fix 处理离职人员

Src/Dlhis.Canteen/Order/Services/Implements/BalanceService.cs

@@ -614,7 +614,14 @@ public class BalanceService : IBalanceService
     {
         foreach (var request in requests)
         {
-            var gainfo = await _dbContext.Queryable<GainfoEntity>().Where(x => x.Code == request.UserCode).SingleAsync();
+            var gainfo = await _dbContext.Queryable<GainfoEntity>()
+                             .Where(x => x.Code == request.UserCode)
+                             .SingleAsync()
+                         ?? await _dbContext.Queryable<GainfoEntity>().AS("GainfoLeave")
+                             .Where(x => x.Code == request.UserCode)
+                             .SingleAsync();
+
+            (gainfo == null).ThrowIfTrue($"工号{request.UserCode}不存在");
 
             await _dbContext.InsertAsync(new BalanceRecordEntity
             {