I need to sort my csv file alphabetically and not show the ones that it says "hidden" for (aka. client 4 and client 5) this is the code:
static void Main(string[] args)
{
ReadCSFVFile();
Console.WriteLine();
}
static void ReadCSFVFile()
{
var lines = File.ReadAllLines("Navigation.txt");
var list = new List<Company>();
foreach (var line in lines)
{
var values = line.Split(';' );
var company = new Company() { ID = values[0], MenuName = values[1], ParentID = values[2], IsHidden = values[3], LinkURL = values[4] };
list.Add(company);
}
list.ForEach(x => Console.WriteLine($"{x.ID}\t {x.MenuName}\t {x.ParentID}\t {x.IsHidden}\t {x.LinkURL}"));
}
public class Company
{
public string ID { get; set; }
public string MenuName { get; set; }
public string ParentID { get; set; }
public string IsHidden { get; set; }
public string LinkURL { get; set; }
}
and this is the csv file:
ID;MenuName;ParentID;isHidden;LinkURL
1;Company;NULL;False; /company
2;About Us;1;False; /company/aboutus
3;Mission;1;False; /company/mission
4;Team;2;False; /company/aboutus/team
5;Client 2;10;False; /references/client2
6;Client 1;10;False; /references/client1
7;Client 4;10;True; /references/client4
8;Client 5;10;True; /references/client5
10;References;NULL;False; /references
The below should achieve this for you. I've commented the parts I've added to help out.
list.OrderBy(x => x.MenuName) // Order alphabetically based on MenuName
.Where(x => x.IsHidden != "True") // Filter only for non-hidden items
.ToList().ForEach(
x => Console.WriteLine($"{x.ID}\t {x.MenuName}\t {x.ParentID}\t{x.IsHidden}\t {x.LinkURL}"));
I am trying to retrieve records from a List<T> of List<T> and seek your help in getting it.
I am trying to fetch items where overdues.Accounts.AccountId = 'JKB1' and how can i do it over the below List Items.
public class OverdueModel
{
public string Slab { get; set; }
public double Value { get; set; }
public double Percentage { get; set; }
public List<OverdueSlabAccounts> Accounts { get; set; }
}
public class OverdueSlabAccounts
{
public string AccountId { get; set; }
public string AccountName { get; set; }
public string SalesCode { get; set; }
public string Value { get; set; }
}
void Main(){
List<OverdueModel> overdues = new List<OverdueModel>();
List<OverdueSlabAccounts> accounts = new List<OverdueSlabAccounts>();
//For T3
accounts.Clear();
accounts.Add(new OverdueSlabAccounts()
{
AccountId = "JKB1",
AccountName = "JKB1",
SalesCode = "JKB",
Value = "500"
});
accounts.Add(new OverdueSlabAccounts()
{
AccountId = "JKB2",
AccountName = "JKB2",
SalesCode = "JKB",
Value = "500"
});
overdues.Add(new OverdueModel()
{
Slab = "T3",
Value = 1000,
Percentage = 0,
Accounts = accounts
});
//For T4
accounts.Clear();
accounts.Add(new OverdueSlabAccounts()
{
AccountId = "JKB1",
AccountName = "JKB1",
SalesCode = "JKB",
Value = "1000"
});
overdues.Add(new OverdueModel()
{
Slab = "T4",
Value = 1000,
Percentage = 0,
Accounts = accounts
});
}
You can use Where and Any in combination for this :
var result = overdues
.Where(overdue => overdue.Accounts
.Any(account => account.AccountId == "JKB1"));
This will filter those overdues for which associated any Account has AccountId JKB1
You could use Linq for the purpose
var filteredList = overdues.Where(x=>x.Accounts.Any(c=>c.AccountId=="JKB1"));
For more information on Where and Any
Enumerable.Where : Refer
Enumerable.Any : Refer
Output
You can try this:
var account = accounts.Find(x => x.AccountId.Contains("JKB1")));
or
var account = accounts.Find(x => x.AccountId.Equals("JKB1")));
this will get you the specific account Id you are looking for.
Starting from a table of daily fruit prices
fruits.csv
Day,Name,Kind,Price
2019-09-04,"apple","red",63.09
2019-09-04,"apple","yellow",52.14
2019-09-04,"orange","navel",41.18
2019-09-04,"orange","blood",41.18
2019-09-03,"apple","red",63.07
2019-09-03,"apple","yellow",52.11
2019-09-03,"orange","navel",41.13
2019-09-03,"orange","blood",41.13
I'd like to insert the reference prices by name and kind
fruit_ref_prices.csv
Name,Kind,Reference_Price
"apple","red",60.00
"apple","yellow",50.00
"orange","navel",40.00
"orange","blood",42.00
to result in the following table
Day,Name,Kind,Price,Reference_Price
2019-09-04,"apple","red",63.09,60.00
2019-09-04,"apple","yellow",52.14,50.00
2019-09-04,"orange","navel",41.18,40.00
2019-09-04,"orange","blood",41.18,42.00
2019-09-03,"apple","red",63.07,60.00
2019-09-03,"apple","yellow",52.11,50.00
2019-09-03,"orange","navel",41.13,40.00
2019-09-03,"orange","blood",41.13,42.00
The solution should be simple using C#'s built-in SQL-like syntax, and I'm sure the answer lies in one of the following tutorial pages:
Join clause
Perform custom join operations
Join by using composite keys
but I'm having a hard time identifying the syntax of this language.
In my attempt below instead of writing
join fruit_ref in fruit_refs on fruit.name equals fruit_ref.name
I should be able to write
join fruit_ref in fruit_refs on fruit.name equals fruit_ref.name
and fruit.kind equals fruit_ref.kind
but the Boolean expression is not accepted. Why?
My attempt is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
namespace MyConsoleApplication
{
class Program
{
const string root = #"c:\path\to\here\";
const string file1_in = root + #"fruits.csv";
const string file2_in = root + #"fruit_ref_prices.csv";
static void Main(string[] args)
{
Fruit_Basket fruit_basket = new Fruit_Basket(file1_in, file2_in);
fruit_basket.PrintFruits();
}
}
public class Fruit
{
public DateTime day { get; set; }
public string name { get; set; }
public string kind { get; set; }
public decimal price { get; set; }
public Fruit(DateTime newFruit_day,
string newFruit_name,
string newFruit_kind,
decimal newFruit_price)
{
this.day = newFruit_day;
this.name = newFruit_name;
this.kind = newFruit_kind;
this.price = newFruit_price;
}
}
public class Fruit_Ref
{
public string name;
public string kind;
public decimal reference_price;
public Fruit_Ref(string newName, string newKind, decimal newRef_Price)
{
this.name = newName;
this.kind = newKind;
this.reference_price = newRef_Price;
}
}
public class Fruit_Basket {
public List<Fruit> fruits { get; set; }
public List<Fruit_Ref> fruit_refs { get; set; }
public Fruit_Basket(string file1_in, string file2_in) {
build_fruit_list(file1_in);
build_fruit_ref_list(file2_in);
}
public void build_fruit_list(string file_in)
{
fruits = new List<Fruit>();
int count = 0;
StreamReader reader = new StreamReader(file_in);
string line = "";
while ((line = reader.ReadLine()) != null)
{
if (++count > 1)
{
string[] splitLine = line.Split(new char[] { ',' }).ToArray();
var newFruit_day = DateTime.Parse(splitLine[0]);
var newFruit_name = splitLine[1];
var newFruit_kind = splitLine[2];
var newFruit_price = decimal.Parse(splitLine[3]);
Fruit newFruit = new Fruit(newFruit_day,
newFruit_name,
newFruit_kind,
newFruit_price);
fruits.Add(newFruit);
}
}
reader.Close();
}
public void build_fruit_ref_list(string file_in)
{
fruit_refs = new List<Fruit_Ref>();
int count = 0;
StreamReader reader = new StreamReader(file_in);
string line = "";
while ((line = reader.ReadLine()) != null)
{
if (++count > 1)
{
string[] splitLine = line.Split(new char[] { ',' }).ToArray();
var newFruit_name = splitLine[0];
var newFruit_kind = splitLine[1];
var newFruit_ref_price = decimal.Parse(splitLine[2]);
Fruit_Ref newFruit_ref = new Fruit_Ref(newFruit_name,
newFruit_kind,
newFruit_ref_price);
fruit_refs.Add(newFruit_ref);
}
}
reader.Close();
}
public void PrintFruits()
{
var innerJoinQuery =
from fruit in fruits
join fruit_ref in fruit_refs on fruit.name equals fruit_ref.name
select new { Day = fruit.day, Name = fruit.name, Kind = fruit.kind,
Price = fruit.price, Reference_Price = fruit_ref.reference_price };
Console.WriteLine($#"""Date"",""Name"",""Kind"",""Price"",""Ref Price""");
foreach (var i in innerJoinQuery)
{
Console.WriteLine($#"{i.Day},{i.Kind},{i.Price},{i.Reference_Price}");
}
}
}
}
You could also refactor your code to use the CsvHelper NuGet package for reading/writing CSV files.
First, You can make these classes to reflect the fruits, fruit references and final fruit structure.
public class Fruit
{
public string Day { get; set; }
public string Name { get; set; }
public string Kind { get; set; }
public string Price { get; set; }
}
public class FruitReferencePrice
{
public string Name { get; set; }
public string Kind { get; set; }
public string Reference_Price { get; set; }
}
public class FruitFinal
{
public string Day { get; set; }
public string Name { get; set; }
public string Kind { get; set; }
public string Price { get; set; }
public string ReferencePrice { get; set; }
public override string ToString()
{
return $"Day={Day},Name={Name},Kind={Kind},Price={Price},Reference_Price={ReferencePrice}";
}
}
Then you can make two methods to return the rows of each CSV file into List<Fruit> and List<FruitReferencePrice>.
private static IEnumerable<Fruit> BuildFruitList(string csvFilePath)
{
if (!File.Exists(csvFilePath))
{
throw new FileNotFoundException("Could not locate CSV at path " + csvFilePath, csvFilePath);
}
try
{
using var fileReader = File.OpenText(csvFilePath);
using var csv = new CsvReader(fileReader);
return csv.GetRecords<Fruit>().ToList();
} catch (Exception ex)
{
Console.WriteLine(ex.Message);
return Enumerable.Empty<Fruit>();
}
}
private static IEnumerable<FruitReferencePrice> BuildFruitReferenceList(string csvFilePath)
{
if (!File.Exists(csvFilePath))
{
throw new FileNotFoundException("Could not locate CSV at path " + csvFilePath, csvFilePath);
}
try
{
using var fileReader = File.OpenText(csvFilePath);
using var csv = new CsvReader(fileReader);
return csv.GetRecords<FruitReferencePrice>().ToList();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return Enumerable.Empty<FruitReferencePrice>();
}
}
Then you can perform a grouped join and output the merged result.
var path1 = "PATH\\fruits.csv";
var path2 = "PATH\\fruit_ref_prices.csv";
var fruitList = BuildFruitList(path1);
var fruitReferencePrices = BuildFruitReferenceList(path2);
var groupedJoin = from fruit in fruitList
join fruit_ref in fruitReferencePrices
on new { fruit.Name, fruit.Kind } equals new { fruit_ref.Name, fruit_ref.Kind }
select new FruitFinal
{
Day = fruit.Day,
Name = fruit.Name,
Kind = fruit.Kind,
Price = fruit.Price,
ReferencePrice = fruit_ref.Reference_Price
};
foreach (var fruit in groupedJoin)
{
Console.WriteLine(fruit.ToString());
}
Merged results:
Day=2019-09-04,Name=apple,Kind=red,Price=63.09,Reference_Price=60.00
Day=2019-09-04,Name=apple,Kind=yellow,Price=52.14,Reference_Price=50.00
Day=2019-09-04,Name=orange,Kind=navel,Price=41.18,Reference_Price=40.00
Day=2019-09-04,Name=orange,Kind=blood,Price=41.18,Reference_Price=42.00
Day=2019-09-03,Name=apple,Kind=red,Price=63.07,Reference_Price=60.00
Day=2019-09-03,Name=apple,Kind=yellow,Price=52.11,Reference_Price=50.00
Day=2019-09-03,Name=orange,Kind=navel,Price=41.13,Reference_Price=40.00
Day=2019-09-03,Name=orange,Kind=blood,Price=41.13,Reference_Price=42.00
Please change the equals clause as on new { fruit.name, fruit.kind } equals new { fruit_ref.name, fruit_ref.kind }
Why you require this
The query has two anonymous types (one for left table and one for right table). So to compare those anonymous types, the linq statement should use new keyword
Query :
var innerJoinQuery = from fruit in fruits
join fruit_ref in fruit_refs on new { fruit.name, fruit.kind } equals new { fruit_ref.name, fruit_ref.kind }
select new { Day = fruit.day, Name = fruit.name, Kind = fruit.kind,
Price = fruit.price, Reference_Price = fruit_ref.reference_price };
I have a csv file that looks like this:
M;2017.12.01 17:04;1;example#example.com
T;1;K001;2
T;1;N001;1
M;2017.11.01 15:56;2;example#example.com
T;2;P001;2
T;2;P001;1
My problem is that I have to read this file into a List<> and be able to navigate in it with indexes but the different types of rows after the long ones are confusing me.
class Order
{
public string Type { get; set; }
public DateTime Date { get; set; }
public string OrderID { get; set; }
public string Email { get; set; }
public string ItemNumber { get; set; }
public int Quantity { get; set; }
public Order(string[] ordered , string[] items)
{
Type = ordered[0];
Date = DateTime.Parse(ordered[1]);
OrderID = ordered[2];
Email = ordered[3];
Type = items[0];
OrderID = items[1];
ItemNumber = items[2];
Quantity = int.Parse(items[3]);
}
}
class Program
{
static List<Order> orders = new List<Order>();
static void Main(string[] args)
{
Reading();
}
private static void Reading()
{
using (System.IO.StreamReader reader = new System.IO.StreamReader("orders.csv"))
{
while (!reader.EndOfStream)
{
orders.Add(new Order(reader.ReadLine().Split(';') , reader.ReadLine().Split(';')));
}
}
}
}
You can try to identify the line before creating it.
Than you can create two different methods to initialize your order.
while (!reader.EndOfStream)
{
var values = reader.ReadLine().Split(';');
if(DateTime.TryParse(values.Skip(1).First(), out var date)) {
orders.Add(Order.FromOrderWithDate(values));
}
else
orders.Last().Items.Add(Item.FromOrderWithEmail(values));
}
The two methods will be something like
public static Order FromRow(string[] ordered) =>
new Order {
Type = ordered[0],
Date = DateTime.Parse(ordered[1]),
OrderID = ordered[2],
Email = ordered[3],
Items = new List<Item>();
};
public static Item FromRow(string[] items) =>
new Item {
Type = items[0],
OrderID = items[1],
ItemNumber = items[2],
Quantity = int.Parse(items[3])
};
And finally two different class, one for order and one for item, the Order should contain a list for the items.
Try something like:
List<Customer> customers = new List<Customer>();
Customer lastCustomer = null;
foreach(var line in File.ReadLines("orders.csv"))
{
var values = line.Split(';');
if (values[0]=="M")
{
lastCustomer = new Customer(values);
customes.Add(lastCustomer);
}
else if (values[0]=="T" && lastCustomer != null)
{
lastCustomer.AddOrder(values);
}
}
(you'll need to write a Customer class that can construct its self from an array of strings, plus has a method for adding new Order objects to its own list of orders, again constructing them from an array)
I maintain an API that, based on a request for a list of people, returns a different result set based on the request. For example, some API clients want to get a list of people and a list of their interactions, others want people and a list of their metadata. All this can be specified int he request to the API method that returns people.
This does not appear to work:
using (var dbcontext = new ExampleEntities())
{
var query = dbcontext.People.AsQueryable();
//determined in earlier application logic based on request
if(includeMetadata)
{
query = query.Include("metadata");
}
//determined in earlier application logic based on request
if(includeInteractions)
{
query = query.Include("interactions");
}
/* ...SNIP... */
}
What I don't want to do is this:
var query = dbcontext.People.Include("Metadata").Include("interactions");
which will mean every request to get a person will include ALL their related entities, even if the requesting API client does not need them.
I also don't want to code every possible combination of logic:
if(includeMetadata && includeInteractions)
{
var query = dbcontext.People.Include("Metadata").Include("interactions");
}
else if(includeMetadata)
{
var query = dbcontext.People.Include("Metadata");
}
else if(includeInteractions)
{
var query = dbcontext.People.Include("Interactions");
}
else
{
var query = dbcontext.People;
}
This will result in hard-to-maintain code, however, I realize I could code generate this if needed.
You can chain the IQueryable's
using (var dbcontext = new ExampleEntities())
{
var query = dbcontext.People.AsQueryable();
if(includeMetadata)
{
query = query.Include("metadata");
}
if(includeInteractions)
{
query = query.Include("interactions");
}
}
Your first example should work if you replace u with query
u = u.Include("metadata");
with
query = query.Include("metadata");
Works fine here... checking the sql statements with the EF 6 Log handler
[TestClass]
public void SomeTestClass
{
[TestMethod]
public void ShouldLoadOnlyRequiredCollections()
{
Database.SetInitializer(new DropCreateDatabaseAlways<HomesContext>());
var db = new HomesContext();
Assert.IsFalse(db.Homes.Any());
var home = db.Homes.Create();
db.Homes.Add(home);
home.Staff.Add(new Staff { Name = "wilma" });
home.Staff.Add(new Staff { Name = "betty" });
home.Residents.Add(new Resident { Name = "fred" });
home.Residents.Add(new Resident { Name = "barney" });
db.SaveChanges();
db = null;
Database.SetInitializer(new DropCreateDatabaseIfModelChanges<HomesContext>());
var sb = new StringBuilder();
db = new HomesContext();
db.Database.Log = ((s) => { sb.Append(s + "\r"); });
Assert.IsTrue(db.Homes.Any());
string log;
log = sb.ToString();
Assert.IsTrue(sb.ToString().Contains("FROM [dbo].[Homes]"));
sb = new StringBuilder(); //ok get residents
var q = db.Homes.Include("Residents");
Assert.IsTrue(string.IsNullOrEmpty(sb.ToString()));
var lst = q.ToList();
log = sb.ToString();
Assert.IsTrue(sb.ToString().Contains("[dbo].[Homes]"));
Assert.IsTrue(sb.ToString().Contains("[dbo].[Residents]"));
Assert.IsTrue(!sb.ToString().Contains("[dbo].[Staff]"));
sb = new StringBuilder(); //get staff
q = db.Homes.Include("Staff");
Assert.IsTrue(string.IsNullOrEmpty(sb.ToString()));
lst = q.ToList();
log = sb.ToString();
Assert.IsTrue(log.Contains("[dbo].[Homes]"));
Assert.IsTrue(!log.Contains("[dbo].[Residents]"));
Assert.IsTrue(log.Contains("[dbo].[Staffs"));
sb = new StringBuilder(); //get residents and staff
q = db.Homes.Include("Staff");
q = q.Include("Residents");
lst = q.ToList();
log = sb.ToString();
Assert.IsTrue(log.Contains("[dbo].[Homes]"));
Assert.IsTrue(log.Contains("[dbo].[Residents]"));
Assert.IsTrue(log.Contains("[dbo].[Staffs]"));
}
}
public class HomesContext:DbContext
{
public DbSet<Home> Homes { get; set; }
}
public class Home
{
public Home()
{
Staff = new List<Staff>();
Residents = new List<Resident>();
}
public int HomeId { get; set; }
public string HomeName { get; set; }
public int MaxResidents { get; set; }
public int MaxStaff { get; set; }
public int CurrentResidents { get; set; }
[NotMapped]
public int CurrentStaff { get; set; }
public IList<Staff> Staff { get; set; }
public IList<Resident> Residents { get; set; }
}
public class Staff
{
public int StaffId { get; set; }
public string Name { get; set; }
public int HomeId { get; set; }
public Home Home { get; set; }
}
public class Resident
{
public int ResidentId { get; set; }
public string Name { get; set; }
public int HomeId { get; set; }
public Home Home { get; set; }
}