判断证书

Mall.Common/Pay/WeChatPat/PayParam.cs

@@ -30,7 +30,7 @@ namespace Mall.Common.Pay.WeChatPat
         /// <summary>
         /// 退款金额
         /// </summary>
-        public decimal? RefundFee { get; set; }
+        public int? RefundFee { get; set; }
 
         /// <summary>
         /// 过期时间，格式（20141010121314）

Mall.WebApi/App_Code/PayUtil.cs

@@ -325,6 +325,10 @@ namespace Mall.WebApi.App_Code
             packageReq.SetParameter("sign", packageReq.CreateMd5Sign(_accessor, model.WeChatApiSecret));
             var reqXml = packageReq.ParseXml();
             LogHelper.WriteInfo("退款正式路径" + Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "App_Data/Certs/WeChatApp/" + model.WeChatPayCertificateUrl));
+            if (!System.IO.File.Exists(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "App_Data/Certs/WeChatApp/" + model.WeChatPayCertificateUrl)))
+            {
+                return new BaseResult() { IsSuccess = false, Message = "证书不存在" };
+            }
             var result = Common.Pay.WeChatPat.HttpHelper.Post(new HttpParam()
             {
                 Url = "https://api.mch.weixin.qq.com/secapi/pay/refund",