Question

我有4个表Transactions，Attachment，SubReportType＆amp; SubRepRole。我在我的缓存上有用户角色。我想拥有与用户角色相关的附件[用户可能有多个角色]

List<int> userrole = new List<int>();
UserContext user_details = (UserContext)HttpContext.Current.Cache["UserContext"];
IList<UserRole> userrole_id = user_details.UserRoleModuleWise;

var  query = (from trans in objContext.Transactions
             join attch in objContext.Attachment on trans.TransId equals attch.TransId
             join subrept in objContext.SubReportType on trans.SubRepId equals subrept.SubRepId
             join subreprl in objContext.SubRepRole on trans.SubRepId equals subreprl.SubRepId
             join selectedrole in userrole_id  on subreprl.RoleId equals selectedrole.RoleId
             /*where obj.Contains(subreprl.RoleId) */orderby trans.TransDate
           select new AttachmentModel
           {
               Createdate = attch.CreatedDateTime,
               FileType = attch.FileType,
               FileName = attch.FileName,
               Attachid = attch.AttachedId,
               FileTag = attch.FileTag,
               Transid = trans.TransId,
               SubReportName = subrept.SubRepName,
               RandomPinNo = attch.FileRandomPin
           }).ToList();

现在收到此错误：

无法创建类型的常量值 'User.Common.DataContract.UserRole'。只有原始类型或在此上下文中支持枚举类型。

请帮助解决这个问题。试过“包含”但是类型转换错误即将来临。只是想让那些角色在user_details.UserRoleModuleWise中的记录。 user_details.UserRoleModuleWise是一个具有RoleId和RoleName

的数组

Answer 1

您需要将Contains与正确值的数组一起使用：

where user_details.UserRoleModuleWise.Select(urmw => urmw.RoleId).ToArray().Contains(aRoleId => aRoleId == subreprl.RoleId)

Answer 2

创建了一个公共类 -

 object[] common_data = new object[4];
     UserContext user_details = (UserContext)HttpContext.Current.Cache["UserContext"];
        List<UserRole> userrole_id = user_details.UserRoleModuleWise.ToList();
       int[] roleid = { -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20 };
        string[] rolename = { "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "" };
        for (int i = 0; i < userrole_id.Count; i++)
            {
                roleid[i] = Convert.ToInt32(userrole_id[i].RoleId);
                rolename[i] = Convert.ToString(userrole_id[i].RoleName);
                r_id.Add(roleid[i], rolename[i]);
            }
            common_data[0] = roleid; 
            common_data[1] = rolename; 
           //common_data[2] = username; 
           common_data[3] = userrole_id.Count;

然后在我的存储库中使用 -

        User_common_data ucd = new User_common_data();
        object[] ucd_data = ucd.user_common_details();
        int[] roles = (int[]) ucd_data[0];

        var query = (from obj in objContext.ReportType
                     join obj1 in objContext.SubReportType on obj.RepId equals obj1.RepId
                     join obj2 in objContext.SubRepRole on obj1.SubRepId equals obj2.SubRepId
                     where roles.Contains(obj2.RoleId)
                     select new ReportTypeModel
                     {
                         RepId = obj.RepId,
                         RepName = obj.RepName,
                         RepCode = obj.RepCode
                     }).ToList();

现在它的工作正常。 @ NetMage的答案也有效......谢谢

LINQ查询WHERE IN clasue

2 个答案: