
        WebClient WebClientX = new WebClient();
        byte[] Buffer = null;


        public string[] SearchForMovie(string SearchParameter)
        {
            //Format the search parameter so it forms a valid IMDB *SEARCH* url.
            //From within the search website we're going to pull the actual movie
            //link.
            string sitesearchURL = FindURL(SearchParameter);

            //Have a method download asynchronously the ENTIRE source code of the
            //IMDB *search* website.
            Buffer = WebClientX.DownloadDataAsync(sitesearchURL);


            //Pass the IMDB source code to method findInformation().

            //string [] lol = findInformation();

            //????

            //Profit.

            string[] lol = null;
            return lol;
        }

我的实际问题在于 WebClientX.DownloadDataAsync() 方法.我不能使用字符串 URL.我如何使用该内置函数来下载站点的字节(为了以后使用，我会将其转换为字符串，我知道如何执行此操作)并且不会冻结我的 GUI?

My actual problem lies in the WebClientX.DownloadDataAsync() method. I can't use a string URL for it. How can I use that built in function to download the bytes of the site (for later use I will convert this to string, I know how to do this) and without freezing up my GUI?

也许是一个清晰的 DownloadDataAsync 示例，以便我可以学习如何使用它?

Perhaps a clear cut example of the DownloadDataAsync so I can learn how to use it?

谢谢，你总是很棒的资源.

Thanks SO, you're always such a great resource.

推荐答案

有一个较新的 DownloadDataTaskAsync 方法可以让您等待结果.到目前为止，它更易于阅读且更易于连接.我会用那个...

There is a newer DownloadDataTaskAsync method that allows you to await the result. It is simpler to read and easier to wire up by far. I'd use that...

var client = new WebClient();

var data = await client.DownloadDataTaskAsync(new Uri(imageUrl));

await outstream.WriteAsync(data, 0, data.Length);

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