How to increase capacity of collectionbase automatticly?

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C#

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

namespace Collectionsexample
{
    class Program
    {
        static void Main(string[] args)
        {
            car[] banchcars = new car[5];
            banchcars[0] = new car();
            banchcars[0].count = 1;
            banchcars[0].name = "bmw";
            banchcars[0].type = "hatchback";
            ArrayList banchofbanchescar = new ArrayList();
            passengers[] banchpassengers = new passengers[5];
            banchofbanchescar.Add(banchpassengers);
            banchofbanchescar.Add(banchcars);
            ArrayList banchofbanchofcars = new ArrayList();
            somelist someexampleofcollectionbase = new somelist();
            car Mersedes = new car();
            Mersedes.count = 1;
            Mersedes.name = "Mersedes";
            Mersedes.type = "sedan";
            someexampleofcollectionbase.newcar(Mersedes);
            car Lincoln = new car();
            Lincoln.count = 1;
            Lincoln.name = "Lincoln";
            Lincoln.type = "sedan";
            someexampleofcollectionbase.newcar(Lincoln);
            someexampleofcollectionbase.newcar(Mersedes);
            Console.WriteLine(someexampleofcollectionbase[0].name);
            Console.WriteLine(someexampleofcollectionbase[1].name);
            Console.Read();
        }
    }
    class car
    {
        public int count;
        public string name;
        public string type;
    }
    class passengers
    {
        public string name;
        public int sex;
        public int weight;
    }
    class somelist : CollectionBase
    {
        public int Capacity 
        {
            get
            {
                return 5;
            }
            set
            {
            }
        }
        public string showinfo(car infoaboutcar)
        {
           return infoaboutcar.name;
        }
        public void newcar(car Newcar)
        {
            List.Add(Newcar);
        }
        public car this[int a]
        {
            get
            {
                return (car)List[a];
            }
            set
            {
                List[a] = value;
            }
        }
        
    }
}

I wrote some code i changed capacity manually by property

C#

public int Capacity
        {
            get
            {
                return 5;
            }
            set
            {
            }
        }

Is it possible to increase capacity by adding new members into collection?

Posted 23-Nov-14 22:56pm

Inimicos

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3 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Kornfeld Eliyahu Peter · Accepted Answer · 2014-11-23T23:17:00

Solution 1

MSDN:
... the capacity is automatically increased by reallocating the internal array before copying the old elements and adding the new elements.

http://msdn.microsoft.com/en-us/library/system.collections.collectionbase.capacity(v=vs.110).aspx[^]

Posted 23-Nov-14 23:17pm

Kornfeld Eliyahu Peter

Comments

Inimicos 24-Nov-14 5:38am

Yes i know,but i got error,out of range,without capacity property.

Maciej Los · Accepted Answer · 2014-11-23T23:19:00

I won't say you're doing it wrong, but you need to re-think it. Please, read this:
Walkthrough: Creating Your Own Collection Class[^]

Your class inherits from CollectionBase, so:

C#

class somelist : CollectionBase
    {
        public int Capacity
        {
            get
            {
                return List.Count();
            }

would do the work.

I do not recommend to use arrays. Use List<T> instead. See: List<T> Class[^]

OriginalGriff · Accepted Answer · 2014-11-23T23:22:00

Why do you think that adding a property to return a fixed number is going to affect the limit on number of items in the underlying class? All you will do is get a warning from the compiler to say "you are hiding this inherited member". It doesn't affect the underlying class in any way.

The Capacity of a collection is not a limit on how many elements it can contain: it is a "warning" that exceeding this will cause a small delay while the capacity is increased.

For example, a collection might be implemented with an array and start with a capacity of 8: when you add the 9th item, it allocates a new array of 16 items, and copies the existing 8 over before adding the 9th. When you add the 17th, it does the same but this time allocates 32 "spaces"

If you want to restrict your collection to a specific size, you will need to override the Add method(s) and decide what to do when the user tries to exceed your limit.

How to increase capacity of collectionbase automatticly?

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How to increase capacity of collectionbase automatticly?

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