/// <summary>
/// 指定Post地址使用Get 方式获取全部字符串
/// </summary>
/// <param name="url">请求后台地址</param>
/// <returns></returns>
public static string Post(string url, Dictionary<string, string> dic)
{
string result = "";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/json";
#region 添加Post 参数
StringBuilder builder = new StringBuilder();
int i = 0;
foreach (var item in dic)
{
if (i > 0)
builder.Append("&");
builder.AppendFormat("{0}={1}", item.Key, item.Value);
i++;
}
byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
req.ContentLength = data.Length;
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(data, 0, data.Length);
reqStream.Close();
}
#endregion
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
//获取响应内容
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
return result;
}


/// <summary>
/// json 格式 Post
/// </summary>
/// <param name="url"></param>
/// <param name="obj">对象可以的,会进行 JSON.SerializeAllField()</param>
/// <param name="timeoutSeconds">TimeOut 秒数</param>
/// <returns></returns>
public static string Post(string url, object obj = null, int timeoutSeconds = 15)
{


if (string.IsNullOrWhiteSpace(url))
return "";

Encoding encode = Encoding.UTF8;
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
myRequest.ContentType = "application/json;charset=utf-8";
myRequest.Method = "POST";// HttpUtil.UrlMethod.POST.ToString();
if (timeoutSeconds < 3)
timeoutSeconds = 3;

byte[] bs = null;
myRequest.Timeout = timeoutSeconds * 1000;
if (obj != null)
{
bs = encode.GetBytes(JsonConvert.SerializeObject(obj, new JsonSerializerSettings { DateTimeZoneHandling = DateTimeZoneHandling.Local }));

myRequest.ContentLength = bs.Length;
}
else
myRequest.ContentLength = 0;


using (Stream reqStream = myRequest.GetRequestStream())
{
if (obj != null)
reqStream.Write(bs, 0, bs.Length);
reqStream.Close();
}
try
{
using (HttpWebResponse response = (HttpWebResponse)myRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(response.GetResponseStream(), encode))
{
var responseData = reader.ReadToEnd().ToString();
return responseData;
}
}
}
catch (WebException ex)
{
throw ex;
}
}