POST base64到webservice出错。。。。。
我要传送一个base64字符串到一个webservice

string postData = "base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH+iRVKDkbOmUiKpxW0/S6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn+96j7zp/wA=";
    byte[] dataArray = Encoding.Default.GetBytes(postData);
    HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage);
    request.Method = "POST";
    request.ContentLength = dataArray.Length;
    request.ContentType = "application/x-www-form-urlencoded";
    Stream dataStream = null;
    try
    {
        dataStream = request.GetRequestStream();
    }
    catch (Exception)
    {
    }
    dataStream.Write(dataArray, 0, dataArray.Length);
    dataStream.Close();

但是这个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。。

 [WebMethod]
public string GenerateOrder(string base64)
{ 
    byte[] buffer = Convert.FromBase64String(base64); //在这出错了。base64不对。。
}

所以在request设置那里是不是少设置了什么？怎样才能不让他转义呢？？
求助！ c#?webser Web服务 base64 HttpWebRequest C#
[解决办法]
还是老老实实添加 Web 引用吧，换种调用方式
[解决办法]

///<summary>
/// Base 64 Encoding with URL and Filename Safe Alphabet using UTF-8 character set. 
 
///</summary>
///<param name="str">The origianl string</param>
///<returns>The Base64 encoded string</returns>
public static string Base64ForUrlEncode(string str)
{
    byte[] encbuff = Encoding.UTF8.GetBytes(str);
    return HttpServerUtility.UrlTokenEncode(encbuff);
}

///<summary>
/// Decode Base64 encoded string with URL and Filename Safe Alphabet using UTF-8.
///</summary>
///<param name="str">Base64 code</param>
///<returns>The decoded string.</returns>
public static string Base64ForUrlDecode(string str)
{
    byte[] decbuff = HttpServerUtility.UrlTokenDecode(str);
    return Encoding.UTF8.GetString(decbuff);
}