I have these classes:
public class product
{
public int Id { get; set; }
public string Title { get; set; }
public Store Store { get; set; }
public ICollection<Color> Colors { get; set; }
}
public class Color
{
public int Id { get; set; }
public string Name { get; set; }
public product Product { get; set; }
}
public class Store
{
public int Id { get; set; }
public string Name { get; set; }
public string City { get; set; }
public ICollection<product> Products { get; set; }
}
And I have this list :
List<Store> Stores = new List<Store>
{
new Store { Id = 1, Name = "Lilo", City = "Teh",
Products = new List<product>
{
new product
{ Id = 1, Title = "Asus",
Colors = new List<Color> {
new Color { Id = 1, Name = "Blue"},
new Color { Id = 2, Name = "Orange"}
}
},
new product
{ Id = 2, Title = "Dell",
Colors = new List<Color> {
new Color { Id = 1, Name = "Yellow"},
new Color { Id = 2, Name = "Orange"},
new Color { Id = 3, Name = "Red"}
}
}
}
},
new Store{Id=2,Name="filo",City="san",
Products=new List<product>
{
new product{Id=3,Title="Asus",
Colors=new List<Color>{
new Color{Id=1,Name="Blue"},
new Color{Id=2,Name="Orange"}
}
},
new product{Id=4,Title="Dell",
Colors=new List<Color>{
new Color{Id=1,Name="Yellow"},
new Color{Id=2,Name="Lime"},
new Color{Id=3,Name="Red"}
}
}
}
}
};
I want to select all stores where Name ="Lilo" and products names is "Dell " and Color="Blue". I want do this in Entity Framework, not Linq.
I use this code but it doesn't work :
var test = Stores.Where(s => s.Name = "lilo" && s.Products.Where(p => p.Title == "Dell").FirstOrDefault().Title == "Dell" && s.Products.Where(c => c.Colors.Where(ct => ct.Name == "Blue").FirstOrDefault().Name = "Blue")).ToList();
How can I do this ?
Do this By Method Syntax :
var stlist = Stores.Where(s => s.Name.ToLower() == "lilo" && s.Products.Where(p => p.Colors.Any(c=>c.Name=="Blue") && p.Title == "Dell").FirstOrDefault().Title == "Dell").ToList();
Updated :
And Hopeless's Answers is (best answers):
var lslist2= Stores.Where(s => s.Name == "lilo" && s.Products.Any(p => p.Title == "Dell" && p.Colors.Any(c => c.Color.Name == "Blue"))).ToList();
And by Linq :
var test = (from s in Stores
from p in s.Products
from c in p.Colors
where s.Name=="Lilo" && p.Title=="Dell"&& c.Name=="Blue"
select s
).ToList();
Related
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));
I'm working on a class assignment and got a bit lost in LINQ.
I have 3 tables, 'oltandok' contains the data of persons, 'preferenciak' contains the preferred vaccine of that person with 3 columns:
an FK for table oltandok
a number indicating the order of preferences (1 is highest, 6 is lowest preferred)
an FK for another table containing the data on the vaccines called 'vakcinak'
I would like to display the data in a DataGridView the following way:
Personal data and the preferred vaccines in different columns:
Pref1 - Name of the vaccine where pref == 1
Pref2 - Name of the vaccine where pref == 2
etc.
This is where I am with my code, but I'm not sure how to select the preferences properly.
manu_rogz.DataSource = ( from x in context.oltandok
join y in context.preferencia on x.TAJ equals y.oltandok_FK
select new
{
TAJ = x.TAJ,
Nev = x.nev,
Szuletesnap = x.birthdate,
Pref1 = ???
Pref2 = ???
}
).ToList();
Because the preferenciak table contains multiple rows per person, you will need to perform some grouping.
Here is some very rough code which illustrates one way to do that.
using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main(string[] args)
{
var persons = new List<Person> { new Person { ID = 11, PersonName = "Alice" }, new Person { ID = 22, PersonName = "Bob" } };
var vaccines = new List<Vaccine> { new Vaccine(){ ID = 111, VaccineName= "Pfizer" }, new Vaccine(){ ID = 222, VaccineName = "Moderna" } };
var preferences = new List<VaccPref>
{
new VaccPref() { Person_FK = 11, Preference = 1, Vaccine_FK = 111 },
new VaccPref() { Person_FK = 11, Preference = 2, Vaccine_FK = 222 },
new VaccPref() { Person_FK = 22, Preference = 1, Vaccine_FK = 222 },
new VaccPref() { Person_FK = 22, Preference = 2, Vaccine_FK = 111 }
};
var prefsWithVaccNames = preferences.Join(vaccines, p => p.Vaccine_FK, v => v.ID, (pref, vaccine) => new Tuple<VaccPref, string>(pref, vaccine.VaccineName));
var groupedPrefs = prefsWithVaccNames.GroupBy(p => p.Item1.Person_FK);
var personPrefs = new List<PersonPrefs>();
foreach (var group in groupedPrefs)
{
personPrefs.Add(
new PersonPrefs()
{
Person_FK = group.Key,
Pref1 = group.Single(v => v.Item1.Preference == 1).Item2,
Pref2 = group.Single(v => v.Item1.Preference == 2).Item2,
});
}
var personPrefsWithPersonNames =
personPrefs.Join(
persons,
pp => pp.Person_FK,
p => p.ID,
(pp, p) => new NamedPersonPrefs() { Name = p.PersonName, Pref1 = pp.Pref1, Pref2 = pp.Pref2 }).ToArray();
}
}
class Person
{
public int ID { get; set; }
public string PersonName { get; set; }
}
class VaccPref
{
public int Person_FK { get; set; }
public int Preference { get; set; }
public int Vaccine_FK { get; set; }
}
class Vaccine
{
public int ID { get; set; }
public string VaccineName { get; set; }
}
class PersonPrefs
{
public int Person_FK { get; set; }
public string Pref1 { get; set; }
public string Pref2 { get; set; }
}
class NamedPersonPrefs
{
public string Name { get; set; }
public string Pref1 { get; set; }
public string Pref2 { get; set; }
}
This is a self-contained C# program which should produce a result similar to what you're after. You will of course need to adjust the class definitions (and change the table names) to suit your needs.
I've used LINQ's fluent syntax but you can use the SQL-like version if you prefer.
Supposed that I have these classes
public class Subject
{
public int Id { get; set; }
public string Category { get; set; }
public string Type { get; set; }
}
public class Student
{
public int Id { get; set; }
public List<MySubject> MySubjects { get; set; }
}
public class MySubject
{
public int Id { get; set; }
public string Category { get; set; }
public string Type { get; set; }
public string Schedule { get; set; }
public string RoomNumber { get; set; }
}
sample data
var subjects = new List<Subject>()
{
new Subject(){ Id = 1, Category = "Mathematics", Type = "Algebra" },
new Subject(){ Id = 2, Category = "Computer Science", Type = "Pascal" }
};
var student = new Student()
{ Id = 1, MySubjects = new List<MySubject>() {
new MySubject() {Id = 1, Category = "Mathematics", Type = "Algebra" },
new MySubject() {Id = 3, Category = "Mathematics", Type = "Trigonometry"},
}
};
//TODO: Update list here
student.MySubjects.ForEach(i => Console.WriteLine("{0}-{1}-{2}\t", i.Id, i.Category, i.Type));
the above line of code returns
1-Mathematics-Algebra
3-Mathematics-Trigonometry
which is incorrect. I need to return this
1-Mathematics-Algebra
2-Computer Science-Pascal
Basically I would like to modify and iterate the student.MySubjects and check its contents against subjects.
I would like to remove the subjects (3-Mathematics-Trigonometry) that are not present in the subjects and also ADD subjects that are missing (2-Computer Science-Pascal).
Can you suggest an efficient way to do this by searching/comparing using Category + Type?
Try like below.
// Remove those subjects which are not present in subjects list
student.MySubjects.RemoveAll(x => !subjects.Any(y => y.Category == x.Category && y.Type == x.Type));
// Retrieve list of subjects which are not added in students.MySubjects
var mySubjectsToAdd = subjects.Where(x => !student.MySubjects.Any(y => y.Category == x.Category && y.Type == x.Type))
.Select(x => new MySubject() {
Id = x.Id,
Category = x.Category,
Type = x.Type
}).ToList();
// If mySubjectsToAdd has any value then add it into student.MySubjects
if (mySubjectsToAdd.Any())
{
student.MySubjects.AddRange(mySubjectsToAdd);
}
student.MySubjects.ForEach(i => Console.WriteLine("{0}-{1}-{2}\t", i.Id, i.Category, i.Type));
// make an inner join based on mutual values to filter out wrong subjects.
var filteredList =
from mySubject in student.MySubjects
join subject in subjects
on new { mySubject.Category, mySubject.Type }
equals new { subject.Category, subject.Type }
select new MySubject { Id = mySubject.Id, Category = mySubject.Category, Type = mySubject.Type };
// make a left outer join to find absent subjects.
var absentList =
from subject in subjects
join mySubject in filteredList
on new { subject.Category, subject.Type }
equals new { mySubject.Category, mySubject.Type } into sm
from s in sm.DefaultIfEmpty()
where s == null
select new MySubject { Id = subject.Id, Category = subject.Category, Type = subject.Type };
student.MySubjects = filteredList.ToList();
student.MySubjects.AddRange(absentList.ToList());
I have a self join table of population. Population is entered at village level and it should be automatically calculated on Union council(UC), Tehsil and District Level.
I am using .net MVC in this application. Following is my code
enum of population type
public enum UnitType
{
Village,
UC,
Tehsil,
Dist
}
population structure, here names of villages, UC, Tehsil and district are added
public class Village
{
public int Id { get; set; }
public string Name { get; set; }
public UnitType UnitType { get; set; }
public int? ParientId { get; set; }
public Village Parient { get; set; }
}
Enter population at village level
public class Population
{
public int Id { get; set; }
public int VillageId { get; set; }
public Village Village { get; set; }
public int NoOfPerson { get; set; }
}
I need the following output result. I can get the village level population but i am confused in getting related totals. Its looks very simple but i think i am not going in right direction.
POPULATION
Code Name Type Population
1 Chakwal Disttrict 20000 (total population of all tehsils)
2 Choa Tehsil 20000 (Tehsil total of two Union Councils)
3 Dalwal UC 14300 UC is total of village population
4 Waulah Village 9800
5 DalPur VIllage 4500
Dulmial UC 5700 UC is total of village population
Tatral Village 3400
Arar Village 2300
You need to join the two classes :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
const string FILENAME = #"c:\temp\test.txt";
static void Main(string[] args)
{
List<Village> villages = new List<Village>() {
new Village() { Id = 1, Name = "Chakwal", UnitType = UnitType.Dist},
new Village() { Id = 2, Name = "Choa", UnitType = UnitType.Tehsil},
new Village() { Id = 3, Name = "Dalwal", UnitType = UnitType.UC},
new Village() { Id = 4, Name = "Waulah", UnitType = UnitType.Village},
new Village() { Id = 5, Name = "DalPur", UnitType = UnitType.Village},
new Village() { Id = 6, Name = "Dulmial", UnitType = UnitType.UC},
new Village() { Id = 7, Name = "Tatral", UnitType = UnitType.Village},
new Village() { Id = 8, Name = "Arar", UnitType = UnitType.Village}
};
List<Population> populations = new List<Population>() {
new Population() { Id = 1, NoOfPerson = 20000},
new Population() { Id = 2, NoOfPerson = 20000},
new Population() { Id = 3, NoOfPerson = 14300},
new Population() { Id = 4, NoOfPerson = 9800},
new Population() { Id = 5, NoOfPerson = 4500},
new Population() { Id = 6, NoOfPerson = 5700},
new Population() { Id = 7, NoOfPerson = 3400},
new Population() { Id = 8, NoOfPerson = 2300}
};
var results = (from v in villages
join p in populations on v.Id equals p.Id
select new { v = v, p = p }
).ToList();
StreamWriter writer = new StreamWriter(FILENAME);
writer.WriteLine("{0,25}","POPULATION");
writer.WriteLine("{0,-5}{1,-8}{2,-14}{3,-10}", "Code", "Name", "Type", "Population");
foreach (var result in results)
{
writer.WriteLine("{0,-5}{1,-8}{2,-14}{3,-10}", result.v.Id.ToString(), result.v.Name, result.v.UnitType.ToString(), result.p.NoOfPerson.ToString());
}
writer.Flush();
writer.Close();
}
}
public enum UnitType
{
Village,
UC,
Tehsil,
Dist
}
public class Village
{
public int Id { get; set; }
public string Name { get; set; }
public UnitType UnitType { get; set; }
public int? ParientId { get; set; }
public Village Parient { get; set; }
}
public class Population
{
public int Id { get; set; }
public int VillageId { get; set; }
public Village Village { get; set; }
public int NoOfPerson { get; set; }
}
}
Here is the answer for the question
var villages = db.Populations.Include(l => l.Village).ToList();
var ucpop = villages.GroupBy(l => l.UCId).Select(g=> new {
ucId = g.Key,
UcName = db.Villages.Find(g.Key),
VillageCount = g.Count(),
UCPop = g.Sum(l=>l.NoOfPerson),
villages = g.Where(l=>l.Village.UnitType == UnitType.Village).ToList()
}).ToList();
var tehpop = ucpop.GroupBy(l => l.UcName.ParientId).Select(g => new
{
tehId = g.Key,
tehName = db.Villages.Find(g.Key),
tehCount = g.Count(),
tehPop = g.Sum(l => l.UCPop),
uclist = g.Where(l=>l.UcName.UnitType == UnitType.UC).ToList()
}).ToList();
var distpop = tehpop.GroupBy(l => l.tehName.ParientId).Select(g => new
{
distId = g.Key,
distName = db.Villages.Find(g.Key),
distCount = g.Count(),
distPop = g.Sum(l => l.tehPop),
tehlist = g.Where(l => l.tehName.UnitType == UnitType.Tehsil).ToList()
}).ToList();
How can I add the following data on the table into a list called Vehicles?
public class criterias
{
public double values { get; set; }
public double time { get; set; }
}
public class movChannels
{
public string name { get; set; }
public IList<criterias> criteria = new List<criterias>();
}
public class stepsList
{
public string steps { get; set; }
public IList<movChannels> stepChannelsCriteria = new List<movChannels>();
}
public class vehicles
{
public int vehID { get; set; }
public string vehDescription { get; set; }
public IList<stepsList> vehValCriteria = new List<stepsList>();
}
Now, how can I add the data that I have in the table shown into a list called Vehicles? I will create other vehicles later...
You had several bad decisions, some were design flaws and some were minor C# naming convention violations.
Couple of worth mentions flaws:
vehID should have been a string and not int (Example "XPT")
Movment has Name, Value and Time. It doesn't have a list of Values and Times.
Creation:
List<Vehicle> vehicles = new List<Vehicle>();
Vehicle vehicle = new Vehicle()
{
Id = "XPT",
Description = "Average Car",
Steps = new List<Step>()
{
new Step() {
Name = "move car",
Movements = new List<Movement>()
{
new Movement("engage 1st gear", 1, 1),
new Movement("reach 10kph", 10, 5),
new Movement("maintain 10kph", 10, 12),
}
},
new Step() {
Name = "stop car",
Movements = new List<Movement>()
{
new Movement("reach 0kph", 10, 4),
new Movement("put in neutral", 0, 1),
new Movement("turn off vehicle", 0, 0),
}
}
}
};
vehicles.Add(vehicle);
Entities:
public class Movement
{
public string Name { get; set; }
public double Values { get; private set; }
public double Time { get; private set; }
public Movement(string name, double values, double time)
{
Name = name;
Values = values;
Time = time;
}
}
public class Step
{
public string Name { get; set; }
public IList<Movement> Movements { get; set; }
}
public class Vehicle
{
public string Id { get; set; } // Should be changed to string
public string Description { get; set; }
public IList<Step> Steps { get; set; }
}
You should create your classes like the following:
public class criterias
{
public double values { get; set; }
public double time { get; set; }
}
public class movChannels
{
public movChannels
{
criteria = new List<criterias>();
}
public string name { get; set; }
public IList<criterias> criteria { get; set; }
}
public class stepsList
{
public stepsList
{
stepChannelsCriteria = new List<movChannels>();
}
public string steps { get; set; }
public IList<movChannels> stepChannelsCriteria { get; set; }
}
public class vehicles
{
public vehicles
{
vehValCriteria = new List<stepsList>();
}
public int vehID { get; set; }
public string vehDescription { get; set; }
public IList<stepsList> vehValCriteria { get; set; }
public movChannels movments { get; set; }
}
What about that?
public class VehiclesViewModel
{
public List<vehicles> Vehicles { get; private set; }
public void Initalize()
{
this.Vehicles = new List<vehicles>();
var vehicle = new vehicles
{
vehID = 1,
vehDescription = "firstDescription",
};
var stepsList = new stepsList
{
steps = "firstStep",
};
var movChannel = new movChannels
{
name = "firstChannel",
};
var criteria = new criterias
{
values = 0.5,
time = 0.5
};
movChannel.criteria.Add(criteria);
stepsList.stepChannelsCriteria.Add(movChannel);
vehicle.vehValCriteria.Add(stepsList);
this.Vehicles.Add(vehicle);
}
}
it seems in your table the VehicleId is of type string. Make sure your VehicleId property in Vehicle class also matches the same.
You can use the collection initializers to set the values of child objects like this way:
var data = new vehicles()
{
vehID = 1,
vehDescription = "Average Car",
vehValCriteria = new List<stepsList>()
{
new stepsList()
{
steps = "Move car",
stepChannelsCriteria = new List<movChannels>()
{
new movChannels()
{
name = "engage firstgear",
criteria = new List<criterias>()
{
new criterias()
{
values = 1,
time = 1
},
}
},
new movChannels()
{
name = "reach 10kph",
criteria = new List<criterias>()
{
new criterias()
{
values = 10,
time = 5
},
}
},
new movChannels()
{
name = "maintain 10kph",
criteria = new List<criterias>()
{
new criterias()
{
values = 10,
time = 12
},
}
}
}
},
new stepsList()
{
steps = "stop car",
stepChannelsCriteria = new List<movChannels>()
{
new movChannels()
{
name = "reach okph",
criteria = new List<criterias>()
{
new criterias()
{
values = 10,
time = 4
},
}
},
new movChannels()
{
name = "put in neutral",
criteria = new List<criterias>()
{
new criterias()
{
values = 0,
time = 1
},
}
},
new movChannels()
{
name = "turn off vehicle",
criteria = new List<criterias>()
{
new criterias()
{
values = 0,
time = 0
},
}
}
}
}
}
};
You can fill your list by moving from top to bottom, like
Create Criterias List then Create movChannel object and add that list
to Criterias object and so on
However if you want to avoid this way, there is another way. If you are using Linq To List then follow this
Get a simple flat object to a list object
var TableData = db.Tablename.Tolist();
Then fill your own object like this
Vehicles finalList = TableData.Select(a => new Vehicles()
{
vehID = a.Id,
vehDescription = a.des,
vehValCriteria = TableData.Where(b => b.StepslistId == a.StepslistId)
.Select(c => new StepsList()
{
steps = c.Steps,
stepChannelsCriteria = TableData.Where(d => d.channelId == c.channelId)
.select(e => new MovChannels()
{
name = e.name,
criteria = TableData.Where(f => f.criteriasId = e.criteriasId)
.Select(g => new Criterias()
{
values = g.Values,
time = g.Time
}).ToList()
}).ToList()
}).ToList()
}).ToList();
This is standard way to fill list within list