我正在尝试使用DownloadStringAsync下载一些HTML源代码。我的代码如下所示:
WebClient client = new WebClient();
client.DownloadStringCompleted +=
new DownloadStringCompletedEventHandler(DownloadStringCallback2);
client.DownloadStringAsync(new Uri(url));
private void DownloadStringCallback2(Object sender, DownloadStringCompletedEventArgs e)
{
source = (string)e.Result;
if (!source.Contains("<!-- Inline markers start rendering here. -->"))
MessageBox.Show("Nope");
else
MessageBox.Show("Worked");
}
如果查看变量“源”,我可以看到其中有一些源,但不是全部。但是,如果我这样做是可行的:
while (true)
{
source = wb.DownloadString(url);
if (source.Contains("<!-- Inline markers start rendering here. -->"))
break;
}
不幸的是,由于WP8没有DownloadString,所以我无法使用该方法。
有谁知道如何解决此问题,或者是否有更好的方法?
最佳答案
此功能应该可以帮助您
public static Task<string> DownloadString(Uri url)
{
var tcs = new TaskCompletionSource<string>();
var wc = new WebClient();
wc.DownloadStringCompleted += (s, e) =>
{
if (e.Error != null) tcs.TrySetException(e.Error);
else if (e.Cancelled) tcs.TrySetCanceled();
else tcs.TrySetResult(e.Result);
};
wc.DownloadStringAsync(url);
return tcs.Task;
}