fix 补充被分配人校验

Src/Dlhis.Basic/WorkGrids/Services/Implements/WorkGridService.cs

@@ -161,6 +161,11 @@ public class WorkGridService : IWorkGridService
     /// <inheritdoc />
     public async Task ChangeAsync(string from, string to)
     {
+        if (await _dbContext.Queryable<WorkGridEntity>().Where(x => x.LeaderUserCode == to).AnyAsync())
+        {
+            true.ThrowIfTrue($"{to}已存在网格,不可操作");
+        }
+
         var workGrid = await _dbContext.Queryable<WorkGridEntity>().Where(x => x.LeaderUserCode == from).SingleAsync();
         workGrid.ThrowIfNull($"{from}管理的网格不存在");
 
@@ -238,12 +243,12 @@ public class WorkGridService : IWorkGridService
             .SingleAsync();
 
         myWorkGrid.ThrowIfNull("工作网格尚未配置,请联系管理员");
-        
+
         var existsAssigned = await _dbContext.Queryable<WorkGridUserEntity>()
             .Where(x => request.UserCodes.Contains(x.UserCode))
             .AnyAsync();
         existsAssigned.ThrowIfTrue("存在已经分配人员,操作失败!");
-        
+
         //检查配置的人员
         var count = await _dbContext.Queryable<GainfoEntity>()
             .Where(x => x.Factory == currentFactory)