主题：[求助]这个api怎么写？圆通空单api

[求助]这个api怎么写？

按顺序组合操作进行md5计算 是怎么弄。我就是这个不懂，是这样吗？拼成字符串进行MD5计算？ 签名数据= MD5计算代码（ "KA4js3k2APPIDK100122APPSecretKA42k2ltemName衣服ItemNumber ltemWeightO 5LogisticIDB2201601031ReceiverAddress华徐公路3029弄28号ReceiverArea青浦区区ReceiverCity.上海市eceiverMobile13821025484ReceiverName王勇ReceiverPostcode 201 705ReceiverProv,上海SenderAddress华徐公路3029弄28号SenderArea青浦区SenderCity上海市SenderMobile1382 1025484SenderNarme王勇SenderPostcode351200SenderProv.上海KA4js3k2"）   hc.FormData.Add("APPSign",签名数据 )

淘宝api需要求租的空包件虚拟物流圆通1块 2020-03-10 22:29:55
    public class SignHelper
    {
        public static string GetSign(SortedDictionary<string, string> paramList, string appKey = "")
        {
            paramList.Remove("APPSign");
            StringBuilder sb = new StringBuilder(appKey);
            foreach (var p in paramList)
                sb.Append(p.Key).Append(p.Value);
            sb.Append(appKey);
            return GetMD5(sb.ToString());
        }
        public static string GetMD5(string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;
            var sb = new StringBuilder(32);
            var md5 = System.Security.Cryptography.MD5.Create();
            var output = md5.ComputeHash(Encoding.UTF8.GetBytes(str));
            for (int i = 0; i < output.Length; i++)
                sb.Append(output[i].ToString("X").PadLeft(2, '0'));
            return sb.ToString();
        }

    }



调用 SignHelper.GetSign就行了  就是我截图中的