//电商ID
private string EBusinessID = "1257164";
//电商加密私钥，快递鸟提供，注意保管，不要泄漏
private string AppKey = "63a33b7c-464c-4de6-b4a3-6e1fc19da51c";
//请求url
private string ReqURL = "http://api.kdniao.cc/Ebusiness/EbusinessOrderHandle.aspx";

/// <summary>
/// Json方式 查询订单物流轨迹
/// </summary>
/// <returns></returns>
public string postkuaidi(string com, string nu)
{
Dictionary<string, string> list = new Dictionary<string, string>();
#region 快递
list.Add("邮政平邮", "YZPY");
list.Add("邮政国内", "YZPY");
list.Add("中国邮政", "YZPY");
list.Add("申通快递", "STO");

#endregion
string typeCom = "";
foreach (var dc in list)
{
if (com == dc.Key)
{
typeCom = dc.Value;
}
}
string requestData = "{OrderCode:'',ShipperCode:'" + typeCom + "','LogisticCode':'" + nu + "'}";

Dictionary<string, string> param = new Dictionary<string, string>();
param.Add("RequestData", HttpUtility.UrlEncode(requestData, Encoding.UTF8));
param.Add("EBusinessID", EBusinessID);
param.Add("RequestType", "1002");
string dataSign = encrypt(requestData, AppKey, "UTF-8");
param.Add("DataSign", HttpUtility.UrlEncode(dataSign, Encoding.UTF8));
param.Add("DataType", "2");

string result = sendPost(ReqURL, param);

//根据公司业务处理返回的信息......
JObject jo = JObject.Parse(result);
return jo.ToString();
}

/// <summary>
/// Post方式提交数据，返回网页的源代码
/// </summary>
/// <param name="url">发送请求的 URL</param>
/// <param name="param">请求的参数集合</param>
/// <returns>远程资源的响应结果</returns>
private string sendPost(string url, Dictionary<string, string> param)
{
string result = "";
StringBuilder postData = new StringBuilder();
if (param != null && param.Count > 0)
{
foreach (var p in param)
{
if (postData.Length > 0)
{
postData.Append("&");
}
postData.Append(p.Key);
postData.Append("=");
postData.Append(p.Value);
}
}
byte[] byteData = Encoding.GetEncoding("UTF-8").GetBytes(postData.ToString());
try
{

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
request.Referer = url;
request.Accept = "*/*";
request.Timeout = 30 * 1000;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
request.Method = "POST";
request.ContentLength = byteData.Length;
Stream stream = request.GetRequestStream();
stream.Write(byteData, 0, byteData.Length);
stream.Flush();
stream.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream backStream = response.GetResponseStream();
StreamReader sr = new StreamReader(backStream, Encoding.GetEncoding("UTF-8"));
result = sr.ReadToEnd();
sr.Close();
backStream.Close();
response.Close();
request.Abort();
}
catch (Exception ex)
{
result = ex.Message;
}
return result;
}

///<summary>
///电商Sign签名
///</summary>
///<param name="content">内容</param>
///<param name="keyValue">Appkey</param>
///<param name="charset">URL编码 </param>
///<returns>DataSign签名</returns>
private string encrypt(String content, String keyValue, String charset)
{
if (keyValue != null)
{
return base64(MD5(content + keyValue, charset), charset);
}
return base64(MD5(content, charset), charset);
}

///<summary>
/// 字符串MD5加密
///</summary>
///<param name="str">要加密的字符串</param>
///<param name="charset">编码方式</param>
///<returns>密文</returns>
private string MD5(string str, string charset)
{
byte[] buffer = System.Text.Encoding.GetEncoding(charset).GetBytes(str);
try
{
System.Security.Cryptography.MD5CryptoServiceProvider check;
check = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] somme = check.ComputeHash(buffer);
string ret = "";
foreach (byte a in somme)
{
if (a < 16)
ret += "0" + a.ToString("X");
else
ret += a.ToString("X");
}
return ret.ToLower();
}
catch
{
throw;
}
}

/// <summary>
/// base64编码
/// </summary>
/// <param name="str">内容</param>
/// <param name="charset">编码方式</param>
/// <returns></returns>
private string base64(String str, String charset)
{
return Convert.ToBase64String(System.Text.Encoding.GetEncoding(charset).GetBytes(str));
}

通过smtp直接发送邮件