这个base64在requestHeader里面变成了

base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH%2BiRVKDkbOmUiKpxW0%2FS6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn%2B96j7zp%2FwA%3D

他把base64里面一些/和= 给转成%2F之类的东西了。

所以webservice接收到的参数是错的。。

解决办法：

 

string base64 = "base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH+iRVKDkbOmUiKpxW0/S6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn+96j7zp/wA=";byte[] buffer = Convert.FromBase64String(base64);string Base64StrData = Convert.ToBase64String(buffer).Replace("+", "%2B");//注意加号（’+‘）的替换处理，否则由于加号经过Url传递后变成空格而得不到合法的Base64字符串        string postData = "str=" + Base64StrData;    byte[] dataArray = Encoding.Default.GetBytes(postData);

 

/// 
        /// POST请求与获取结果        /// 
        public static string HttpPost(string Url, string postDataStr)        {            try            {                postDataStr = postDataStr.Replace("+", "%2B");                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);                request.Method = "POST";                request.Timeout = 6000000;                request.ContentType = "application/x-www-form-urlencoded";                request.ContentLength = postDataStr.Length;                StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII);                writer.Write(postDataStr);                writer.Flush();                HttpWebResponse response = (HttpWebResponse)request.GetResponse();                string encoding = response.ContentEncoding;                if (encoding == null || encoding.Length < 1)                {                    encoding = "UTF-8"; //默认编码                }                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));                string retString = reader.ReadToEnd();                return retString;            }            catch (Exception ex)            {                return null;            }        }