C#后台请求其它网站页面

/// <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 string RequestPost(string url, string builder)
{
string result = "";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
//req.ContentType = "text/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);
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;
}
}