public static SortedDictionary<string, object> KeySort(JObject obj)
        {
            var res = new SortedDictionary<string, object>();
            foreach (var x in obj)
            {
                if (x.Value is JValue) res.Add(x.Key, x.Value);
                else if (x.Value is JObject) res.Add(x.Key, KeySort((JObject)x.Value));
                else if (x.Value is JArray)
                {
                    var tmp = new SortedDictionary<string, object>[x.Value.Count()];
                    for (var i = 0; i < x.Value.Count(); i++)
                    {
                        tmp[i] = KeySort((JObject)x.Value[i]);
                    }
                    res.Add(x.Key, tmp);
                }
            }
            return res;
        }

var MethodCont = new JObject {
                  new JProperty("deptNo","00000123"),//
                  new JProperty("warehouseNo","1100000001")//
                 ,new JProperty("abcad","")
                 ,new JProperty("abdcaz","")
                 ,new JProperty("1234","")
                 ,new JProperty("0123","")
                 ,new JProperty("0113","")
                };
//不排序
var json2 = JsonConvert.SerializeObject(MethodCont);
//排序
var target = KeySort(MethodCont);
var json = JsonConvert.SerializeObject(target, Formatting.Indented);//缩进

{
    "deptNo": "EBU0000000123",
    "warehouseNo": "1100000001",
    "abcad": "",
    "abdcaz": "",
    "1234": "",
    "0123": "",
    "0113": ""
}

{
    "0113": "",
    "0123": "",
    "1234": "",
    "abcad": "",
    "abdcaz": "",
    "deptNo": "EBU0000000123",
    "warehouseNo": "1100000001"
}

Dictionary<string, string> dic = new Dictionary<string, string>
                    {
                       { "access_token",access_token},
                       { "app_key",app_key },
                       { "method",method },
                       { "timestamp",timestamp },
                       { "v",v },
                     };

var dicOrderby = string.Join("&", dic.OrderBy(p => p.Key).Select(p => $"{p.Key}{p.Value}"));

这里dic.OrderBy就是进行排序的操作，dic是Dictiopnary类型，是一个字典，
字典就是进行排序嘛，按照字母顺序之类的

排好顺序后，然后就是开始Select所需要的内容了。
string.Join("&",""),是可以设置链接符
String.Join 方法 (String, String[])