Provera duplikata u kolekciji (FOREACH, LINQ ANY, LINQ ALL)

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Mon Sep 26 2022 08:33:41 GMT+0000 (Coordinated Universal Time)

Saved by @necamat #c#

// FOREACH
public static bool ContainsDuplicates < T > ( this IEnumerable < T > enumerable )
{
    HashSet < T > knownElements = new ( ) ;
    foreach ( T element in enumerable )
   {
     if ( ! knownElements.Add ( element ) )
       {
         return true ;
       }
     
    }                              
    return false ;
}
//HashSet . Add returns false if the element is already present

//LINQ ANY
public static bool ContainsDuplicates < T > ( this IEnumerable < T > enumerable )
{ 
    HashSet < T > knownElements = new ( ) ;
    return enumerable.Any(element => !knownElements.Add(element));
}

//LINQ ALL
public static bool ContainsDuplicates < T > ( this IEnumerable < T > enumerable )
{ 
    HashSet < T > knownElements = new ( ) ;
    return !enumerable.All(knownElements.Add);
}


// primena
List < int > numbers = new ( ) { 1 , 2 , 3 , 3 , 4 , 5 } ;
  if ( numbers.ContainsDuplicates ( ) )
{  
    // Do something when there are duplicates
}

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@necamat

Provera duplikata u kolekciji (FOREACH, LINQ ANY, LINQ ALL) Memory Cache Citanje JSON datoteka(i ziponovanih) preko strima

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[SOLVED] - Blazor onchange event with select dropdown

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@code {
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Unity Convert LocalSpace to WorldSpace

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Unity (C#) equivalent of SetInterval()

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I want Input text file in sap using c#

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

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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; }

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

namespace GoodTimes.Models
{
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        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; }
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Class Reserveren

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

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

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        public string Medewerker { get; set; }
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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
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        public DbSet<GoodTimes.Models.Categorie> Categorie { get; set; }
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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace GoodTimes.Models
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        //public int BonId { get; set; }
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using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

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

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

namespace GoodTimes.Models
{
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        public int Volgorde { get; set; }

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

#c# #loops #for

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace StarPattern
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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();
}
}
}

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