I have an IEnumerable and am trying to first filter with .Where on a bool and then GroupBy like this
int someInt = orderEditorViewModel.EditOrderFitters.Where(f => f.Delete == false).GroupBy(f => f.OrderFitter.Person).Count();
EditOrderFitters is a List of
public class EditOrderFitter
{
[Display(Name = "Delete?")]
public bool Delete { get; set; }
public bool Added { get; set; } // this is hidden
public OrderFitter OrderFitter { get; set; }
}
But the query includes EditOrderFitter even when Delete is true
I used this longwinded workaround to filter out first
List<EditOrderFitter> notDeletedOrderFitters = new List<EditOrderFitter>();
foreach (EditOrderFitter e in orderEditorViewModel.EditOrderFitters)
{
if (!e.Delete)
{
notDeletedOrderFitters.Add(e);
}
}
And then:
int someInt = notDeletedOrderFitters.GroupBy(f => f.OrderFitter.Person).Count();
That works, but what's wrong with the
.Where(f => f.Delete == false)
in the first linq query. I also tried this:
int someInt = orderEditorViewModel.EditOrderFitters.Where(f => !f.Delete).GroupBy(f => f.OrderFitter.Person).Count();
but again the list wasn't filtered
Apologies everyone, I was looking at the LHS of this if statement to test for duplicate entries in a list when I should have been looking at both
if (orderEditorViewModel.EditOrderFitters.Where(f => f.Delete == false).GroupBy(f => f.OrderFitter.Person).Count() < orderEditorViewModel.EditOrderFitters.Where(f => f.Delete == false).Count())
Thanks for the replies and comments!
I forgot to put the delete on both sides
I've just reproduced your situation and it gives me the correct result, You can check to live here
using System;
using System.Linq;
// https://stackoverflow.com/questions/59702370/c-sharp-linq-groupby-query-ignoring-where-on-bool
public class Program
{
public static void Main()
{
var orderEditorViewModel = new
{
ParentName = "xyz",
EditOrderFitters = new []
{
new EditOrderFitter { Delete = true, OrderFitter = new OrderFitter { Id = 1, Person = "1" } },
new EditOrderFitter { Delete = false, OrderFitter = new OrderFitter { Id = 1, Person = "2" } },
new EditOrderFitter { Delete = false, OrderFitter = new OrderFitter { Id = 1, Person = "2" } },
new EditOrderFitter { Delete = false, OrderFitter = new OrderFitter { Id = 1, Person = "3" } }
}
};
var result = orderEditorViewModel.EditOrderFitters.Where(f => !f.Delete).GroupBy(f => f.OrderFitter.Person);
foreach(var item in result)
Console.WriteLine("" + " Count: " + item.Count());
}
public class EditOrderFitter
{
public bool Delete { get; set; }
public bool Added { get; set; }
public OrderFitter OrderFitter { get; set; }
}
public class OrderFitter
{
public int Id { get; set; }
public string Person { get; set; }
}
}
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));
Could anyone give me a hint on how to resolve the next task?
I have such a classes structure
public class Test
{
public string Title { get; set; }
public ICollection<Question> Questions { get; set; }
}
public class Question
{
public string Description { get; set; }
public ICollection<AnswerItem> AnswerItems { get; set; }
}
public class AnswerItem
{
public string Defenition { get; set; }
public bool IsCorrect { get; set; }
}
After fetching the [Test] entity from DB I've got IQueryable<Test>. And further, I wonder how to get all Question entities (as a list) with all info where each Question item would have all info about AnswerItem collection.
I have tried the next query, but it returns only a collection of all answers:
var questList = test.SelectMany(t => t.Questions.SelectMany(q => q.AnswerItems)).ToList();
And I need something like this:
Questions = new List<Question>
{
new Question
{
Name = "Question_1",
AnswerItems = new List<AnswerItem>
{
new AnswerItem { Name = "answer_1", IsCorrect = false },
new AnswerItem { Name = "answer_2", IsCorrect = false }
}
},
new Question
{
Name = "Question_2",
AnswerItems = new List<AnswerItem>
{
new AnswerItem { Name = "answer_1", IsCorrect = false },
new AnswerItem { Name = "answer_2", IsCorrect = false }
}
}
}
Your query should looks like the following one:
var query =
from t in ctx.Tests
from q in t.Questions
select new
{
Name = q.Description,
AnswerItems = q.AnswerItems.Select(a => new
{
Name = a.Defenition,
IsCorrect = a.IsCorrect
})
.ToList()
}
};
var result = query.ToList();
Lets say I have a list that contains 1 record:
[
{
"AccountNumber": 1234,
"eDocConfirms": true,
"eDocStatements": true,
"eDocTaxforms": false
}
]
This list is a strongly typed object with these properties:
public int AccountNumber { get; set; }
public bool? eDocConfirms { get; set; }
public bool? eDocStatements { get; set; }
public bool? eDocTaxforms { get; set; }
Using LINQ, I'd like to turn it into a list that looks like this:
[
{
"AccountNumber": 1234,
"EDocumentTypeName ": "Confirms"
},
{
"AccountNumber": 1234,
"EDocumentTypeName": "Statements"
}
]
This new list will a list of a different type:
public class DeliveryPreference
{
public int AccountNumber { get; set; }
public string EDocumentTypeName { get; set; }
}
Note that Taxforms was not included in the new list because it was set to false in the first list.
I know I could easily do this with some loops, but I would prefer using LINQ.
I understand that Stack Overflow prefers that I show what I have tried, but I am having trouble wrapping my brain around this.
For this case I would use additional function
public static IEnumerable<string> GetTrueProperties(Data t)
{
if (t.eDocConfirms == true) yield return "Confirms";
if (t.eDocStatements == true) yield return "Statements";
if (t.eDocTaxForms == true) yield return "Tax";
}
simply because it is an object and not a dictionary; else you could dynamically select properties which are true(or you could use reflection, but I think it would be too much here, since you have strongly typed object).
then it would look like
var list = new List<Data> {
new Data
{
AccountNumber = 1,
eDocConfirms = true,
eDocStatements = true,
eDocTaxForms = false
}
};
list.SelectMany(item => GetTrueProperties(item).Select(p => new DeliveryPreference
{
AccountNumber = item.AccountNumber,
EDocumentTypeName = p
}));
This is very ugly code, but it works. It should be easy to comprehend. Reflection can be extracted to a new function.
using System;
using System.Linq;
public class Program
{
public class Account {
public int AccountNumber { get; set; }
public bool? eDocConfirms { get; set; }
public bool? eDocStatements { get; set; }
public bool? eDocTaxforms { get; set; }
}
public class DeliveryPreference
{
public int AccountNumber { get; set; }
public string EDocumentTypeName { get; set; }
}
public static void Main()
{
var acc = new Account {
AccountNumber = 10,
eDocConfirms = true,
eDocStatements = false,
eDocTaxforms = true
};
var transformed = acc.GetType()
.GetProperties()
.Where(p => p.PropertyType == typeof(bool?)
&& ((bool?)p.GetValue(acc)).HasValue
&& ((bool?)p.GetValue(acc)).Value)
.Select(p => new DeliveryPreference {
AccountNumber = acc.AccountNumber,
EDocumentTypeName = p.Name.Substring(4)
});
foreach (var t in transformed) {
Console.WriteLine(t.AccountNumber);
Console.WriteLine(t.EDocumentTypeName);
}
}
}
I have the below two classes:
public class FirstInner
{
public int Id { get; set; }
public string Type { get; set; }
public string RoleId { get; set; }
}
public class SecondInner
{
public int Id { get; set; }
public string Type { get; set; }
}
Again, there are lists of those types inside the below two classes:
public class FirstOuter
{
public int Id { get; set; }
public string Name { get; set; }
public string Title { get; set; }
public List<FirstInner> Inners { get; set; }
}
public class SecondOuter
{
public int Id { get; set; }
public string Name { get; set; }
public List<SecondInner> Inners { get; set; }
}
Now, I have list of FirstOuter and SecondOuter. I need to check if FirstOuter list is a subset of SecondOuter list.
Please note:
The names of the classes cannot be changed as they are from different systems.
Some additional properties are present in FirstOuter but not in SecondOuter. When comparing subset, we can ignore their presence in SecondOuter.
No.2 is true for FirstInner and SecondInner as well.
List items can be in any order---FirstOuterList[1] could be found in SecondOuterList[3], based on Id, but inside that again need to compare that FirstOuterList[1].FirstInner[3], could be found in SecondOuterList[3].SecondInner[2], based on Id.
I tried Intersect, but that is failing as the property names are mismatching. Another solution I have is doing the crude for each iteration, which I want to avoid.
Should I convert the SecondOuter list to FirstOuter list, ignoring the additional properties?
Basically, here is a test data:
var firstInnerList = new List<FirstInner>();
firstInnerList.Add(new FirstInner
{
Id = 1,
Type = "xx",
RoleId = "5"
});
var secondInnerList = new List<SecondInner>();
secondInner.Add(new SecondInner
{
Id = 1,
Type = "xx"
});
var firstOuter = new FirstOuter
{
Id = 1,
Name = "John",
Title = "Cena",
Inners = firstInnerList
}
var secondOuter = new SecondOuter
{
Id = 1,
Name = "John",
Inners = secondInnerList,
}
var firstOuterList = new List<FirstOuter> { firstOuter };
var secondOuterList = new List<SecondOuter> { secondOuter };
Need to check if firstOuterList is part of secondOuterList (ignoring the additional properties).
So the foreach way that I have is:
foreach (var item in firstOuterList)
{
var secondItem = secondOuterList.Find(so => so.Id == item.Id);
//if secondItem is null->throw exception
if (item.Name == secondItem.Name)
{
foreach (var firstInnerItem in item.Inners)
{
var secondInnerItem = secondItem.Inners.Find(sI => sI.Id == firstInnerItem.Id);
//if secondInnerItem is null,throw exception
if (firstInnerItem.Type != secondInnerItem.Type)
{
//throw exception
}
}
}
else
{
//throw exception
}
}
//move with normal flow
Please let me know if there is any better approach.
First, do the join of firstOuterList and secondOuterList
bool isSubset = false;
var firstOuterList = new List<FirstOuter> { firstOuter };
var secondOuterList = new List<SecondOuter> { secondOuter };
var jointOuterList = firstOuterList.Join(
secondOuterList,
p => new { p.Id, p.Name },
m => new { m.Id, m.Name },
(p, m) => new { FOuterList = p, SOuterList = m }
);
if(jointOuterList.Count != firstOuterList.Count)
{
isSubset = false;
return;
}
foreach(var item in jointOuterList)
{
var jointInnerList = item.firstInnerList.Join(
item.firstInnerList,
p => new { p.Id, p.Type },
m => new { m.Id, m.type },
(p, m) => p.Id
);
if(jointInnerList.Count != item.firstInnerList.Count)
{
isSubset = false;
return;
}
}
Note: I am assuming Id is unique in its outer lists. It means there will not be multiple entries with same id in a list. If no, then we need to use group by in above query
I think to break the question down..
We have two sets of Ids, the Inners and the Outers.
We have two instances of those sets, the Firsts and the Seconds.
We want Second's inner Ids to be a subset of First's inner Ids.
We want Second's outer Ids to be a subset of First's outer Ids.
If that's the case, these are a couple of working test cases:
[TestMethod]
public void ICanSeeWhenInnerAndOuterCollectionsAreSubsets()
{
HashSet<int> firstInnerIds = new HashSet<int>(GetFirstOuterList().SelectMany(outer => outer.Inners.Select(inner => inner.Id)).Distinct());
HashSet<int> firstOuterIds = new HashSet<int>(GetFirstOuterList().Select(outer => outer.Id).Distinct());
HashSet<int> secondInnerIds = new HashSet<int>(GetSecondOuterList().SelectMany(outer => outer.Inners.Select(inner => inner.Id)).Distinct());
HashSet<int> secondOuterIds = new HashSet<int>(GetSecondOuterList().Select(outer => outer.Id).Distinct());
bool isInnerSubset = secondInnerIds.IsSubsetOf(firstInnerIds);
bool isOuterSubset = secondOuterIds.IsSubsetOf(firstOuterIds);
Assert.IsTrue(isInnerSubset);
Assert.IsTrue(isOuterSubset);
}
[TestMethod]
public void ICanSeeWhenInnerAndOuterCollectionsAreNotSubsets()
{
HashSet<int> firstInnerIds = new HashSet<int>(GetFirstOuterList().SelectMany(outer => outer.Inners.Select(inner => inner.Id)).Distinct());
HashSet<int> firstOuterIds = new HashSet<int>(GetFirstOuterList().Select(outer => outer.Id).Distinct());
HashSet<int> secondInnerIds = new HashSet<int>(GetSecondOuterList().SelectMany(outer => outer.Inners.Select(inner => inner.Id)).Distinct());
HashSet<int> secondOuterIds = new HashSet<int>(GetSecondOuterList().Select(outer => outer.Id).Distinct());
firstInnerIds.Clear();
firstInnerIds.Add(5);
firstOuterIds.Clear();
firstOuterIds.Add(5);
bool isInnerSubset = secondInnerIds.IsSubsetOf(firstInnerIds);
bool isOuterSubset = secondOuterIds.IsSubsetOf(firstOuterIds);
Assert.IsFalse(isInnerSubset);
Assert.IsFalse(isOuterSubset);
}
private List<FirstOuter> GetFirstOuterList() { ... }
private List<SecondOuter> GetSecondOuterList() { ... }
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