How to increase capacity of collectionbase automatticly?

Question

0.00/5 (No votes)

See more:

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

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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?

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0