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Entity Framework Core: FromSqlInterpolated(). An item with the same key has already been added. Key: Id

I want to get a list of my friends' stories. It didn't work through LINQ, but I was able to write a good SQL query that really works and returns what I need. I use .NET 7 & EF Core 7.
int userId = 1;
StoryContainerRto test = await _context.StoryContainer
.FromSqlInterpolated($#"SELECT s."Id", s."AuthorId", u."Id", u."AccountHeaderUrl", u."AvatarUrl", u."Description", u."Email", u."IsAuthorOfQualityContent", u."IsDeleted", u."IsInShadowBan", u."IsVerifiedProfile", u."LinkInBio", u."MedalsAmount", u."Name", u."Nickname", u."PasswordHash", u."PasswordSalt", u."PhoneNumber", u."PhoneNumberPrefix", u."PhoneNumberVerefied", u."RegistrationDateTime", u."TelegramId", u."TelegramVerifyingChatId"
FROM ""StoryContainer"" as s
INNER JOIN ""StoryContentRefs"" as scr ON scr.""StoryId"" = s.""Id""
LEFT JOIN ""User"" as u ON u.""Id"" = s.""AuthorId""
LEFT JOIN ""StoryContentRefRtoUserRto"" as whoView ON whoView.""ViewedId"" = {userId} AND whoView.""ViewedStoriesId"" = scr.""Id""
WHERE s.""AuthorId"" IN (
SELECT u.""Id""
FROM ""UserFriend"" as f, ""User"" as u
WHERE
CASE
WHEN f.""FirstUserFriendId"" = {userId}
THEN f.""SecondUserFriendId"" = u.""Id""
WHEN f.""SecondUserFriendId"" = {userId}
THEN f.""FirstUserFriendId"" = u.""Id""
END
)
AND scr.""CreateTimestamp"" >= NOW() - '1 day'::INTERVAL
AND scr.""IsDelete"" = false").ToListAsync();
Output:
System.ArgumentException: An item with the same key has already been added. Key: Id
If you execute this code, the SQL query will be identical (given that the SQL query is lightweight. It just gets the story and the author, but does not get the rest of the information, because it is needed only for clarity)
StoryContainerRto entity = await _context.StoryContainer
.AsNoTracking()
.Include(e => e.Author)
.Where(e => e.AuthorId == 1)
.ToListAsync();
Generated SQL (note the duplication of the "Id" column):
SELECT s."Id", s."AuthorId", u."Id", u."AccountHeaderUrl", u."AvatarUrl", u."Description", u."Email", u."IsAuthorOfQualityContent", u."IsDeleted", u."IsInShadowBan", u."IsVerifiedProfile", u."LinkInBio", u."MedalsAmount", u."Name", u."Nickname", u."PasswordHash", u."PasswordSalt", u."PhoneNumber", u."PhoneNumberPrefix", u."PhoneNumberVerefied", u."RegistrationDateTime", u."TelegramId", u."TelegramVerifyingChatId"
FROM "StoryContainer" AS s
INNER JOIN "User" AS u ON s."AuthorId" = u."Id"
WHERE s."AuthorId" = 1
User table:
[Table("User")]
public class UserRto
{
[Key] public int Id { get; set; }
[Required] public string Nickname { get; set; }
public string? Email { get; set; }
[Required] public byte[] PasswordHash { get; set; }
[Required] public byte[] PasswordSalt { get; set; }
public string? Name { get; set; }
public string? Description { get; set; }
public string? LinkInBio { get; set; }
public int MedalsAmount { get; set; }
public string? AvatarUrl { get; set; }
public bool IsDeleted { get; set; }
public bool? IsVerifiedProfile { get; set; }
public bool? IsAuthorOfQualityContent { get; set; }
public bool IsInShadowBan { get; set; }
public DateTime RegistrationDateTime { get; set; }
public string? PhoneNumberPrefix { get; set; }
public string? PhoneNumber { get; set; }
public bool PhoneNumberVerefied { get; set; }
public string? TelegramId { get; set; }
public string? TelegramVerifyingChatId { get; set; }
public string? AccountHeaderUrl { get; set; }
public List<FriendInvitationRto> FriendInvitationsSent { get; set; }
public List<FriendInvitationRto> FriendInvitationsReceived { get; set; }
public List<UserFriendRto> FirstFriends { get; set; }
public List<UserFriendRto> SecondFriends { get; set; }
public List<StoryContentRefRto> ViewedStories { get; set; }
public StoryContainerRto StoryContainer { get; set; }
}
Story table:
[Table("StoryContainer")]
public class StoryContainerRto
{
public int Id { get; set; }
public int AuthorId { get; set; }
public UserRto Author { get; set; }
public List<StoryContentRefRto> Items { get; set; }
}
How do I complete the request? I understand that the fact is that 3 columns of "Id" come from three tables. But at the same time, if you look at the request generated by EF itself, then there are also 2 "Ids". How do I execute such a request correctly?
https://makolyte.com/ef-core-select-queries-involving-multiple-table/
There is an example of code using INNER JOIN like mine. I do not know why the same approach does not work for me
I also applied the AS operator to all the "Id" columns, but in that case I get this error:
The required column 'Id' was not present in the results of a 'FromSql' operation

I was able to solve this problem using a direct SQL query to the database, and then analyzed the information myself
List<StoryRto> friendsStories = new();
using (NpgsqlCommand command = (NpgsqlCommand)(_context as PotokContext)!.Database.GetDbConnection().CreateCommand())
{
command.CommandText = $#"SELECT s.*, scr.*, u.*, whoView.""ViewedId"" as ""IViewThis""
FROM ""Stories"" as s
INNER JOIN ""StoryContentRefs"" as scr ON scr.""StoryId"" = s.""Id""
INNER JOIN ""User"" as u ON u.""Id"" = s.""AuthorId""
LEFT JOIN ""StoryContentRefRtoUserRto"" as whoView ON whoView.""ViewedId"" = 1 AND whoView.""ViewedStoriesId"" = scr.""Id""
WHERE s.""AuthorId"" IN (
SELECT u.""Id""
FROM ""UserFriend"" as f, ""User"" as u
WHERE
CASE
WHEN f.""FirstUserFriendId"" = 1
THEN f.""SecondUserFriendId"" = u.""Id""
WHEN f.""SecondUserFriendId"" = 1
THEN f.""FirstUserFriendId"" = u.""Id""
END
)
AND scr.""CreateTimestamp"" >= NOW() - '1 day'::INTERVAL
AND scr.""IsDelete"" = false
LIMIT {count}
OFFSET {skipCount}";
(_context as PotokContext)!.Database.OpenConnection();
using (var reader = command.ExecuteReader())
{
if (reader.HasRows)
{
while (reader.Read())
{
// Stories table
int storyId = reader.GetInt32(0);
int authorId = reader.GetInt32(1);
// StoryContentRefs table
int scrId = reader.GetInt32(2);
int scrStoryId = reader.GetInt32(3);
string scrStoryContentRef = reader.GetString(4);
bool scrIsDelete = reader.GetBoolean(5);
DateTime scrCreateTimestamp = reader.GetDateTime(6);
// UserTable
int userId = reader.GetInt32(7);
string userNickname = reader.GetString(8);
string? userEmail = reader.IsDBNull(9) ? null : reader.GetString(9);
// password hash and salt will not be included
string? userName = reader.IsDBNull(12) ? null : reader.GetString(12);
string? userDescription = reader.IsDBNull(13) ? null : reader.GetString(13);
string? userLinkInBio = reader.IsDBNull(14) ? null : reader.GetString(14);
int userMedalsAmount = reader.GetInt32(15);
string? userAvatarUrl = reader.IsDBNull(16) ? null : reader.GetString(16);
bool userIsDeleted = reader.GetBoolean(17);
bool? userIsVerifiedProfile = reader.IsDBNull(18) ? null : reader.GetBoolean(18);
DateTime userRegistrationDateTime = reader.GetDateTime(19);
bool? userIsAuthorOfQualityContent = reader.IsDBNull(20) ? null : reader.GetBoolean(20);
string? userPhoneNumber = reader.IsDBNull(21) ? null : reader.GetString(21);
string? userPhoneNumberPrefix = reader.IsDBNull(22) ? null : reader.GetString(22);
bool userPhoneNumberVerified = reader.GetBoolean(23);
string? userTelegramId = reader.IsDBNull(24) ? null : reader.GetString(24);
string? userTelegramVerifyingChatId = reader.IsDBNull(25) ? null : reader.GetString(25);
bool userIsInShadowBan = reader.GetBoolean(26);
string? userAccountHeaderUrl = reader.IsDBNull(27) ? null : reader.GetString(27);
// WhoViewStory relation
int? iViewThis = reader.IsDBNull(28) ? null : reader.GetInt32(28);
UserRto user = new()
{
Id = userId,
Nickname = userNickname,
Email = userEmail,
Name = userName,
Description = userDescription,
LinkInBio = userLinkInBio,
MedalsAmount = userMedalsAmount,
AvatarUrl = userAvatarUrl,
IsDeleted = userIsDeleted,
IsVerifiedProfile = userIsVerifiedProfile,
RegistrationDateTime = userRegistrationDateTime,
IsAuthorOfQualityContent = userIsAuthorOfQualityContent,
PhoneNumber = userPhoneNumber,
PhoneNumberPrefix = userPhoneNumberPrefix,
PhoneNumberVerefied = userPhoneNumberVerified,
TelegramId = userTelegramId,
TelegramVerifyingChatId = userTelegramVerifyingChatId,
IsInShadowBan = userIsInShadowBan,
AccountHeaderUrl = userAccountHeaderUrl
};
List<UserRto> viewed = new();
if (iViewThis != null) viewed.Add(user);
StoryContentRefRto storyContentRef = new()
{
Id = scrId,
StoryId = scrStoryId,
ContentRefs = scrStoryContentRef,
IsDelete = scrIsDelete,
CreateTimestamp = scrCreateTimestamp,
Viewed = viewed
};
if (friendsStories.FirstOrDefault(e => e.Id == scrStoryId) == null)
{
// Create new
StoryRto story = new()
{
Id = storyId,
AuthorId = authorId,
Author = user,
Items = new() { storyContentRef }
};
friendsStories.Add(story);
}
else
{
// Add to existing
StoryRto story = friendsStories.First(e => e.Id == scrStoryId);
story.Items.Add(storyContentRef);
}
}
}
else
{
Console.WriteLine("No rows found.");
}
}
}

Filter data from 2 lists with diferent models C#

I have this models
public class RoutingAttributeModel
{
public int Bus_No { get; set; }
public int Attribute_No { get; set; }
public string Attribute_Name { get; set; }
public string Status { get; set; }
public string Notes { get; set; }
}
public class AgentRoutingAttributeModel
{
public int Agent_No { get; set; }
public int Bus_No { get; set; }
public int Attribute_No { get; set; }
public string Attribute_Name { get; set; }
public string Status { get; set; }
}
List<RoutingAttributeModel> lstComplete = new List<RoutingAttributeModel>();
List<AgentRoutingAttributeModel> lstAssigned = new List<AgentRoutingAttributeModel>();
Filled this with some data
Is it possible to filter with Linq? I want to save in a new list the diferent content between lstComplete and lstAssigned
I was trying to join both lists but got stuck there
var results1 = from cl in lstComplete
join al in lstAssigned
on cl.Attribute_No equals al.Attribute_No
select cl;

you can use linq
as my understanding, you try to find linked by attribute_No records and have a list of not matching properties?
lstComplete.Add(new RoutingAttributeModel(){
Attribute_Name = "aaa",
Attribute_No = 1,
Bus_No = 1,
Notes = "",
Status = "status"
});
lstAssigned.Add(new AgentRoutingAttributeModel()
{
Attribute_No = 1,
Agent_No = 10,
Bus_No = 1,
Attribute_Name = "bbb",
Status = "status2"
});
var lst = lstComplete
.Join(lstAssigned,
complete => complete.Attribute_No,
assigned => assigned.Attribute_No,
(complete, assigned) => new { lstComplete = complete, lstAssigned = assigned })
.Select(s => new { s.lstComplete, s.lstAssigned})
.Where(w=>
w.lstAssigned.Attribute_Name != w.lstComplete.Attribute_Name
|| w.lstAssigned.Bus_No != w.lstComplete.Bus_No
)
.ToList()
.Dump();
so result would be

You could try the following query
var filteredList = lstComplete
.Where(x => !lstAssigned.Any(y => y.Attribute_No == x.Attribute_No));

Add values to a list inside a list Linq

I am having a class like this.
public class CameraModel
{
public int JobId { get; set; }
public int ViewId { get; set; }
public Guid ViewGuid { get; set; }
public string Name { get; set; }
public int ViewNum { get; set; }
public int LayoutID { get; set; }
public List<CameraViewItemModel> CameraViewItems { get; set; }
}
The CameraViewItemModel class is like this:
public class CameraViewItemModel
{
public int JobID { get; set; }
public Guid ViewGuid { get; set; }
public int ViewID { get; set; }
public int CamNum { get; set; }
public Guid ChannelGuid { get; set; }
public string Name { get; set; }
public ActionType Action { get; set; }
}
Now, I am assigning the list of CameraViewItemModel like this:
// get all the cameramodel's
cameraModels = _unitOfWork.Context.CameraViews.Where(m => m.JobId == siteId)
.Select(m => new CameraModel
{
JobId = m.JobId,
ViewId = m.ViewId,
ViewGuid = m.ViewGuid,
Name = m.Name,
ViewNum = m.ViewNum,
LayoutID = m.LayoutId
}).ToList();
// get all the cameraviewitemmodels
cameraViewItemModels =
(from cameraView in _unitOfWork.Repository<CameraViews>().Get(x => x.JobId == siteId).Result
join cameraViewItem in _unitOfWork.Repository<CameraViewItems>().Get(x => x.JobId == siteId)
.Result on cameraView.ViewId equals cameraViewItem.ViewId into CameraViewItemResults
from cameraViewItemResult in CameraViewItemResults.DefaultIfEmpty()
join cameraChannel in _unitOfWork.Repository<CameraChannels>().Get(x => x.JobId == siteId)
.Result on (cameraViewItemResult == null ? new Guid() : cameraViewItemResult.ChannelGuid) equals cameraChannel.ChannelGuid into CameraChannelResults
from cameraChannelResult in CameraChannelResults.DefaultIfEmpty()
select new CameraViewItemModel
{
JobID = cameraView.JobId,
ViewID = cameraView.ViewId,
ViewGuid = cameraView.ViewGuid,
CamNum = cameraViewItemResult.CamNum,
ChannelGuid = cameraChannelResult.ChannelGuid,
Name = cameraChannelResult.Name
}).ToList();
// then do a 'join' on JobId, ViewId and ViewGuid and assign the list of cameraviewitemmodels to cameraModels.
foreach (var cameraModel in cameraModels)
{
cameraModel.CameraViewItems = (from cameraViewItem in cameraViewItemModels
where cameraModel.JobId == cameraViewItem.JobID
&& cameraModel.ViewId == cameraViewItem.ViewID
&& cameraModel.ViewGuid == cameraViewItem.ViewGuid
select cameraViewItem).ToList();
}
return cameraModels;
There are three tables in database:
CameraViews, CameraViewItems, CameraChannels.
CameraViews is the main table. It is left joined with CameraViewItems and CameraChannels to get the desired result. There may not be any data in CameraViewItems and CameraChannels for a corresponding CameraView.
Is it possible to assign the list of CameraViewItemModels to CameraModels in a single linq statement.

Here is a simple way to add values to a sub list, dunno if this is what you mean. You can keep selecting sub lists if that is necessary.
var parent_lst = new List<List<string>>(); // Root/parent list that contains the other lists
var sub_lst = new List<string>(); // Sub list with values
var selected_parent_lst = parent_lst[0]; // Here I select sub list, in this case by list index
selected_parent_lst.Add("My new value"); // And here I add the new value

Cannot implicitly convert type 'System.Collections.Generic.List<AnonymousType#1>' to 'System.Collections.Generic.List<FirstApp.Model.TeamDetails>

I am getting this error
Cannot implicitly convert type
System.Collections.Generic.List<AnonymousType#1> to
System.Collections.Generic.List<FirstApp.Model.TeamDetails>
What's wrong with my code?
Here is my code
TeamDetails Class
public class TeamDetails
{
[Key]
public int TeamId { get; set; }
public string TeamName { get; set; }
public string Description { get; set; }
public int? UserCount { get; set; }
}
ViewModel
public class ViewTeamList
{
public List<TeamDetails> TeamNext { get; set; }
}
Controller
public ActionResult Next(int dataid)
{
ViewTeamList viewTeamList = new ViewTeamList();
var a = from t in tDbContext.Teams
join u in tDbContext.Users on t.TeamId equals u.TeamId into g
where t.Deleted != true
select new { TeamId= t.TeamId,TeamName = t.TeamName, Description = t.Description, UserId = g.Count() };
var next = a.OrderBy(t1 => t1.TeamId).Where(t1 => t1.TeamId > dataid).FirstOrDefault();
viewTeamList.TeamNext = a.ToList();
return PartialView("_ViewTeamDetails", viewTeamList);
}
I'm not able to assign this value to
viewTeamList.TeamNext = a....;

This constructs an anonymous type instead of TeamDetails
select new { TeamId= t.TeamId,TeamName = t.TeamName, Description = t.Description, UserId = g.Count() }
You should change it to below
select new TeamDetails { TeamId = t.TeamId, TeamName = t.TeamName, Description = t.Description, UserCount = g.Count() }
so a.ToList() would be a List<FirstApp.Model.TeamDetails>

I need to select particular column based on check box list

I have a check box list in that user can check or uncheck the check box.
Based on the selected check box I used to store that value by comma separated. Now the problem is based on selected check box I need to get that particular column alone. in "select"**
db.Tasks.OrderBy(t => t.CreatedDate).ToList()
.Select(t => new {
Id = t.Id,
PriorityId = t.ProjectId,
Priority = t.Priority,
StatusId = t.StatusId,
Status = t.Status,
EstimatedTime = t.EstimatedTime,
ActualTime = t.ActualTime,
Subject = t.Subject,
FileName = t.FileName,
AssignedTo = t.AssignedTo,
Project = t.Project
}).ToList();
if i select in check box list ActualTime, Subject, it should be like
db.Tasks.OrderBy(t => t.CreatedDate).ToList()
.Select(t => new {
Id = t.Id,
ActualTime = t.ActualTime,
Subject = t.Subject
}).ToList();
if i select in check box list Subject, FileName, AssignedTo, it should be like
db.Tasks.OrderBy(t => t.CreatedDate).ToList()
.Select(t => new {
Id = t.Id,
Subject = t.Subject,
FileName = t.FileName,
AssignedTo = t.AssignedTo
}).ToList();
the select will be dynamic based on selected check box list.

add DynamicLibrary.cs to your project.
You can get it from this link . It's a zip file that contains the dynamic link source. It's not a dll.
Originally posted on ScottGu's blog here.
for reference see this stack overflow link .
using System.Linq.Dynamic;
public class DynamicColumns : BaseEntity
{
public string User { get; set; }
public string TaskId { get; set; }
public string Project { get; set; }
public string Priority { get; set; }
public string TaskType { get; set; }
public string Version { get; set; }
public string Module { get; set; }
public string Subject { get; set; }
public string Details { get; set; }
public string FileName { get; set; }
public string Status { get; set; }
public string AssignedBy { get; set; }
public string AssignedTo { get; set; }
public int ActualTime { get; set; }
public int LogWork { get; set; }
public DateTime CreatedDate { get; set; }
public DateTime AssignedDate { get; set; }
public DateTime ResolveDate { get; set; }
public int EstimatedTime { get; set; }
}
public enum EnumTasks
{
User = 1,
Project = 2,
Priority = 3,
TaskType = 4,
Version = 5,
Module = 6,
Subject = 7,
Details = 8,
Status = 9,
Assigned_By = 10,
Assigned_To = 11,
Created_Date = 12,
Assigned_Date = 13,
Resolve_Date = 14,
Estimated_Time = 15,
Actual_Time = 16,
LogWork = 17
}
public IQueryable DynamicSelectionColumns()
{
using (var db = new TrackerDataContext())
{
string fieldIds = "," + "4,5,3,2,6,17,11,12" + ",";
var taskColum = Enum.GetValues(typeof(EnumTasks)).Cast<EnumTasks>().Where(e => fieldIds.Contains("," + ((int)e).ToString() + ",")).Select(e => e.ToString().Replace("_", ""));
string select = "new ( TaskId, " + (taskColum.Count() > 0 ? string.Join(", ", taskColum) + ", " : "") + "Id )";
return db.Task.ToList().Select(t => new DynamicColumns() { Id = t.Id, TaskId = Project != null ? Project.Alias + "-" + t.Id : t.Id.ToString(), ActualTime = t.ActualTime, AssignedBy = t.AssignedBy.ToString(), AssignedDate = t.AssignedDate, AssignedTo = t.AssignedTo.ToString(), CreatedDate = t.CreatedDate, Details = t.Details, EstimatedTime = t.EstimatedTime, FileName = t.FileName, LogWork = t.LogWork, Module = t.Module != null ? t.Module.Name : "", Priority = t.Priority != null ? t.Priority.Name : "", Project = t.Project != null ? t.Project.Name : "", ResolveDate = t.ResolveDate, Status = t.Status != null ? t.Status.Name : "", Subject = t.Subject, TaskType = t.TaskType != null ? t.TaskType.Type : "", Version = t.Version != null ? t.Version.Name : "" }).ToList().AsQueryable().Select(select);
}
}