I can't figure out how to do the second part of this (the for/foreach) with a LINQ expressions and haven't found any similar examples with LINQ. rangeDays will be between about 5 and 200, and q1 is a list of MyClasses where RowID is about from 10000 to 25000, without gaps.
public class MyClass { public int RowID; public object otherData; }
PopulateRange(int rangeDays, List<MyClass> q1){
var q2 = (from a in q1
let Rows = new int[rangeDays]
select new {a.RowID, Rows }).ToList();
foreach(var a in q2)
{
for(int i = 0; i < rangeDays; i++)
{
a.Rows[i] = a.RowID + i;
}
}
Thanks in advance.
Update:
I got this running with 2 linq statements as shown below (hopefully this is all runnable this time).
public List<MyClass> PopulateRange(int rangeDays, IQueryable<TheirClass> q1)
{
var q2 = (from a in q1
select new MyClass()
{ RowID = a.RowID, Rows = new int[rangeDays] }).ToList();
q2.ForEach(a => a.Rows = Enumerable.Range(0, rangeDays).
Select(i => i + a.RowID).ToArray());
return q2;
}
public class MyClass
{
public int RowID;
public int[] Rows;
}
public class TheirClass
{
public int RowID;
public int ID;
public string Symb;
public DateTime? EventTime;
public decimal? Value;
}
This is acceptable, but does anyone know why the following single statement throws a NotSupportedException "Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator." when I try to compile & run:
public List<MyClass> PopulateRange(int rangeDays, IQueryable<TheirClass> q1)
{
var q2 = (from a in q1
select new MyClass()
{ RowID = a.RowID, Rows = Enumerable.Range(0, rangeDays).
Select(i => i + a.RowID).ToArray() }).ToList();
return q2;
}
A slight variation on Ani's answer:
var q2 = q1.Select(a => new { Rows = Enumerable.Range(a.RowID, rangeDays)
.ToArray(),
RowID = a.RowID });
Differences:
When there's just a single select, I don't bother with query expression syntax
Rather than using Range from 0 and then Select, I figured it would be easier to just start off at a.RowID :)
I think q1's type should actually be List<MyRowClass> or similar (it certainly can't be a List<int>).
You probably want:
var q2 = (from a in q1
select new
{
a.RowID,
Rows = Enumerable.Range(0, rangeDays)
.Select(i => i + a.RowID)
.ToArray()
}).ToList();
Related
I use Entity Framework Core 2.1.
I have a scalar function in the database which adds specified number of days.
I created an extension method to execute it:
public static class AdventureWorks2012ContextExt
{
public static DateTime? ExecFn_AddDayPeriod(this AdventureWorks2012Context db, DateTime dateTime, int days, string periodName)
{
var sql = $"set #result = dbo.[fn_AddDayPeriod]('{dateTime.ToString("yyyy-MM-dd HH:mm:ss.fff")}', {days}, '{periodName}')";
var output = new SqlParameter { ParameterName = #"result", DbType = DbType.DateTime, Size = 16, Direction = ParameterDirection.Output };
var result = db.Database.ExecuteSqlCommand(sql, output);
return output.Value as DateTime?;
}
}
I try to use a scalar function in the query (to simplify things I use AdventureWorks2012) as follows:
var persons =
(from p in db.Person
join pa in db.Address on p.BusinessEntityId equals pa.AddressId
where p.ModifiedDate > db.ExecFn_AddDayPeriod(pa.ModifiedDate, 100, "DayPeriod_day")
select p).ToList();
But get an System.InvalidOperationException: 'A second operation started on this context before a previous operation completed. Any instance members are not guaranteed to be thread safe.'
How can I achieve this?
UPDATE:
I managed to do it with the help of Ivan's answer:
var persons =
(from p in db.Person
join bea in db.BusinessEntityAddress on p.BusinessEntityId equals bea.BusinessEntityId
join a in db.Address on bea.AddressId equals a.AddressId
where p.ModifiedDate > AdventureWorks2012ContextFunctions.AddDayPeriod(a.ModifiedDate, 100, "DayPeriod_day")
select p).ToList();
But now I need to update ModifiedDate for filtered persons. So I'm doing like this:
var persons =
(from p in db.Person
join bea in db.BusinessEntityAddress on p.BusinessEntityId equals bea.BusinessEntityId
join a in db.Address on bea.AddressId equals a.AddressId
let date = AdventureWorks2012ContextFunctions.AddDayPeriod(a.ModifiedDate, 100, "DayPeriod_day")
where p.ModifiedDate > date
select new { Person = p, NewDate = date }).ToList();
foreach (var p in persons)
p.Person.ModifiedDate = p.NewDate ?? DateTime.Now;
db.SaveChanges();
But got System.NotSupportedException: 'Specified method is not supported.'
How can I use scalar function in select statement?
I tried to split the query by two parts:
var filteredPersons = // ok
(from p in db.Person
join bea in db.BusinessEntityAddress on p.BusinessEntityId equals bea.BusinessEntityId
join a in db.Address on bea.AddressId equals a.AddressId
where p.ModifiedDate > AdventureWorks2012ContextFunctions.AddDayPeriod(a.ModifiedDate, 100, "DayPeriod_day")
select new { Person = p, a.ModifiedDate }).ToList();
var persons = // here an exception occurs
(from p in filteredPersons
select new { Person = p, NewDate = AdventureWorks2012ContextFunctions.AddDayPeriod(p.ModifiedDate, 100, "DayPeriod_day") }).ToList();
Instead of invoking the function client side (which is this particular case happens as part of the client evaluation of the query filter, while the query reading is still in progress), you can use EF Core Database scalar function mapping so it
can be used in LINQ queries and translated to SQL.
One way to do that is to create a public static method in the derived context class and mark it with DbFunction attribute:
public partial class AdventureWorks2012Context
{
[DbFunction("fn_AddDayPeriod")]
public static DateTime? AddDayPeriod(DateTime dateTime, int days, string periodName) => throw new NotSupportedException();
}
and use
where p.ModifiedDate > AdventureWorks2012Context.AddDayPeriod(pa.ModifiedDate, 100, "DayPeriod_day")
Another way is to create a public static method in another class
public static class AdventureWorks2012DbFunctions
{
[DbFunction("fn_AddDayPeriod")]
public static DateTime? AddDayPeriod(DateTime dateTime, int days, string periodName) => throw new NotSupportedException();
}
but then you'll need to register it with fluent API (which happens automatically for methods defined inside the context derived class):
modelBuilder
.HasDbFunction(() => AdventureWorks2012DbFunctions.AddDayPeriod(default(DateTime), default(int), default(string)));
The usage is the same:
where p.ModifiedDate > AdventureWorksDbFunctions.AddDayPeriod(pa.ModifiedDate, 100, "DayPeriod_day")
I am trying to get a record from database using linq but it keep return no record
it is very basic sql statment
select * where productid ='12553'
however the following code does not return any result. Please advise. thx you
private static IEnumerable<ProductModel> GetAllProduct(string productId)
{
using (var dc = new TestEntities())
{
var result = (from a in dc.Products
where a.productid == productId
select new ProductModel
{
ProductId = a.productid,
Name = a.ProductName
});
return result.Distinct().ToList();
}
}
You don't need projection here:
using (var dc = new TestEntities())
{
var result = from a in dc.Products
where a.productid == productId
select a;
return result.Distinct().ToList();
}
I am having trouble to return an IEnumerable and IList, I cant do it!
I am using EF 4 with POCOs
Here's the whole method:
//public IList<Genre> GetGenresByGame(int gameId)
public IEnumerable<Genre> GetGenresByGame(int gameId)
{
using(var ctx = new XContext())
{
var results =
from t0 in ctx.GameGenres
join t1 in ctx.GenreCultureDetails on t0.GenreId equals t1.GenreId
where t0.GameId == gameId && t1.CultureId == _cultureId
select new Genre
{
GenreId = t0.GenreId,
GenreName = t1.GenreName
};
return results.ToList();
}
}
I have tried different ways that I have found on the net.. but can't make it work!
Question 2:
I saw a screencast with Julie something, saying that "You should always return an ICollection" when using EF4.
Any thoughts about that ?
BR
EDIT:
When I load the page in Debug-mode i get these errors: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. OR The entity or complex type 'XModel.Genre' cannot be constructed in a LINQ to Entities query.
Genre must not be a L2EF type. Try this:
public IEnumerable<Genre> GetGenresByGame(int gameId)
{
using(var ctx = new XContext())
{
var resultList =
from t0 in ctx.GameGenres
join t1 in ctx.GenreCultureDetails on t0.GenreId equals t1.GenreId
where t0.GameId == gameId && t1.CultureId == _cultureId
select new { t0.GenreId, t1.GenreName };
var genres = resultList.AsEnumerable().Select(o => new Genre
{
GenreId = o.GenreId,
GenreName = o.GenreName
});
return genres.ToList();
}
}
First an foremost if Genre is in the database you should select it? If you have FKs from Genre->GenreCultureDetails let me know and I can update the below, but from the looks of it you could do it like this:
using(var ctx = new XContext())
{
var results =
from g in ctx.Genre
join gcd in ctx.GenreCultureDetails on g.GenreId equals gcd.GenreId
where g.GameId == gameId && gcd.CultureId == _cultureId
select g;
return result.ToList();
}
Alternatively continue down your path select them into an annoynmous type, and then copy them. You can use select instead of convertall if you please.
IList<Genre> returnMe = Null;
using(var ctx = new XContext())
{
var results =
from t0 in ctx.GameGenres
join t1 in ctx.GenreCultureDetails on t0.GenreId equals t1.GenreId
where t0.GameId == gameId && t1.CultureId == _cultureId
select new
{
GenreId = t0.GenreId,
GenreName = t1.GenreName
};
returnMe = results.ToList().ConvertAll(x=>new Genre(){
GenreId = x.GenreId,
GenreName = x.GenreName
}
);
}
return returnMe;
The scenario is like this:
name | val
'aa' | 10
'bb' | 20
'cc' | 30
*********
sum | 60
For now I just select all the records in simple LINQ query and invoke the enumerator (ToList())
Then I loop over the list and summarize the val column.
Is there a better way? LINQ selects all to a new typed object so I dont know how to add the additional data.
thanks.
Anonymous type cant allow value to be added or edited once its created. so instead of returning anonymous type, you can use your custom output class. Something like this
public class ResClass
{
public string name;
public int value;
}
public class OutClass
{
public int sum;
public List<ResClass> lstData;
}
int sum=0;
var outtt = objTT.Where(x => x.id == 1).Select(x =>
{
sum += x.value;
return new ResClass { name = x.name, value= x.value };
}).ToList();
OutClass outCls = new OutClass { sum = sum, lstData = outtt };
How can I project the row number onto the linq query result set.
Instead of say:
field1, field2, field3
field1, field2, field3
I would like:
1, field1, field2, field3
2, field1, field2, field3
Here is my attempt at this:
public List<ScoreWithRank> GetHighScoresWithRank(string gameId, int count)
{
Guid guid = new Guid(gameId);
using (PPGEntities entities = new PPGEntities())
{
int i = 1;
var query = from s in entities.Scores
where s.Game.Id == guid
orderby s.PlayerScore descending
select new ScoreWithRank()
{
Rank=i++,
PlayerName = s.PlayerName,
PlayerScore = s.PlayerScore
};
return query.ToList<ScoreWithRank>();
}
}
Unfortunately, the "Rank=i++" line throws the following compile-time exception:
"An expression tree may not contain an assignment operator"
Well, the easiest way would be to do it at the client side rather than the database side, and use the overload of Select which provides an index as well:
public List<ScoreWithRank> GetHighScoresWithRank(string gameId, int count)
{
Guid guid = new Guid(gameId);
using (PPGEntities entities = new PPGEntities())
{
var query = from s in entities.Scores
where s.Game.Id == guid
orderby s.PlayerScore descending
select new
{
PlayerName = s.PlayerName,
PlayerScore = s.PlayerScore
};
return query.AsEnumerable() // Client-side from here on
.Select((player, index) => new ScoreWithRank()
{
PlayerName = player.PlayerName,
PlayerScore = player.PlayerScore,
Rank = index + 1;
})
.ToList();
}
}
Ok, that did the trick. Thanks.
Here is my final code...
Server:
public List<Score> GetHighScores(string gameId, int count)
{
Guid guid = new Guid(gameId);
using (PPGEntities entities = new PPGEntities())
{
var query = from s in entities.Scores
where s.Game.Id == guid
orderby s.PlayerScore descending
select s;
return query.ToList<Score>();
}
}
Client:
void hsc_LoadHighScoreCompleted(object sender, GetHighScoreCompletedEventArgs e)
{
ObservableCollection<Score> list = e.Result;
_listBox.ItemsSource = list.Select((player, index) => new ScoreWithRank()
{
PlayerName = player.PlayerName,
PlayerScore = player.PlayerScore,
Rank = index+=1
}).ToList();
}
You could also make just a slight adjustment to your original code to get it working. Word of caution, if you databind or access the object again, the Rank will increment each time. In those cases the top answer is better.
let Rank = i++
and
Rank.ToString()
Full code:
public List<ScoreWithRank> GetHighScoresWithRank(string gameId, int count)
{
Guid guid = new Guid(gameId);
using (PPGEntities entities = new PPGEntities())
{
int i = 1;
var query = from s in entities.Scores
let Rank = i++
where s.Game.Id == guid
orderby s.PlayerScore descending
select new ScoreWithRank()
{
Rank.ToString(),
PlayerName = s.PlayerName,
PlayerScore = s.PlayerScore
};
return query.ToList<ScoreWithRank>();
}
}
This solution worked for me.
http://www.dotnetfunda.com/articles/article1995-rownumber-simulation-in-linq.aspx
.Select((x, index) => new
{
SequentialNumber = index + 1
,FieldFoo = x.FieldFoo
}).ToList();
List<Emp> Lstemp = GetEmpList();
int Srno = 0;
var columns = from t in Lstemp
orderby t.Name
select new {
Row_number=++Srno,
EmpID = t.ID,
Name = t.Name,
City = t.City
};