C# 参数按照ASCII码从小到大排序（字典序）

在对接第三方快递的时候，第三方会要求参数按照ASCII码从小到大排序。如下：

 1 public static void requestPay()
 2  {
 3        Dictionary<string, string> dics = new Dictionary<string, string>();
 4        dics.Add("amount", amount);
 5        dics.Add("callback_url", callback_url);
 6        dics.Add("goodsname", goodsname);
 7        dics.Add("merchno", merchno);
 8        dics.Add("notify_url", notify_url);
 9        dics.Add("ordno", ordno);
10        dics.Add("organno", organno);
11        dics.Add("version", version);
12        dics.Add("paytype", paytype);
13 
14        getParamSrc(dics);
15 }
16 
17 public static String getParamSrc(Dictionary<string, string> paramsMap)
18 {
19        var vDic = (from objDic in paramsMap orderby objDic.Key ascending select objDic);
20        StringBuilder str = new StringBuilder();
21        foreach (KeyValuePair<string, string> kv in vDic)
22        {
23            string pkey = kv.Key;
24            string pvalue = kv.Value;
25            str.Append(pkey + "=" + pvalue + "&");
26         }
27 
28         String result = str.ToString().Substring(0, str.ToString().Length - 1);
29         return result;
30 }