//接口地址：http://192.168.234.215:9000/CRM/GetCustomerForNewIns --查询接口
//			http://192.168.234.215:9000/Insurance/SaveNewIns --保存保单接口
//接口调用方法及示例
///appId="A01DA1EA687C436786F950BD45CB999E"
///appKey="9C27CE71D3AB4593A136E0F6F51B04A9"
///appSecret="4B1638C8FD3D44B6B387B478EBED0C8D"
#region 第一步：定义返回参数、请求参数
public class ReturnModel
{
    public string code { get; set; }
    public string result { get; set; }
    public bool IsSuccess { get; set; }
    public object msg { get; set; }
}
public class PostParamModel
{
    public string jsonStr { get; set; }
}
#endregion

public class Test
{
    #region 第二步：定义加签方法
    /// <summary>
    /// 加签
    /// </summary>
    /// <param name="param"></param>
    /// <param name="prefAuthorization"></param>
    /// <returns></returns>
    private static Dictionary<string, string> getSign(string param, string prefAuthorization = "BTBPM ")
    {
        //待拼接未处理的字符串
        string strConcat = "";
        //待生成的签名
        string strSign = "";

        //配置文件配置以下三个参数，参数值由接口提供方提供，详见上面注释
        string appId = "";//配置文件获取或直接用上面的值
        string appKey = "";//配置文件获取或直接用上面的值
        string appSecret = "";//配置文件获取或直接用上面的值

        TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        int Timestamp = (int)ts.TotalSeconds;

        string AppSecret = appSecret;
        string Authorization = prefAuthorization + appId;
        string AppKey = appKey;

        string SignMethod = "md5";

        #region 根据参数名称的ASCII码表的顺序排序。
        Dictionary<string, string> headers = new Dictionary<string, string>();
        headers.Add("Authorization", Authorization);
        headers.Add("App-Key", AppKey);
        headers.Add("Timestamp", Timestamp.ToString());
        headers.Add("Sign-Method", SignMethod);
        headers.Add("param", param);

        var retHeaders = (from entry in headers
                          orderby entry.Key ascending
                          select entry).ToDictionary(pair => pair.Key, pair => pair.Value);
        #endregion

        #region 拼接的字符串
        foreach (KeyValuePair<string, string> k in retHeaders)
        {
            strConcat += k.Key + k.Value;
        }
        strConcat = AppSecret + strConcat + AppSecret;
        #endregion

        #region 将字符串用md5加密后，再生成大写的十六进制
        MD5 md5 = MD5.Create();
        byte[] bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(strConcat.ToString()));

        // 将MD5输出的二进制结果转换为大写的十六进制
        StringBuilder result = new StringBuilder();

        string _md5 = BitConverter.ToString(bytes).Replace("-", "");

        for (int i = 0; i < bytes.Length; i++)
        {
            string hex = bytes[i].ToString("X2");
            if (hex.Length == 1)
            {
                result.Append("0");
            }
            result.Append(hex);
        }

        strSign = result.ToString();
        #endregion

        Dictionary<string, string> header = new Dictionary<string, string>();

        header.Add("Authorization", Authorization);
        header.Add("App-Key", AppKey);
        header.Add("Timestamp", Timestamp.ToString());
        header.Add("Sign-Method", SignMethod);
        header.Add("Sign", strSign);

        return header;
    }
    #endregion

    #region 第三步：定义web请求方法
    //POST方式发送得结果
    public static string doPostRequest(out string errMsg, string url, string data, Dictionary<string, string> headerSign)
    {
        errMsg = "";

        string strURL = url;
        System.Net.HttpWebRequest request;
        request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
        request.Method = "POST";
        request.ContentType = "application/json;charset=UTF-8";

        foreach (KeyValuePair<string, string> kp in headerSign)
        {
            request.Headers.Add(kp.Key, kp.Value);
        }

        string paraUrlCoded = data;
        byte[] payload;
        payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
        request.ContentLength = payload.Length;
        Stream writer = request.GetRequestStream();
        writer.Write(payload, 0, payload.Length);
        writer.Close();
        System.Net.HttpWebResponse response;
        response = (System.Net.HttpWebResponse)request.GetResponse();
        System.IO.Stream s;
        s = response.GetResponseStream();
        string StrDate = "";
        string strValue = "";
        StreamReader Reader = new StreamReader(s, Encoding.UTF8);
        while ((StrDate = Reader.ReadLine()) != null)
        {
            strValue += StrDate + "\r\n";
        }
        return strValue;
    }
    #endregion

    #region 第四步：定义接口请求方法
    /// <summary>
    /// 调用接口
    /// </summary>
    /// <param name="err_msg">请求结果信息</param>
    /// <param name="url">请求接口地址</param>
    /// <param name="postParam">请求参数Model，实体类模型</param>
    /// <returns>是否成功</returns>
    protected bool RequestToAPI<T>(out string msg, string url, T postParam)
    {
        msg = "";
        string jsonStr = JsonConvert.SerializeObject(postParam);
        Dictionary<string, string> header = new Dictionary<string, string>();
        header = getSign(jsonStr);

        PostParamModel pm = new PostParamModel();
        pm.jsonStr = jsonStr;
        string jsonPm = JsonConvert.SerializeObject(pm);

        string ret = doPostRequest(out msg, url, jsonPm, header);
        ReturnModel response = JsonConvert.DeserializeObject<ReturnModel>(ret);
        if (response == null)
        {
            msg = "请求失败";
            return false;
        }

        if (response.IsSuccess && response.code == "28000")
        {
            msg = response.result;
            return true;
        }
        else
        {
            msg = response.result;
            return false;
        }
    }
    #endregion

    //示例：
    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public bool Sex { get; set; }
        public decimal Height { get; set; }
    }
    public void Test()
    {
        //接口接收参数的实体模型
        Person p = new Person
        {
            Name = "小明",
            Age = 18,
            Sex = true,
            Height = 175
        };
        string msg = "";
        bool ret = RequestToAPI(out msg, "http://192.168.1.1/CRM/TestApi", p);
        if (ret)
        {
            //...
        }
        else
        {
            //...
        }
    }
}