C# 参数按照ASCII码从小到大排序（字典序）

在对接第三方支付的时候，第三方会要求参数按照ascii码从小到大排序。如下：

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;
}

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