HttpWebRequest post调用

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    private String clientId = "3MVG959Nd8JMmavQaPxF2HrVGsn306RKnwTA7SSODtc5IUPODMMBgTAkn7zYz6iZT8WTdxfGdGOzDZxjAJO9c";
    private String clientSecret = "6888796626501949852";
    private String username = "[email protected]";
    private String password = "crm123456";
    private String environment = "地址";
    private String url = null;
    private static String accessToken = null;
    private static String instanceUrl = null;

    protected void Page_Load(object sender, EventArgs e)
    {

    }
 

    protected void Button1_Click(object sender, EventArgs e)
    {
        url = “地址”;
        string postData = String.Format("grant_type=password&client_id={0}&client_secret={1}&username={2}&password={3}"
            , clientId, clientSecret, username, password);
        PostHttpUrl(url, postData);
    }

    public static string PostHttpUrl(string uri, string postData)
    {
        try
        {
            //string url = uri + "?" + postData;
            byte[] data = Encoding.UTF8.GetBytes(postData);
            //处理HttpWebRequest访问https有安全证书的问题（ 请求被中止: 未能创建 SSL/TLS 安全通道。）
            ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); //发送地址                                            
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Method = "POST";//提交方式
            request.ContentLength = data.Length;
            //request.
            request.GetRequestStream().Write(data, 0, data.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();//获取响应
            Stream stream = response.GetResponseStream();            //client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            string result = string.Empty;
            using (StreamReader sr = new StreamReader(stream))
            {
                result = sr.ReadToEnd();
            }
            JavaScriptSerializer Jss = new JavaScriptSerializer();
            Dictionary respDic = (Dictionary)Jss.DeserializeObject(result);
            //通过键access_token获取值
            accessToken = respDic["access_token"].ToString();
            instanceUrl = respDic["instance_url"].ToString();
            return ""; // 返回的数据
        }
        catch (Exception ex)
        {
            return "网络错误：" + ex.Message.ToString();
        }
    }
}

 

做的过程中遇到过400错误：造成原因是传参的时候大小写字母搞混，碰到过SSL安全认证，加上红色的代码解决！记录一下，省的忘记！