.net后台使用post方式对指定地址的方法传值并且获取结果的方法

　　　　/// <summary>
/// .net 后台 post http地址请求
/// </summary>
/// <param name="uri">请求地址</param>
/// <param name="postData">请求数据</param>
/// type=application/x-www-form-urlencoded
/// type=application/json;charset=UTF-8
/// <returns></returns>
private string PostHttpUrl(string uri, string postData)
{
try
{
byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(postData);
HttpWebRequest objWebRequest = (HttpWebRequest)WebRequest.Create(uri); //发送地址
objWebRequest.Method = "POST";//提交方式
objWebRequest.ContentType = "application/json;charset=UTF-8";
objWebRequest.ContentLength = byteArray.Length;
using (Stream newStream = objWebRequest.GetRequestStream())
{
newStream.Write(byteArray, 0, byteArray.Length); //写入参数
newStream.Close();
}
HttpWebResponse response = (HttpWebResponse)objWebRequest.GetResponse();//获取响应
StreamReader sr = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
return sr.ReadToEnd(); // 返回的数据
}
catch (Exception ex)
{
return "网络错误：" + ex.Message.ToString();
}
}