公共请求参数：

public class MemberModel
{

    public string timestamp { get; set; }

    public string method { get; set; }

    public string app_id { get; set; }

    public string charset { get; set; }

    public string sign_type { get; set; } 

    public string sign { get; set; }

    public string version { get; set; }

    public string apiSecret { get; set; }

    public content content { get; set; }

}

public class content
{
        // IsConditionItem 是否必填  IsDatetime 是否日期时间  IsNum  是否数字
        //会员卡号
        [PropertyMappingAttribute(IsConditionItem = false, IsDatetime = false, IsNum = false)]
        public string member_code { get; set; }
        //union_id
        [PropertyMappingAttribute(IsConditionItem = false, IsDatetime = false, IsNum = false)]
        public string union_id { get; set; }

}

        --请求例子
          string json = "timestamp=2017-08-10 10:11:53&method=fzapi.crm.member_unbind_unionid&app_id=FZ200710011&charset=utf-8&sign_type=K11&content={\"member_code\":\"0599006008465101\",\"union_id\":\"o1L_Jwn1NdA2T3RgaaXNw4W5f3T8\",\"openid\":\"ojI8LjwcHMHL9KyrLAZwTv81twK4\",\"openid_type\":\"01\"}&version=1.0.0&sign=a502a2b312a663489fe5eefb5a3cc5b9";


            byte[] data = encoding.GetBytes(json);

            // Prepare web request
            HttpWebRequest myRequest =
                (HttpWebRequest)WebRequest.Create("http://localhost:32052/fzapi.ashx");

            myRequest.Method = "POST";
            //  myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentType = "application/json";
            myRequest.ContentLength = data.Length;
            Stream newStream = myRequest.GetRequestStream();
            // Send the data.
            newStream.Write(data, 0, data.Length);
            newStream.Close();
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            string strresponse = reader.ReadToEnd();
            --JSON转字典
          public static Dictionary<string, object> JsonToDictionary(string jsonData)
        {

            //实例化JavaScriptSerializer类的新实例
            JavaScriptSerializer jss = new JavaScriptSerializer();
            try
            {
                //将指定的 JSON 字符串转换为 Dictionary<string, object> 类型的对象
                return jss.Deserialize<Dictionary<string, object>>(jsonData);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }  
           --字典排序
            public static string DictionarySort(Dictionary<string, object> dic)
        {
            StringBuilder sb = new StringBuilder();
            if (dic.Count > 0)
            {
                List<KeyValuePair<string, object>> lst = new List<KeyValuePair<string, object>>(dic);
                lst.Sort(delegate(KeyValuePair<string, object> s1, KeyValuePair<string, object> s2)
                {
                    return s1.Key.CompareTo(s2.Key);
                });
                dic.Clear();

                for (int i = 0; i < lst.Count; i++)
                {
                    sb.Append((i == 0 ? "" : "&") + lst[i].Key + "=" + lst[i].Value);
                }


            }
            return sb.ToString().Replace("=", "+").Replace("&", "").Replace("%3d", "=").Replace("%2f", "/");
        }
 MD5加密：

sign = md5(DictionarySort(JsonToDictionary(JsonConvert.SerializeObject(MemberModel)))).ToLower();


 --注意 
 1，MemberModel的Sign参数不参与加密
 2，MemberModel的content部分为json
 eg:
 {"timestamp":"2017-08-10 10:11:53","method":"fzapi.crm.member_unbind_unionid","app_id":"FZ200710011","charset":"utf-8","sign_type":"K11","content":"{\"member_code\":\"0599006008465101\",\"union_id\":\"o1L_Jwn1NdA2T3RgaaXNw4W5f3T8\",\"openid\":\"ojI8LjwcHMHL9KyrLAZwTv81twK4\",\"openid_type\":\"01\"}","version":"1.0.0","apiSecret":"7msj3cin"}

sign说明

JsonToDictionary ：对JSON的数据进行字典化处理并且加上apiSecret 键值对 Sign参数不参与加密

DictionarySort：数据按键值对的KEY进行按acii 进行升序进行排序

md5/SHA256： MD5加密并且转为小写/SHA256(加密方式按具体需求决定)