C# 参数按照ASCII码从小到大排序（字典序）

public static void requestPay() {  Dictionary<string, string> dics = new Dictionary<string, string>();  dics.Add("amount", amount);  dics.Add("callback_url", callback_url);  dics.Add("goodsname", goodsname);  dics.Add("merchno", merchno);  dics.Add("notify_url", notify_url);  dics.Add("ordno", ordno);  dics.Add("organno", organno);  dics.Add("version", version);  dics.Add("paytype", paytype);  getParamSrc(dics);}

public static String getParamSrc(Dictionary<string, string> paramsMap){  var vDic = (from objDic in paramsMap orderby objDic.Key ascending select objDic);  StringBuilder str = new StringBuilder();  foreach (KeyValuePair<string, string> kv in vDic)  {   string pkey = kv.Key;   string pvalue = kv.Value;   str.Append(pkey + "=" + pvalue + "&");  }  String result = str.ToString().Substring(0, str.ToString().Length - 1);  return result;}