I try make table where i keep children-parent data. Ofc root of parents is "0" and here in table can by many roots. When i try make this work i got error.
Unable to create a constant value of type 'Projekty03.ViewsModels.ParagrafViewModel'. Only primitive types ('such as Int32, String, and Guid') are supported in this context.
public ViewResult Index()
{
List<ParagrafViewModel> _paragrafparent = new List<ParagrafViewModel>();
_paragrafparent.Add(new ParagrafViewModel { ParagrafID = 0, ParagrafNazwa = "Root" });
var _paragrafparent2 = from pr in paragrafRepository.All
orderby pr.ParagrafID
select new ParagrafViewModel
{
ParagrafID = pr.ParagrafID,
ParagrafNazwa = pr.ParagrafNazwa
};
var _paragrafparent3 = _paragrafparent.Concat(_paragrafparent2).AsEnumerable();
var paragraf = from par in paragrafRepository.All
join rodzic_p in _paragrafparent3
on par.ParagrafParent equals rodzic_p.ParagrafID
orderby par.ParagrafParent, par.ParagrafID
select new ParagrafViewModel
{
ParagrafID = par.ParagrafID,
ParagrafNazwa = par.ParagrafNazwa,
ParagrafParent = par.ParagrafParent,
ParagrafCzynny = par.ParagrafCzynny,
ParagrafWplyw = par.ParagrafWplyw,
ParagrafParentNazwa = rodzic_p.ParagrafNazwa
};
return View(paragraf);
}
I believe is sht wrong with my poor magic LINQ think. How resolve this ?
Ok here is a answer for my own question. Im sure is not a pretty solution but ...
public ViewResult Index()
{
List<ParagrafViewModel> _paragrafparent = new List<ParagrafViewModel>();
_paragrafparent.Add(new ParagrafViewModel { ParagrafID = 0, ParagrafNazwa = "Root", ParagrafCzynny=false, });
var _paragrafparent2 = from pr in paragrafRepository.AllIncluding(paragraf => paragraf.WniosekPodzial)
orderby pr.ParagrafID
select new ParagrafViewModel
{
ParagrafID = pr.ParagrafID,
ParagrafNazwa = pr.ParagrafNazwa,
ParagrafParent = pr.ParagrafParent,
ParagrafCzynny = pr.ParagrafCzynny,
ParagrafWplyw = pr.ParagrafWplyw,
WniosekPodzialNazwa = pr.WniosekPodzial.WniosekPodzialNazwa
};
var _paragrafparent3 = _paragrafparent.Concat(_paragrafparent2).AsEnumerable();
var paragrafModel = from par in _paragrafparent3
join rodzic_p in _paragrafparent3
on par.ParagrafParent equals rodzic_p.ParagrafID
orderby par.ParagrafParent, par.ParagrafID
select new ParagrafViewModel
{
ParagrafID = par.ParagrafID,
ParagrafNazwa = par.ParagrafNazwa,
ParagrafParent = par.ParagrafParent,
ParagrafCzynny = par.ParagrafCzynny,
ParagrafWplyw = par.ParagrafWplyw,
ParagrafParentNazwa = rodzic_p.ParagrafNazwa,
WniosekPodzialNazwa = par.WniosekPodzialNazwa
};
return View(paragrafModel);
}
Related
Hi I am changing career to computer programming. I am still in college. I have to change the following LINQ query from method syntax to query syntax. What gets me is the 2 steps process of the method query. First it gets a teamId and then it returns a list based on the context and using the teamId. I am confused about how to translate this to query method. Most of the questions are about going from query syntax to method.
Can someone Help?
public IEnumerable<TemplateView> GetTemplates(Guid userId, int languageId)
{
using (DigigateEntities context = new Models.DigigateEntities())
{
var teamId = context
.TeamMembers
.Include("Team")
.FirstOrDefault(c => c.UserId == userId)
.Team.Id;
return context
.TeamTemplates.Include("Template")
.Where(c => c.TeamId == teamId)
.Select(c => c.Template)
.Where(c => c.StatusId == 1/*Active*/)
.Select(k => new TemplateView
{
TemplateName = k.Name,
Id = k.Id,
IsCustom = k.Custom,
TypeId = k.TypeId,
TypeName = k.TemplateType.Description,
FileName = k.FileName,
TemplateImage = "test.png",
LanguageId = k.LanguageId,
LanguageName = k.Language.Name,
CreateDate = k.CreateDate
}).ToList();
}
}
The first one is pretty straight forward. I delayed the execution of the query until the end. Since you may get a null reference exception in your example accessing .FirstOrDefault().Team.Id;
var teamId = (from c in context.TeamMembers.Include("Team")
where c.UserId == userId
select c.Team.Id).FirstOrDefault();
This one you just need to use an into in order to continue your query statement
return (from c in context.TeamTemplates.Include("Template")
where c.TeamId == teamId
select c.Template into k
where k.StatusId == 1
select new TemplateView
{
TemplateName = k.Name,
Id = k.Id,
IsCustom = k.Custom,
TypeId = k.TypeId,
TypeName = k.TemplateType.Description,
FileName = k.FileName,
TemplateImage = "test.png",
LanguageId = k.LanguageId,
LanguageName = k.Language.Name,
CreateDate = k.CreateDate
}).ToList();
public IEnumerable<TemplateView> GetTemplates(Guid userId, int languageId)
{
using (DigigateEntities context = new Models.DigigateEntities())
{
var teamId = (from tm in context.TeamMembers.Include("Team")
where tm.UserId==userId
select tm.Id).FirstOrDefault();
IEnumerable<TemplateView> result = from k in (from tmp in context.TeamTemplates.Include("Template")
select tmp.Template)
where k.StatusId==1
select new
{
TemplateName = k.Name,
Id = k.Id,
IsCustom = k.Custom,
TypeId = k.TypeId,
TypeName = k.TemplateType.Description,
FileName = k.FileName,
TemplateImage = "test.png",
LanguageId = k.LanguageId,
LanguageName = k.Language.Name,
CreateDate = k.CreateDate
};
return result;
}
what is the correct syntax to write the second list? bookid and other fields are not recognizing
var bookssublist = from bookdetails in bookslist
join bookcategories in _context.BookCategories
on bookdetails.BookId equals bookcategories.BookId
where bookcategories.CategoryId==CategoryId
select new BookBasicInfo {
count = bookcount,
BookInfo = new List<BookInfo>()
{
BookId = bookdetails.BookId,
BookTitle = bookdetails.Title,
Images = bookdetails.ThumbnailImagePath,
PublishDate = bookdetails.PublishedDate,
AuthorList = bookdetails.BookAuthors.Select(q => q.Author.Author1).ToList(),
CategoryList =bookdetails.BookCategories.Select(q=>q.Category.CategoryName).ToList(),
}
};
You are using collection initializer in a wrong way. Actually, you forgot to pass an object of type BookInfo to the initializer.
BookInfo = new List<BookInfo>()
{
new BookInfo()
{
BookId = bookdetails.BookId,
BookTitle = bookdetails.Title,
Images = bookdetails.ThumbnailImagePath,
PublishDate = bookdetails.PublishedDate,
AuthorList = bookdetails.BookAuthors.Select(q => q.Author.Author1).ToList(),
CategoryList =bookdetails.BookCategories.Select(q=>q.Category.CategoryName).ToList()
}
}
I have 2 objects (lists loaded from XML) report and database (showed bellow in code) and i should analyse them and mark items with 0, 1, 2, 3 according to some conditions
TransactionResultCode = 0; // SUCCESS (all fields are equivalents: [Id, AccountNumber, Date, Amount])
TransactionResultCode = 1; // Exists in report but Not in database
TransactionResultCode = 2; // Exists in database but Not in report
TransactionResultCode = 3; // Field [Id] are equals but other fields [AccountNumber, Date, Amount] are different.
I'll be happy if somebody could found time to suggest how to optimize some queries.
Bellow is the code:
THANK YOU!!!
//TransactionResultCode = 0 - SUCCESS
//JOIN on all fields
var result0 = from d in database
from r in report
where (d.TransactionId == r.MovementID) &&
(d.TransactionAccountNumber == long.Parse(r.AccountNumber)) &&
(d.TransactionDate == r.MovementDate) &&
(d.TransactionAmount == r.Amount)
orderby d.TransactionId
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount,
TransactionResultCode = 0
};
//*******************************************
//JOIN on [Id] field
var joinedList = from d in database
from r in report
where d.TransactionId == r.MovementID
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount
};
//Difference report - database
var onlyReportID = report.Select(r => r.MovementID).Except(joinedList.Select(d => d.TransactionId));
//TransactionResultCode = 1 - Not Found in database
var result1 = from o in onlyReportID
from r in report
where (o == r.MovementID)
orderby r.MovementID
select new TransactionList()
{
TransactionId = r.MovementID,
TransactionAccountNumber = long.Parse(r.AccountNumber),
TransactionDate = r.MovementDate,
TransactionAmount = r.Amount,
TransactionResultCode = 1
};
//*******************************************
//Difference database - report
var onlyDatabaseID = database.Select(d => d.TransactionId).Except(joinedList.Select(d => d.TransactionId));
//TransactionResultCode = 2 - Not Found in report
var result2 = from o in onlyDatabaseID
from d in database
where (o == d.TransactionId)
orderby d.TransactionId
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount,
TransactionResultCode = 2
};
//*******************************************
var qwe = joinedList.Select(j => j.TransactionId).Except(result0.Select(r => r.TransactionId));
//TransactionResultCode = 3 - Transaction Results are different (Amount, AccountNumber, Date, )
var result3 = from j in joinedList
from q in qwe
where j.TransactionId == q
select new TransactionList()
{
TransactionId = j.TransactionId,
TransactionAccountNumber = j.TransactionAccountNumber,
TransactionDate = j.TransactionDate,
TransactionAmount = j.TransactionAmount,
TransactionResultCode = 3
};
you may try something like below:
public void Test()
{
var report = new[] {new Item(1, "foo", "boo"), new Item(2, "foo2", "boo2"), new Item(3, "foo3", "boo3")};
var dataBase = new[] {new Item(1, "foo", "boo"), new Item(2, "foo22", "boo2"), new Item(4, "txt", "rt")};
Func<Item, bool> inBothLists = (i) => report.Contains(i) && dataBase.Contains(i);
Func<IEnumerable<Item>, Item, bool> containsWithID = (e, i) => e.Select(_ => _.ID).Contains(i.ID);
Func<Item, int> getCode = i =>
{
if (inBothLists(i))
{
return 0;
}
if(containsWithID(report, i) && containsWithID(dataBase, i))
{
return 3;
}
if (report.Contains(i))
{
return 2;
}
else return 1;
};
var result = (from item in dataBase.Union(report) select new {Code = getCode(item), Item = item}).Distinct();
}
public class Item
{
// You need also to override Equals() and GetHashCode().. I omitted them to save space
public Item(int id, string text1, string text2)
{
ID = id;
Text1 = text1;
Text2 = text2;
}
public int ID { get; set; }
public string Text1 { get; set; }
public string Text2 { get; set; }
}
Note that you need to either implement Equals() for you items, or implement an IEqualityComparer<> and feed it to Contains() methods.
Here is the code snippet, actually the whole method. This method works f,ine when NULLAblE Foreign Key Refernces has value. When the value is not there, then this method does not work. My idea is to get all the records even if the references column is NULL. Here is the code :
public List<PostedJob> GetPostedJobs(int startingIndex, int maximumRows)
{
using (var records = new CommonEvent())
{
var resultSet =
from r in records.ProjectPosts
join rr in records.Categories on r.Category_FK equals rr.ID
join al in records.ApplyForLimits on r.ApplyForLimit_FK
equals al.Id
//from uImage in
// records.UploadedFiles
// .Where(uu=>uu.Id == r.UploadedFileInfo_FK
// || r.UploadedFileInfo_FK == null).DefaultIfEmpty()
join a in records.UploadedFiles on r.UploadedFileInfo_FK
equals a.Id into something
from uImage in something.DefaultIfEmpty()
orderby r.PostId
select new Models.PostedJob
{
ApplyForLimitName = al.Name,
ProjectTitle = r.ProjectTitle,
ProjectDescription = r.ProjectDescription,
ProjectSummaryDescription = r.ProjectSummaryDescription,
SkillsRequirements = r.SkillsRequirements,
CategoryName = rr.CategoryName,
UploadedFileID = (int) r.UploadedFileInfo_FK,
UploadedFileInformation = uImage == null ?
new Models.UploadedFile
{
fileContents = new byte [] { (byte) 0},
FileExtension = string.Empty,
FileName = string.Empty,
FileSize = 0,
UploadedDate = DateTime.Now
}
:
new Models.UploadedFile
{
fileContents = uImage.FileContents,
FileExtension = uImage.FileExtension,
FileName = uImage.FileName,
FileSize = uImage.FileSize,
UploadedDate = DateTime.Now
}
};
return resultSet.Skip(startingIndex).Take(maximumRows).ToList();
}
Thank you for any suggestions or ideas on how to proceed . I am using .NET 4.0
Can you not use the Associations generated for you?
var a = records
.ProjectPosts
.Select(
projectPost =>
new Models.PostedJob()
{
ProjectTitle = projectPost.ProjectTitle,
CategoryName = projectPost.Category.CategoryName,
});
Something along those lines?
EDIT: And just add Null checks when the FK may fail
example:
CategoryName = projectPost.Category == null ? String.Empty : projectPost.Category.CategoryName,
Very primitive question but I am stuck (I guess being newbie). I have a function which is supposed to send me the list of companies : ALSO, I want the caller to be able to specify a top element for the drop-down list as well.. (say for "None"). I have following piece of code, how I will append the Top Element with the returning SelectList?
public static SelectList GetCompanies( bool onlyApproved, FCCIEntityDataContext entityDataContext, SelectListItem TopElement )
{
var cs = from c in entityDataContext.Corporates
where ( c.Approved == onlyApproved || onlyApproved == false )
select new
{
c.Id,
c.Company
};
return new SelectList( cs.AsEnumerable(), "Id", "Comapny" );
}
Thanks!
This should work for you:
List<Corporate> corporates =
(from c in entityDataContext.Corporates
where (c.Approved == onlyApproved || onlyApproved == false)
select c).ToList();
corporates.Add(new Corporate { Id = -1, Company = "None" });
return new SelectList(corporates.AsEnumerable(), "Id", "Comapny");
This method has always worked for me.
public static SelectList GetCompanies( bool onlyApproved, FCCIEntityDataContext entityDataContext, SelectListItem TopElement )
{
var cs = from c in entityDataContext.Corporates
where ( c.Approved == onlyApproved || onlyApproved == false )
select new SelectListItem {
Value = c.Id,
Text = c.Company
};
var list = cs.ToList();
list.Insert(0, TopElement);
var selectList = new SelectList( list, "Value", "Text" );
selectList.SelectedValue = TopElement.Value;
return selectList;
}
Update forgot the lesson I learned when I did this. You have to output the LINQ as SelectListItem.
cs.ToList().Insert(0, new { TopElement.ID, TopElement.Company });
You could convert it to a list as indicated or you could union the IQueryable result with a constant array of one element (and even sort it):
static void Main(string[] args)
{
var sampleData = new[] {
new { Id = 1, Company = "Acme", Approved = true },
new { Id = 2, Company = "Blah", Approved = true }
};
bool onlyApproved = true;
var cs = from c in sampleData
where (c.Approved == onlyApproved || onlyApproved == false)
select new
{
c.Id,
c.Company
};
cs = cs.Union(new [] {new { Id = -1, Company = "None" }}).OrderBy(c => c.Id);
foreach (var c in cs)
{
Console.WriteLine(String.Format("Id = {0}; Company = {1}", c.Id, c.Company));
}
Console.ReadKey();
}