group by 问题

``` csharp
    /// <summary>
    /// 模块
    /// </summary>
    [Table(Name = "sys_menu")]
    public class SysMenu 
    {
        /// <summary>
        /// 编码
        /// </summary>
        public string Code { get; set; }
        /// <summary>
        /// 菜单标题
        /// </summary>
        public string Name { get; set; }

public long Id {get;set;}
    }

[Table(Name = "sys_menu_operate")]
    public class SysMenuOperate 
    {
        public long Id {get;set;}
        /// <summary>
        /// 操作名称
        /// </summary>
        [Column(StringLength = 1024)]
        public string Name { get; set; }

/// <summary>
        /// 前端操作的标识
        /// </summary>
        [Column(StringLength = 1024)]
        public string Code { get; set; }

public long MenuId { get; set; }
      
    }
    
    void GetAllStructualPermissionsAsync(long menuid){
        var list=freesql.Select<SysMenu, SysMenuOperate>()
                .LeftJoin(x => x.t1.Id == x.t2.MenuId)
                .Where(x => x.t1.Id == menuid)
                .GroupBy(x => new { x.t1.Id, x.t1.Name })
                .ToList(z=>z.Value.Item2??null);

}
```
出现异常:
```
Property 'SysMenuOperate Item2' is not defined for type 'SysMenu' (Parameter 'property')
```

2881099/FreeSql-ORM

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