WebRequest wq = WebRequest.Create(this.address);
HttpWebRequest hq = wq as HttpWebRequest;
 
string username = "keguangqiang@163.com";
string password = "3216731ks";
string appkey = "5786724301";
 
System.Net.CredentialCache cache = new CredentialCache();
cache.Add(new Uri(this.address), "Basic", new NetworkCredential(username, password));
hq.Credentials = cache;
hq.Headers.Add("Authorization","Basic " +Convert.ToBase64String(new System.Text.ASCIIEncoding().GetBytes(username+":"+password)));
 
System.Net.WebResponse webresponse = hq.GetResponse();
System.IO.Stream receiveStream = webresponse.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(receiveStream, System.Text.Encoding.UTF8);
string json = reader.ReadToEnd();