本文介绍了WebClient.DownloadString需要约15秒首次调用时的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
string url = "http://google.com/index.html";
WebClient client = new WebClient();
Stopwatch sw = new Stopwatch();
sw.Start();
string text = client.DownloadString(url);
sw.Stop();
Console.WriteLine(sw.Elapsed);
秒表说 DownloadString 方法以13-15当第一秒调用，但多次呼吁采取明智的大量时间。这是如何发生，如何解决这个问题？
Stopwatch says DownloadString method takes 13-15 seconds when first called, but repeated calls take sensible amounts of time. How does this happen and how do I fix it?
推荐答案
有可能是一对夫妇的事情，会导致对延迟第一个电话如检测代理设置。尝试将代理设置为null：
There may be a couple of things that would cause a delay on the first call such as detecting proxy settings. Try setting the proxy to null:
client.Proxy = null;
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