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;}
}
Related
i have a view where i get data from a table named 'PromotionHistory'. But in my table i stored ID of Designation. In Designation table i have DesignationName field and DesignationID. Both table have relation. I am using Web Api.
My code-
[HttpGet]
[Route("api/EmployeeApi/GetPromotionReport/")]
public object GetPromotionReport()
{
List<PromotionHistory> finalData;
//var proReport = db.PromotionHistories.Include(e => e.Designation).Include(e => e.Employee);
IEnumerable<PromotionHistory> pro = (from st in db.PromotionHistories select st).ToList();
foreach (PromotionHistory proH in pro)
{
var preD = proH.PreviousDesigID;
var currentD = proH.CurrentDesigID;
var preDName=(from dd in db.Designations where dd.DesignationID==preD select new{dd.DesignationName}).FirstOrDefault() ;
var CurrentDName=(from dd in db.Designations where dd.DesignationID==currentD select new{dd.DesignationName}).FirstOrDefault();
var cc = (from proHis in db.PromotionHistories
select new
{
proHis.PromotionID,
proHis.EmployeeID
}
).ToList();
finalData.AddRange(cc);
finalData.Add(preDName);
}
I want to get DesignationName instead of ID for the two field (previousPost, Current Post-see image)
How can i make Linq or SQL query in ASP Web Api as i am using Ajax.
What i want::
PromotionID ,EmplyeeID ,PromotionDate, Previous Designation , Current Designation
You can add another class, and return list of the new class. like this
public object GetPromotionReport()
{
List<PromotionHistorywithNames> finalData;
finalData = (from st in db.PromotionHistories
select new PromotionHistorywithNames
{
PromotionID = st.PromotionID,
EmployeeID = st.EmployeeID,
PreviousPost = (from dd in db.Designations where dd.DesignationID == st.Promotion select dd.DesignationName).FirstOrDefault(),
CurrentPost = (from dd in db.Designations where dd.DesignationID == st.currentD select dd.DesignationName).FirstOrDefault()
}).ToList();
return finalData;
}
and the class like this
public class PromotionHistorywithNames{
public int PromotionID{set;get;}
public int EmployeeID{set;get;}
public DateTime Promotion{set;get;}
public string PreviousPost{set;get;}
public string CurrentPost{set;get;}
}
I solved my annonymous type problem by this: It can be done without model class
[HttpGet]
[Route("api/MemberApi/GetMembersWithLink/")]
public object GetMembersWithLink()
{
var member = (from members in db.Members
where members.Status == 1
select new
{
members.MemberName,
members.Position,
members.Phone,
members.Picture,
members.MotherName,
members.Village,
members.Email,
linkName = (from gg in db.Members where gg.MemberID== members.Link select gg.MemberName).FirstOrDefault()
}).ToList();
return member.AsEnumerable();
}
Sort in LINQ
I have 2 database CustomerEntities and BillEntities
I want to get CustomerName from CustomerEntities and sort it but it have no data and I want .ToList() just once time because it slow if used many .ToList()
using (var db1 = new CustomerEntities())
{ using (var db2 = new BillEntities())
{
var CustomerData = db1.Customer.Select(s=> new{s.CustomerCode,s.CustomerName}).ToList();
var BillData = (from t1 in db2.Bill
select new {
BillCode = t1.Billcode,
CustomerCode = t1.Customer,
CustomerName = ""; //have no data
});
}
if(sorting.status==true)
{
BillData= BillData.OrderBy(o=>o.CustomerName); //can't sort because CustomerName have no data
}
var data = BillData .Skip(sorting.start).Take(sorting.length).ToList(); // I want .ToList() just once time because it slow if used many .ToList()
foreach (var b in data)
{
var Customer = CustomerData.FirstOrDefault(f => f.CustomerCode==b.CustomerCode );
if(CustomerName>!=null)
{
r.CustomerName = Customer.CustomerName; //loop add data CustomerName
}
}
}
I have no idea to do it. Help me please
I'm not sure if I understand your code but what about this:
var BillData = (from t1 in db2.Bill
select new {
BillCode = t1.Billcode,
CustomerCode = t1.Customer,
CustomerName = db1.Customer.FirstOrDefault(c => c.CustormerCode == t1.Customer)?.CustomerName
});
Then you have objects in BillData that holds the CustomerName and you can order by that:
BillData.OrderBy(bd => bd.CustomerName);
If you just want to get CustomerName from your customer Db and sort it, this is what i would have used. I used orderByDescending but you can use OrderBy aswell.
public List<Customer> getLogsByCustomerName(string customername)
{
using (var dbentites = new CustomerEntities())
{
var result = (from res in dbentites.Customer.OrderByDescending(_ => _.CustomerName)
where res.CustomerName == customername
select res).ToList();
return result.ToList();
}
}
I have the following LINQ query.
var providers = from c in Repository.Query<Company>()
where !c.IsDeleted
select new { c.Description, Id = "C" + c.Id };
I'm trying to concatenate the ID to "C". So, for example, if c.Id is 35 then the result should be "C35".
This obviously doesn't work because you can't add an integer (c.Id) to a string. I could easily resolve this in C# using string.Format() or converting the type. But how can I do this in LINQ?
Try using SqlFunctions.StringConvert Method:
var xd = (from c in Repository.Query<Company>()
where !c.IsDeleted
select new { c.Description, Id = "C" + SqlFunctions.StringConvert((double)c.Id).Trim()});
When you need functionality of .NET only in preparing the result (as opposed to, say, filtering, which should be done on RDBMS side to avoid bringing too much data in memory) the common trick is to complete the conversion in memory using the AsEnumerable method:
var providers = Repository.Query<Company>()
.Where(c => !c.IsDeleted)
.Select(c => new { c.Description, c.Id }) // <<== Prepare raw data
.AsEnumerable() // <<== From this point it's LINQ to Object
.Select(c => new { c.Description, Id = "C"+c.Id }); // <<== Construct end result
The code that you have written will work fine. Here is a mock up of the same code and it outputs the Id's
class Company
{
public string Description { get; set; }
public int Id { get; set; }
public bool IsDeleted { get; set; }
}
static void Main()
{
//setup
var list = new List<Company>();
list.Add(new Company
{
Description = "Test",
Id = 35,
IsDeleted = false
});
list.Add(new Company
{
Description = "Test",
Id = 52,
IsDeleted = false
});
list.Add(new Company
{
Description = "Test",
Id = 75,
IsDeleted = true
});
/* code you are looking for */
var providers = from c in list
where !c.IsDeleted
select new { c.Description, Id = "C" + c.Id };
foreach (var provider in providers)
{
Console.WriteLine(provider.Id);
}
Console.ReadKey();
}
What about string format
var providers = from c in Repository.Query<Company>()
where !c.IsDeleted
select new { c.Description, Id = "C" + c.Id.ToString() };
I have the following responses from the API. How can I group them into the following structure?
Student[]
- Name
- Classes[]
- ClassName
- ClassId
- ClassCategories[]
- CategoryName
- CategoryWeight
- Assignments[]
- AssignmentName
- Score
I was managed to group them until the "Classes" level but unable to get the ClassCategories for each of the classes
var data = (from result in results
group result by new { result.StudentId, result.FirstName, result.LastName, result.MiddleInitial }
into StudentGroup
select new GroupedStudent
{
StudentId = StudentGroup.Key.StudentId,
FullName = string.Format("{0} {1} {2}", StudentGroup.Key.FirstName, StudentGroup.Key.MiddleInitial, StudentGroup.Key.LastName).Replace(" ", " "),
Classes = from result in results
group result by new { result.ClassId, result.ClassName } into ClassGroup
select new groupedClass
{
ClassName = ClassGroup.Key.ClassName,
ClassId = ClassGroup.Key.ClassId,
ClassCategories = ...
})
}).ToList();
Can anyone please assists me? Thank you.
First, you have make ClassGroup from StudentGroup not from results.
Classes = from s in StudentGroup group result by new { s.ClassId, s.ClassName } into ClassGroup
The complete linq query is as follows:
var data =
(from result in results
group result by new { result.StudentId, result.FirstName, result.LastName, result.MiddleInitial } into StudentGroup
select new
{
StudentId = StudentGroup.Key.StudentId,
FullName = string.Format("{0} {1} {2}", StudentGroup.Key.FirstName, StudentGroup.Key.MiddleInitial, StudentGroup.Key.LastName).Replace(" ", " "),
Classes = (from s in StudentGroup
group s by new { s.ClassId, s.ClassName } into ClassGroup
select new
{
ClassId = ClassGroup.Key.ClassId,
ClassName = ClassGroup.Key.ClassName,
ClassCategories = (from c in ClassGroup
group c by new { c.CategoryName, c.CategoryWeight } into CategoryGroup
select new
{
CategoryName = CategoryGroup.Key.CategoryName,
CategoryWeight = CategoryGroup.Key.CategoryWeight,
Assignments = (from ct in CategoryGroup
group ct by new { ct.AssignmentName, ct.Score } into AssingnmentGroup
select new
{
AssignmentName = AssingnmentGroup.Key.AssignmentName,
Score = AssingnmentGroup.Key.Score
}).ToList()
}).ToList()
}).ToList()
}).ToList();
For example, if you want to access to the first Assignment's score, you can get it like this:
var student = data.FirstOrDefault();
var score = student.Classes[0].ClassCategories[0].Assignments[0].Score;
This is usually how I do It.
Create a class to store your data
Create a list of that class type
In your case instead of string dataRow maybe you can use a sub class
.
// get data from webservice
var json = webClient.DownloadString(url);
var values = JsonConvert.DeserializeObject<JArray>(json);
// create a list to save all the element
List<myClass> classList = new List<myClass>();
// process every row
foreach (string dataRow in values)
{
string[] dataField = dataRow.Split(',');
// have a constructor to assign each value to this element
myClass ctROW = new myClass(dataField);
classList.add(ctROW );
I have a linq query which is working fine.How can i use group by in this query.I need to group by username and itemid and i should get sum(Amount)(All are in table called Carts)
FoodContext db = new FoodContext();
List<CartListing> fd = (from e in db.FoodItems
join o in db.Carts on e.itemid equals o.itemid
where e.itemid == o.itemid
select new CartListing
{
Itemname =e.itemname,
Amount =o.amount,
Price=(float)(e.price*o.amount),
}).ToList();
CartModel vm = new CartModel { CartListings = fd };
I can't see username anywhere in your code example, but to group by Itemname and sum Amount, you would something like:
var grouped = fd.GroupBy(
cl => cl.Itemname,
(key, group) => new CartListing
{
Itemname = key,
Amount = group.Sum(cl => cl.Amount),
Price = group.Sum(cl => cl.Price)
});
To also group by username, just generate a text key containing both values, for instance delimited by a character you know will be contained in neither.
Use:
var grouped = fd.GroupBy((a => new { a.itemid,a.name }) into grp
select new MyClass
{
MyProperty1=grp.key.itemid,
MyProperty2 =grp.Sum(x=>x.whatever)
}
Public MyClass
{
public string MyProperty1 {get;set;}
public int MyProperty2 {get;set;}
}
This way it won't be anonymous