Develop Reference

LINQ - Condition with .Contains() is not working as expected

I cannot seem to get the desirable filtered result from my query.
Data
public class fdp_1115
{
public string Id{ get; set; }
public string Number{ get; set; }
public string Type{ get; set; }
}
List<fdp_1115> fdpList = new List<fdp_1115>
{
new fdp_1115 { Id = "1", Number = "Lot123", Type = "D14MWT" },
new fdp_1115 { Id = "2", Number = "Lot123", Type = "E12WBC7W1" }
};
List<string> searchValues = new List<string> { "MLE12WBC7W1 A R" };
LINQ:
var LocType = fdpList.FirstOrDefault(d => searchValues.Any(s => d.Type.Contains(s)));
if (LocType != null)
{
Console.WriteLine("Matching record found:");
Console.WriteLine($"Id: {LocType.Id}, Number: {LocType.Number}, Type: {LocType.Type}");
}
else
{
Console.WriteLine("No matching records found.");
}
The result I wanted is:
Matching record found:
Id: 2, Number: Lot123, Type: E12WBC7W1
But I got "No matching records found." which indicates that LocType == null.
I already tried trimming and ignoring case sensitive:
var LocType = fdpList.FirstOrDefault(d => searchValues.Any(s => d.Type.Contains(s.Trim().Replace(" ", ""))));
var LocType = fdpList.FirstOrDefault(d => searchValues.Any(s => d.Type.Contains(s, StringComparison.InvariantCultureIgnoreCase)));
But still no luck. Any idea how do I match "MLE12WBC7W1 A R" with "E12WBC7W1"?

You have your contains the other way around.
d.Type = "E12WBC7W1"
and
s = "MLE12WBC7W1 A R"
Then "E12WBC7W1" does not Contains "MLE12WBC7W1 A R"
It is the other way around.
var LocType = fdpList.FirstOrDefault(d => searchValues.Any(s => s.Contains(d.Type)));

Your current logic checks whether there is any object with Type value that contains the value for each string in the searchValues array.
From your requirement:
You want to filter the object that fulfills there is any string in searchValues containing the value of Type.
Thus it should be:
var LocType = fdpList.FirstOrDefault(d => searchValues.Any(s => s.Contains(d.Type)));

How can I distinct with condition?

Here is class UserArrived:
public class UserArrived{
public string id{get;set;}
}
Here is class OldUser:
public class OldUser{
public string id{get;set;}
public DateTime lastArrived{get;set;}
}
And here is class User:
public class User{
public string id{get;set;}
public Boolean newUser{get;set;}
}
Finally, here is two List:
List<UserArrived> UserArrivedList=new List<UserArrived>();
List<OldUser> OldUserList=new List<OldUser>();
All the id in each class is unique.
Now I need to combine UserArrived and OldUser to a brand new List<User>.
As we know, the user arrives the shop may is a new user or an old user. If the user id in UserArrived also contains in OldUser, the property newUser in the new List is false for true.
In my opinion, I will combine two List into one first and then use the distinct method to remove the duplicates.
However, it seems the distinct can not run with a condition.
Although I can use several foreach to solve this while I feel it is so troublesome. I want to use something easy just like lambda or linq. How can I achieve this?
=============================
Here is an example of the input:
List<UserArrived> UserArrivedList=new List<UserArrived>(){new UserArrived(){id="A"},new UserArrived(){id="B"},new UserArrived(){id="C"}};
List<OldUser> OldUserList=new List<OldUser>(){new OldUser(){id="B",lastArrived=DateTime.Now}};
the output is:
A,true
B,false
C,true

If I understand your requirement you're saying that if an id is in both lists then the user is an old user, otherwise it is a new user.
So here's the simplest way that I could come up with to do it:
IEnumerable<User> users =
Enumerable
.Concat(
UserArrivedList.Select(i => i.id),
OldUserList.Select(i => i.id))
.ToLookup(x => x)
.Select(x => new User() { id = x.Key, newUser = x.Count() == 1 });
Let's test with some input:
var UserArrivedList = new List<UserArrived>()
{
new UserArrived() { id = "A" },
new UserArrived() { id = "B" },
};
var OldUserList = new List<OldUser>()
{
new OldUser() { id = "B" },
new OldUser() { id = "C" },
};
Here are my results:
B is the only user who appears in both lists so should be False.
So, there's a bit of confusion about the requirements here.
The OP has added a concrete example of the input data and the expected output.
var UserArrivedList = new List<UserArrived>()
{
new UserArrived() { id = "A" },
new UserArrived() { id = "B" },
new UserArrived() { id = "C" }
};
var OldUserList = new List<OldUser>()
{
new OldUser() { id = "B", lastArrived = DateTime.Now }
};
With this input the OP is expecting True, False, True for A, B, C respectively.
Here is the code of the four current answers:
var results = new []
{
new
{
answered = "Enigmativity",
users = Enumerable
.Concat(
UserArrivedList.Select(i => i.id),
OldUserList.Select(i => i.id))
.ToLookup(x => x)
.Select(x => new User() { id = x.Key, newUser = x.Count() == 1 })
},
new
{
answered = "JQSOFT",
users = UserArrivedList.Select(x => x.id)
.Concat(OldUserList.Select(y => y.id))
.Distinct()
.Select(x => new User
{
id = x,
newUser = OldUserList.Count(o => o.id == x) == 0,
})
},
new
{
answered = "Anu Viswan",
users =
UserArrivedList
.Join(OldUserList, ual => ual.id, oul => oul.id, (ual, oul) => new User { id = oul.id, newUser = false })
.Concat(UserArrivedList.Select(x => x.id).Except(OldUserList.Select(x => x.id))
.Concat(OldUserList.Select(x => x.id).Except(UserArrivedList.Select(x => x.id)))
.Select(x=> new User{ id = x, newUser = true}))
},
new
{
answered = "Barns",
users =
UserArrivedList.Select(i => i.id)
.Union(OldUserList.Select(i => i.id))
.Select(j => new User
{
id = j,
newUser =
!(UserArrivedList.Select(i => i.id).Contains(j)
&& OldUserList.Select(i => i.id).Contains(j))})
}
};
That gives the output of:
So, currently all of the answers presented match the OP's example.
I'd be interested in the OP commenting on this as the input data:
var UserArrivedList = new List<UserArrived>()
{
new UserArrived() { id = "A" },
new UserArrived() { id = "B" },
};
var OldUserList = new List<OldUser>()
{
new OldUser() { id = "B" },
new OldUser() { id = "C" },
};
When I run this I get this output:
Here three users match and one does not.
This all boils down to what the description means:
As we know, the user arrives the shop may is a new user or an old user. If the user id in UserArrived also contains in OldUser, the property newUser in the new List is false for true.

The thing about LINQ--it isn't always easy. In fact it can get quit cluttered. In the question statement I read,
I want to use something easy just like lambda or linq.
Well, that is relative. But, I think that when using LINQ, one should try to keep it simple. Even break the statement down into multiple statements if necessary. For that reason I propose this solution (demonstrated in a console app):
static void Main(string[] args)
{
Console.WriteLine();
Console.WriteLine("--------------------Test This Code -----------------------");
var combined = TestUserCombined();
//The following is just to demonstrate the list is populated properly
combined.OrderBy(s => s.id.PadLeft(4, '0')).ToList().ForEach(k => Console.WriteLine($"X id: {k.id} | isNew:{k.newUser}"));
}
private static IEnumerable<User> TestUserCombined()
{
List<UserArrived> userArrivedList=new List<UserArrived>();
List<OldUser> oldUserList=new List<OldUser>();
//populate the lists...
for(int i = 0; i < 20; i+=2)
{
var userArrived = new UserArrived();
userArrived.id = i.ToString();
userArrivedList.Add(userArrived);
}
for(int i = 0; i < 20; i+=3)
{
var oldUser = new OldUser();
oldUser.id = i.ToString();
oldUserList.Add(oldUser);
}
//Now for the solution...
var selectedUserArrived = userArrivedList.Select(i => i.id);
var selectedOldUser = oldUserList.Select(i => i.id);
var users = selectedUserArrived
.Union(selectedOldUser)
.Select(j => new User{id=j,newUser=!(selectedUserArrived.Contains(j) && selectedOldUser.Contains(j))});
return users;
}
Certainly, this all could have been done in one statement, but I believe this makes it more readable and understandable.
EDIT:
There has been some discussion amongst the coders posting solutions as to exactly what conditions must be met in order for the value "newUser" to be set to "true". It was my understanding from the initial posted question that the "id" must be present in both lists "UserArrivedList" AND "OldUserList", but I tend to agree with #JQSOFT that it makes more sense that the only condition that must be met should be that the "id" need only be present in "OldUserList". If that is indeed the case than the Select() expression above should be .Select(j => new User{id=j,newUser=!selectedOldUser.Contains(j)});

I hope I understood your query. One way to achieve this using Linq would be
var users = UserArrivedList.Join(OldUserList,ual=>ual.id,oul=>oul.id,(ual,oul)=>new User{id=oul.id,newUser=false})
.Concat(UserArrivedList.Select(x=>x.id).Except(OldUserList.Select(x=>x.id))
.Concat(OldUserList.Select(x=>x.id).Except(UserArrivedList.Select(x=>x.id)))
.Select(x=> new User{id=x,newUser=true}));

Now you need to create a distinct list of User type from two lists of different types; UserArrived and OldUser objects. A user is identified by a unique id of string type.
Accordingly, I'd suggest this:
var users = UserArrivedList.Select(x => x.id)
.Concat(OldUserList.Select(y => y.id))
.Distinct()
.Select(x => new User
{
id = x,
newUser = OldUserList.Count(o => o.id == x) == 0,
}).ToList();
Which gets the unique ids from both UserArrivedList and OldUserList and creates new User object for each. The OldUserList.Count(o => o.id == x) == 0, assigns false to the newUser property if the user id exists in the OldUserList otherwise true.

How to search with LINQ entites having string[] array properties and find these containing any of string from string[] array?

With EF Core 2.2 I am having entities with string[] array properties, where in ApplicationDbContext they are retreived with:
modelBuilder.Entity<FruitBasket>()
.Property(e => e.FruitTypes)
.HasConversion(
v => string.Join(',', v),
v => v.Split(',', StringSplitOptions.RemoveEmptyEntries));
For example an entity mat contain in FruitType column an strning array: {"Apple", "Banana", "Orange"} saved in the database as: Apple,Banana,Orange
I am trying to find in my DB all objects containing any of string from my input string, lets say any of:
string[] BasketSearchedFruitTypes = new string[] { "Apple", "Grapefruit", "Pineaple" }
My IQueryable:
IQueryable<BasketModel> baskets = GetBasketsQueryable(); //BasketModel contains FruitType string[] prop
To search for entities I have right now LINQ that says:
if (search.BasketSearchedFruitTypes != null && search.BasketSearchedFruitTypes.Length != 0)
baskets = baskets
.Where(data => search.BasketSearchedFruitTypes
.Any(x => data.FruitType
.Contains(x)));
Unfortunatelly it returns me nothing and I ran out of ideas.
EDIT 1:
after using expression:
baskets = baskets
.Where(data => search.BasketSearchedFruitTypes
.Any(x => data.FruitType
.Contains(x)));
when I try take it to the List<>, I am getting ArgumentNullException. Also I am not able to use foreach, .Count() on it. Same I have with:
var result = baskets.Where(data => search.BasketSearchedFruitTypes.Intersect(data.FruitType).Any();
EDIT 2:
I just noted, that foreach loop goes through returned IQueryable, but at some point breaks giving ArgumentNullException. Even try catch inside of the loop does not help...
EDIT 3:
Actually when I place foreach of returned IQueryable into try catch, it is kind of temporary solution and it works fine. But still I do not understand why it crashes on enumerating (looping, not code inside of the loop).

If I make a list similar at your DB protocol Than this codes work for me.
using System.Collections.Generic;
using System.Linq;
namespace ConsoleApp2
{
class BuilderClass
{
List<BasketModel> baskets;
public BuilderClass()
{
baskets = new List<BasketModel>()
{ new BasketModel { FruitType = new string[] { "Apple", "Grapefruit", "Pineaple", "Bing Cherry", "Cantaloupe" } },
new BasketModel { FruitType = new string[] { "Grapefruit", "Cantaloupe", "Pineaple", "Boysenberries", "Apple" } },
new BasketModel { FruitType = new string[] { "Clementine", "Bing Cherry", "Boysenberries", "Cantaloupe", "Entawak" } },
new BasketModel { FruitType = new string[] { "Entawak", "Grapefruit", "Apple", "Pineaple", "Cantaloupe" } },
new BasketModel { FruitType = new string[] { "Apple", "Pineaple", "Bing Cherry", "Entawak", "Grapefruit" } }
};
}
string[] BasketSearchedFruitTypes = new string[]
{ "Apple", "Grapefruit", "Pineaple" };
public void check()
{
var qbaskets = baskets.AsQueryable();
if (BasketSearchedFruitTypes != null && BasketSearchedFruitTypes.Length != 0)
{
var result = qbaskets.Where(data => BasketSearchedFruitTypes.Any(x => data.FruitType.Contains(x))).ToList();
// result have list with count of 4
}
}
}
class BasketModel
{
public string[] FruitType { get; set; }
}
}

JSON File and LINQ Sum and Group

Could I please get some help with querying from a JSON file? Populating a datagrid view works just fine but what I am trying to do now is filter the data using LINQ which I'm really struggling with.
This works just fine, populating the datagridview with all of my jsonfile data
//dataGridView1.DataSource = (from p in movie2
// select p).ToArray();
Below is what I have been playing around with. When I group by employee ID into g, I can not longer use my p references to fields.
using (StreamReader file = File.OpenText(#"C:\temp\GRMReportingJSONfiles\Assigned_FTE\" + myFile))
{
JsonSerializer serializer = new JsonSerializer();
IEnumerable<AssgnData> movie2 = (IEnumerable<AssgnData>)serializer.Deserialize(file, typeof(IEnumerable<AssgnData>));
dataGridView1.DataSource = (from p in movie2
group p by p.EMPLID[0] into g
select new {
EMPLID = p.EMPLID,
(decimal?)decimal.Parse(p.MNTH1) ?? 0).Sum(),
};
);
//dataGridView1.DataSource = (from p in movie2
// select Int32.Parse(p.MNTH1).Sum();
dataGridView1.DataSource = (from p in movie2
group p by p.EMPLID[0] into g
select (decimal?)decimal.Parse(p.MNTH1) ?? 0).Sum(); //dataGridView1.DataSource = (from p in movie2
// select p).ToArray();
//where p.Resource_BU == "7000776"
//chart1.DataBindCrossTable(movie2, "MNTH1", "1", "PROJECT_ID", "Label = FTE");
//chart1.Refresh();
}
Here is part of the array layout, removed other fields for now as I was just trying to focus on these two, dataset has 100k rows and 50 columns
public class AssgnData
{
public string EMPLID { get; set; }
public string MNTH1 { get; set; }
}

In my opinion, using Fluent Syntax usually makes it a bit easier to understand what is going wrong here.
As soon as you group your data you are no longer working on the individual objects, but on a 'group', which is the key and an enumerable of objects.
Getting the sum per employee should then be grouping by the full employee id and then parsing the MNTH1 fields of your objects and summing them.
dataGridView1.DataSource = movie2
.GroupBy(p => p.EMPLID) // create a group of data per employee
.Select(g => new
{
EMPLID = g.Key, // the employee id is the group key
Sum = g.Sum(data => decimal.Parse(data.MNTH1)) // parse and sum
})
.ToArray();
Edit: you are right, you need the ToArray to evaluate the query. I just verified on my computer and it works.

Try following :
class Program
{
static void Main(string[] args)
{
IEnumerable<AssgnData> movie2 = null;
dataGridView1.DataSource = movie2.GroupBy(x => new {id = x.EMPLID, month = x.MNTH1})
.Select(x => new {
EMPLYID = x.Key.id,
MONTH = x.Key.month,
SUM = x.Sum(y => y.value)
});
}
}
public class AssgnData
{
public string EMPLID { get; set; }
public string MNTH1 { get; set; }
public int value { get;set;}
}

How can I create a list inside a list with a foreach in c# ?

In other words I need all the elements of list "Categories" to be the "Parent" and elements of list "commodities" be the children.
Example
public string GetCommodities()
{
List<dynamic> categories = new List<dynamic>();
List<dynamic> commodities = new List<dynamic>();
foreach (var comcat in QuickQuoteRepo.CommodityCategories.All().OrderBy(o => o.Order))
{
categories.Add(new
{
comcat.Category,
});
foreach (var com in comcat.Commodities.OrderBy(o => o.Name))
{
commodities.Add(new
{
com.Name,
});
}
}
var response = new JavaScriptSerializer().Serialize(commodities);
return response;
}
And see if it's possible to all commodities names inside each category, within this foreach.
I tried adding a dynamic list such as:
dynamic listOfElements = new { CAT = categories, COMM = commodities };
But it does't return elemnts as parents or dependency of categories. Is the same as adding
commodities.Add(new
{
comcat.Category,
com.Name,
});

public string GetCommodities()
{
List<dynamic> categoryCommodityList = new List<dynamic>();
foreach (var comcat in QuickQuoteRepo.CommodityCategories.All().OrderBy(o => o.Order))
{
var allCommodities = comcat.Commodities.OrderBy(o => o.Name).Select(com => com.Name).ToList();
categoryCommodityList.Add(new { Catagory = comcat.Category, Items = allCommodities } );
}
return new JavaScriptSerializer().Serialize(categoryCommodityList);
}

You class structure does not support parent-child relationships. I mean, if what you want is that each Category holds a list of commodities, then you would need something like this:
var result = from c in comcat
select new { Category = c, Commoddities = c.Commoddities};
This will return a hierarchy of Categories including all Commodities underneath it.
If you are just receiving a flat data set, then you need something like this:
var result = from c in comcat
select new { Category = c,
Commoddities = c.Where(x=>x.Category.Name == c.Name).Select(x=>x.Commodity) };
Hopefully you get the idea...