添加未选择导入数据提示报错信息

Areas/Admin/Controllers/MainServer/StoreMachineApplyController.cs

@@ -484,7 +484,10 @@ namespace MySystem.Areas.Admin.Controllers
             var BrandId = 0;
             var FromStoreId = 0;
             string error = "";
-
+            if (string.IsNullOrEmpty(ExcelData))
+            {
+                return "Warning|" + "请选择要导入的数据";
+            }
             ExcelData = HttpUtility.UrlDecode(ExcelData);
             JsonData list = JsonMapper.ToObject(ExcelData);
             List<string> PosSnList = new List<string>();
@@ -580,7 +583,7 @@ namespace MySystem.Areas.Admin.Controllers
                 PosMachinesTwo machine = db.PosMachinesTwo.FirstOrDefault(m => m.Id == machinefor.SnId && m.BuyUserId == 0 && m.UserId == 0) ?? new PosMachinesTwo();
                 if (machine.Id > 0)
                 {
-                    if(machine.BrandId != BrandId)
+                    if (machine.BrandId != BrandId)
                     {
                         return machine.PosSn + "与表格里填写的品牌不一致";
                     }