diff --git a/29WxOrderWpf/Ctrls/BuyerCtrls/PDDBuyerOrderReadCtrl.xaml.cs b/29WxOrderWpf/Ctrls/BuyerCtrls/PDDBuyerOrderReadCtrl.xaml.cs
index 25ef381..a62e483 100644
--- a/29WxOrderWpf/Ctrls/BuyerCtrls/PDDBuyerOrderReadCtrl.xaml.cs
+++ b/29WxOrderWpf/Ctrls/BuyerCtrls/PDDBuyerOrderReadCtrl.xaml.cs
@@ -1264,7 +1264,7 @@ namespace _29WxOrderWpf.Ctrls.BuyerCtrls
 					{
 						// 退款状态有变化才发起修改(退款状态不能从退款成功变成未退款)
 						PddBuyerAfterSaleLiteInfo afterSaleRefundSuccessExist = null;
-						afterSaleRefundSuccessExist = lstPddBuyerAfterSaleInfoLite.FirstOrDefault(a => a.afterSalesId != afterSale.afterSalesId &&
+						afterSaleRefundSuccessExist = lstPddBuyerAfterSaleInfoLite.ToList().FirstOrDefault(a => a.afterSalesId != afterSale.afterSalesId &&
 						    a.orderSn == afterSale.orderSn && (a.AfterSaleStatusStr.Contains("退款成功") || a.AfterSaleStatusStr.Contains("交易已取消")));
 
 						if ((afterSaleRefundSuccessExist == null || afterSale.AfterSaleStatusStr == afterSaleRefundSuccessExist.AfterSaleStatusStr) &&