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  • 无法创建类型的常量值。此上下文仅支持基元类型或枚举类型。

    源代码

    错误:无法创建类型的常量值。此上下文仅支持基元类型或枚举类型。

    报错原因就是因为下面标红的那一行

    //hourApplys 的类型是IQueryable
     var hourApplys = hourApplyList.OrderBy(h => h.Id).Skip((pageIndex - 1) * pageSize).Take(pageSize);
                var list = from h in hourApplys
                           select new HourApplyVM
                           {
                               Id = h.Id,
                               UserId = h.UserId,
                               SubjectName = h.SubjectName,
                               Type = h.Type,
                               TypeName = h.Type == 1 ? "专业科目" : "行业公需",
                               EducationWay = h.EducationWay,
                               EducationWayName = (EducationWayDic.Keys.Contains(h.EducationWay) ? EducationWayDic.FirstOrDefault(d => d.Key == h.EducationWay).Value : ""),
                               Hours = h.Hours,
                               CreateTime = h.CreateTime,
                               AuditState = h.AuditState,
                               AuditDate = h.AuditDate,
                               AuditRemark = h.AuditRemark,
                               Remark = h.Remark
                           };

    修改后的代码

    //hourApplys 的类型是List
     var hourApplys = hourApplyList.OrderBy(h => h.Id).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
                var list = from h in hourApplys
                           select new HourApplyVM
                           {
                               Id = h.Id,
                               UserId = h.UserId,
                               SubjectName = h.SubjectName,
                               Type = h.Type,
                               TypeName = h.Type == 1 ? "专业科目" : "行业公需",
                               EducationWay = h.EducationWay,
                               EducationWayName = (EducationWayDic.Keys.Contains(h.EducationWay) ? EducationWayDic.FirstOrDefault(d => d.Key == h.EducationWay).Value : ""),
                               Hours = h.Hours,
                               CreateTime = h.CreateTime,
                               AuditState = h.AuditState,
                               AuditDate = h.AuditDate,
                               AuditRemark = h.AuditRemark,
                               Remark = h.Remark
                           };

     要保证数据类型相同,比如都是List,因为我的EducationWayDic是List,但hourApplys 是IEnumerable,所以报异常了

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  • 原文地址:https://www.cnblogs.com/xiaonangua/p/10861456.html
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