增加：获取缓存的剩余生存时间

Admin.NET/Admin.NET.Core/Entity/SysWechatRefund.cs

@@ -63,7 +63,7 @@ public class SysWechatRefund : EntityBase
     /// 退款资金来源, 可不传，默认使用未结算资金退款（仅对老资金流商户适用）
     /// </summary>
     [SugarColumn(ColumnDescription = "退款资金来源", Length = 32)]
-    public string FundsAccount { get; set; }
+    public string? FundsAccount { get; set; }
 
     /// <summary>
     /// 关联的商户订单号

Admin.NET/Admin.NET.Core/Service/Cache/SysCacheService.cs

@@ -62,6 +62,17 @@ public class SysCacheService : IDynamicApiController, ISingleton
         return _cacheProvider.Cache.Set($"{_cacheOptions.Prefix}{key}", value, expire);
     }
 
+    /// <summary> 
+    /// 获取缓存的剩余生存时间 
+    /// </summary> 
+    /// <param name="key"></param> 
+    /// <returns></returns> 
+    [NonAction]
+    public TimeSpan GetExpire(string key)
+    {
+        return _cacheProvider.Cache.GetExpire(key);
+    }
+
     /// <summary>
     /// 获取缓存
     /// </summary>