How to Update Members of a Collection with LINQ -- Visual Studio Magazine

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Mon Jul 04 2022 19:42:53 GMT+0000 (Coordinated Universal Time)

Saved by @dhfinch #c# #linq #lambda #extensionmethod

public static class PHVExtensions
{
    public static IEnumerable<T> SetValue<T>(this IEnumerable<T> items, Action<T>
         updateMethod)
    {
        foreach (T item in items)
        {
            updateMethod(item);
        }
        return items;
    }
}

/*
With that method in place, I can write my statement like this:
customers.Where(c => c.IsValid).SetValue(c => c.CreditLimit = 1000).ToList();

Or like this:
var newCustomers = customers.Where(c => c.IsValid).SetValue(c => c.CreditLimit = 1000);

Or like this for Entity Framework:
db.Customers.Where(c => c.IsValid).ToList().SetValue(c => c.CreditLimit = 1000);
*/

COPY

I can write an extension method of my own that will attach itself to any collection that implements the IEnumerable interface. My extension method will, in turn, accept a lambda expression that accepts an object out of the collection. Within my extension method, I can loop through the collection my method has been called from. Within that loop, I'll call the lambda expression that's been passed in to my method, passing the lambda expression each object from the collection. Finally, I can return the updated collection:

https://visualstudiomagazine.com/articles/2019/07/01/updating-linq.aspx

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Comments

C#

@dhfinch

How to Update Members of a Collection with LINQ -- Visual Studio Magazine switch pattern matching Add WriteLine extension method to TextBox Here is code which I am using which you can utilize to map a network drive programmatically: C# set form Icon from resources Open an external application INSIDE the form or panel Alternate Data Streams in C

#blazor #c# #html

[SOLVED] - Blazor onchange event with select dropdown

@inject HttpClient httpClient

@if (States != null)
{

<select id="SearchStateId" name="stateId" @onchange="DoStuff" class="form-control1">
    <option>@InitialText</option>
    @foreach (var state in States)
    {
        <option value="@state.Name">@state.Name</option>
    }
</select>
}


@code {
[Parameter] public string InitialText { get; set; } = "Select State";
private KeyValue[] States;
private string selectedString { get; set; }
protected override async Task OnInitializedAsync()
{
    States = await httpClient.GetJsonAsync<KeyValue[]>("/sample-data/State.json");
}

private void DoStuff(ChangeEventArgs e)
{
    selectedString = e.Value.ToString();
    Console.WriteLine("It is definitely: " + selectedString);
}

public class KeyValue
{
    public int Id { get; set; }

    public string Name { get; set; }
}
}

#c#

Unity Convert LocalSpace to WorldSpace

//You need this because ur velocity is in localSpace
//This works if you start the game at 0,0,0 rotation,
//what if you start the game at 0,180,0 rotation?  
//Then your up arrow will move you backwards.


//Get inputs
float horzInput = Input.GetAxis("Horizontal");
float vertInput = Input.GetAxis("Vertical");

//Calc Velocity
Vector3 direction = new Vector3(horzInput, 0.0f, vertInput);
Vector3 velocity = direction * _speed;

//Gravity
velocity.y -= _gravity;

//Convert localSpace velocity to worldSpace
velocity = transform.transform.TransformDirection(velocity); //<-Weimberger's way
velocity = transform.TransformDirection(velocity); //<-myWay

//Move
_controller.Move(velocity * Time.deltaTime);

#c#

Unity (C#) equivalent of SetInterval()

void Start(){ 
  StartCoroutine(SpawnObject()); 
}

IEnumerator SpawnObject(){
  while (true){
    yield return new WaitForSeconds(1.0f); // every 1 second
    Instantiate(objectToSpawn);
  }
}

#C# #c#

I want Input text file in sap using c#

   foreach (string line in lines)
            {
                string[] a = line.Split('|');
                oDocumentSQ.DocNum = Convert.ToInt32(a[0]);
                oDocumentSQ.CardCode = a[1];
                oDocumentSQ.NumAtCard = a[2];
                oDocumentSQ.DocDate = Convert.ToDateTime(a[3]);

                oDocumentSQ.Lines.ItemCode = a[4];
                oDocumentSQ.Lines.UnitPrice = Convert.ToDouble(a[5]);
                oDocumentSQ.Lines.Quantity = Convert.ToInt32(a[6]);
                oDocumentSQ.Lines.VatGroup = a[7];
                oDocumentSQ.Lines.Add();             
            }

#C# #c# #array #dictionary

How to clear item not input when count frequency use Dictionary C#

for (int i = 0; i < n; i++)
{
    if (valCount.ContainsKey(x))
        valCount[x]++;
    else
        valCount[x] = 1;
}

#c#

NuGet Gallery | DocumentFormat.OpenXml 2.11.0

Install-Package DocumentFormat.OpenXml -Version 2.11.0

#c#

How to initialize a dictionary with a collection initializer - C# Programming Guide | Microsoft Docs

public class HowToDictionaryInitializer
{
    class StudentName
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int ID { get; set; }
    }

    public static void Main()
    {
        var students = new Dictionary<int, StudentName>()
        {
            { 111, new StudentName { FirstName="Sachin", LastName="Karnik", ID=211 } },
            { 112, new StudentName { FirstName="Dina", LastName="Salimzianova", ID=317 } },
            { 113, new StudentName { FirstName="Andy", LastName="Ruth", ID=198 } }
        };

        foreach(var index in Enumerable.Range(111, 3))
        {
            Console.WriteLine($"Student {index} is {students[index].FirstName} {students[index].LastName}");
        }
        Console.WriteLine();		

        var students2 = new Dictionary<int, StudentName>()
        {
            [111] = new StudentName { FirstName="Sachin", LastName="Karnik", ID=211 },
            [112] = new StudentName { FirstName="Dina", LastName="Salimzianova", ID=317 } ,
            [113] = new StudentName { FirstName="Andy", LastName="Ruth", ID=198 }
        };

        foreach (var index in Enumerable.Range(111, 3))
        {
            Console.WriteLine($"Student {index} is {students2[index].FirstName} {students2[index].LastName}");
        }
    }
}

#c#

Class

public int Id { get; set; }

        [Required]
        public string Klant { get; set; }

        [DataType(DataType.EmailAddress)]
        public string Email { get; set; }

        [DataType(DataType.PhoneNumber)]
        public string Telefoonnummer { get; set; }

        [Required]
        public int Aantalpersonen { get; set; }

        [Required]
        [DataType(DataType.Date)]
        public DateTime Datum { get; set; }

        [Required]
        [DataType(DataType.Time)]
        public DateTime Begintijd { get; set; }

        [Required]
        [DataType(DataType.Time)]
        public DateTime Eindtijd { get; set; }

        [DataType(DataType.MultilineText)]
        public string Opmerkingen { get; set; }
        public string Medewerker { get; set; }
        public DateTime AanmaakDatum { get; set; }

#c#

Class Bon

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
{
    public class Bon
    {
        public int Id { get; set; }
        public int Tafelnr { get; set; }
        public DateTime Bezoek { get; set; }
        public string Medewerker { get; set; }
        public int Bonnummer { get; set; }

        public List<BonRegel> BonRegels { get; set; }

        public List<Bestelling> Bestellings { get; set; }
    }
}

#c#

Class Reserveren

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
{
    public class Reserveren
    {
        public int Id { get; set; }

        [Required]
        public string Klant { get; set; }

        [DataType(DataType.EmailAddress)]
        public string Email { get; set; }

        [DataType(DataType.PhoneNumber)]
        public string Telefoonnummer { get; set; }

        [Required]
        public int Aantalpersonen { get; set; }

        [Required]
        [DataType(DataType.Date)]
        public DateTime Datum { get; set; }

        [Required]
        [DataType(DataType.Time)]
        public DateTime Begintijd { get; set; }

        [Required]
        [DataType(DataType.Time)]
        public DateTime Eindtijd { get; set; }

        [DataType(DataType.MultilineText)]
        public string Opmerkingen { get; set; }
        public string Medewerker { get; set; }
        public DateTime AanmaakDatum { get; set; }
    }
}

#c#

ApplicationDbContext

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using GoodTimes.Models;

namespace GoodTimes.Data
{
    public class ApplicationDbContext : IdentityDbContext
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }
        public DbSet<GoodTimes.Models.Reserveren> Reserveren { get; set; }
        public DbSet<GoodTimes.Models.Menukaart> Menukaart { get; set; }
        public DbSet<GoodTimes.Models.Categorie> Categorie { get; set; }
        public DbSet<GoodTimes.Models.Product> Product { get; set; }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
            builder.Entity<Menukaart>().HasData(
                new Menukaart
                {
                    Id = 1,
                    Naam = "Lunchkaart"
                },
                new Menukaart
                {
                    Id = 2,
                    Naam = "Dinerkaart"
                },
                new Menukaart
                {
                    Id = 3,
                    Naam = "Drankenkaart"
                }
            );
        }

        public DbSet<GoodTimes.Models.Bestelling> Bestelling { get; set; }

        //public DbSet<GoodTimes.Models.Bon> Bon { get; set; }

        //public DbSet<GoodTimes.Models.BonRegel> BonRegel { get; set; }
    }
}

#c#

Bestelling

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
{
    public class Bestelling
    {
        public int Id { get; set; }
        public int Tafelnummer { get; set; }
        public int Aantal { get; set; }
        [DataType(DataType.MultilineText)]
        public string Opmerkingen { get; set; }
        public string Medewerker { get; set; }
        public DateTime Plaatsing { get; set; }
        public bool IsGereed { get; set; }

        //public List<BonRegel> BonRegels { get; set; }

        //public int BonId { get; set; }
        //public Bon Bon { get; set; }
    }
}

#c#

Categorie

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
{
    public class Categorie
    {
        public int Id { get; set; }
        [Required]
        public string Naam { get; set; }
        public int Volgorde { get; set; }

        public int MenukaartId { get; set; }
        public Menukaart Menukaart { get; set; }

        public List<Product> products { get; set; }
    }
}

#c#

Product

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
{
    public class Product
    {
        public int Id { get; set; }
        [Required]
        public string Naam { get; set; }
        [Required]
        [DataType(DataType.MultilineText)]
        public string Omschrijving { get; set; }
        [Required]
        public double Prijs { get; set; }
        public int Volgorde { get; set; }

        public int CategorieId { get; set; }
        public Categorie categorie { get; set; }
    }
}

#c# #loops #for

"*" pattern C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace StarPattern
{
class Program
{
static void Main(string[] args)
{
int x, y, z;
for (x =6; x >= 1; x--)
{
for (y = 1; y < x; y++)
{
Console.Write(" ");
}
for (z = 6; z >= x; z--)
{
Console.Write("*");
}
Console.WriteLine();
}
Console.ReadLine();
}
}
}

How to Update Members of a Collection with LINQ -- Visual Studio Magazine

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How to Update Members of a Collection with LINQ -- Visual Studio Magazine

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