Condense a list - C# Discussion Boards

Re: C# Creating a class and assigning properties to it.

Darrall24-Dec-09 4:26

24-Dec-09 4:26

Thanks Luc. I can see where the book I am using leaves something to be desired. The information you have given me helps immensely and I think I can wade through it now.

Thanks again Smile | :)

Re: C# Creating a class and assigning properties to it.

#realJSOP23-Dec-09 21:56

#realJSOP

23-Dec-09 21:56

I suggest that you read this CodeProject article[^] to get a grasp of object oriented programming.

(Wait until you find out that C# lets you define a a type and a property with exactly the same. That'll fry your brain.)

.45 ACP - because shooting twice is just silly
-----
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Re: C# Creating a class and assigning properties to it.

Darrall24-Dec-09 4:52

Darrall

24-Dec-09 4:52

Thanks for your reply John. The article you directed me to is great!

Thanks again Smile | :)

Re: C# Creating a class and assigning properties to it.

Richard MacCutchan23-Dec-09 22:28

Richard MacCutchan

23-Dec-09 22:28

I notice that Luc suggests your book may not be the best teaching aid. I used .Net Book Zero[^] by Charles Petzold, to learn C# fundamentals and can recommend it for any beginner.

Re: C# Creating a class and assigning properties to it.

Darrall24-Dec-09 4:59

Darrall

24-Dec-09 4:59

Thanks for your reply Richard. I downloaded the book and it looks like it will be a great help.

Thanks again Smile | :)

Re: C# Creating a class and assigning properties to it.

hamed-vojdani24-Dec-09 5:27

hamed-vojdani

24-Dec-09 5:27

I don't understand your question completely but this may be help Smile | :)

1- C# is case sensitive , mean that double Radius; and public double radius are not same.

2- Properties is not variable, it's a way for set or get a variable , and variable can be different type from it's properties like:

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

namespace circle
{
    class circle
    {
        double Radius;
        public string radius
        {
            get 
            {
                return Radius.ToString(); 
            }
            set 
            {
                double i = -1;
                if (double.TryParse(value, out i))
                {
                    Radius = i;
                }                
            }
        }

        public string Circumference
        {
            get
            {
                return (2 * Math.PI * Radius).ToString("N6");
            }
        }
    }

    class MyApp
    {
        public static void Main()
        {
            circle myCircle = new circle();
            myCircle.radius = Console.ReadLine();

            Console.WriteLine("Radius: = {0}", myCircle.radius);
            Console.WriteLine("Circumference: = {0}", myCircle.Circumference);

        }
    }
}

3- Properties is not only for return existing variable, it can do process for calculating or formatting return value like Circumference properties in above code

4- Properties can be readonly like Circumference properties which you can not set a value for it

Hope helps with this ugly sample code Wink | ;)

Re: C# Creating a class and assigning properties to it.

Darrall24-Dec-09 5:39

Darrall

24-Dec-09 5:39

Thank you for your reply. You helped very much with your example. I am starting to understand it now.

Thanks again Smile | :)

Condense a list

o m n i23-Dec-09 11:57

o m n i

23-Dec-09 11:57

I have a list of a custom type that contains 2 variables. One is name, the other is count. What is the general idea of what I need to do in order to condense this into a list with no duplicates where the counts of duplicate names are added together?

(eg. A list with 3 carls, 2 carls, 1 eric, 1 alex and 1 eric should condense to 5 carls, 2 ercis, 1 alex)

An example of the class the list would be populated with:

public class Person
    {
        private string _name;

        public string PersonName
        {
            get {return _name;}
            set { _name = value;}
        }

        private int _count;

        public int PersonCount
        {
            get { return _count; }
            set { _count = value; }
        }

        public Person(string name, int count)
        {
            _count = count;
            _name = name;
        }

    }

Re: Condense a list

Luc Pattyn23-Dec-09 12:07

Luc Pattyn

23-Dec-09 12:07

and is that a problem? There are many ways to do it:

1.
avoid duplicates from the start; that is the cheapest solution. See also (4)

2.
use two nested for loops, and merge entries with identical names (one gets the sum, the other gets removed)

3.
for better performance, you could sort the list on the name (this[^] may help), then do as in (2)

4.
create a new list which never holds any duplicates; the easiest way to do that is by using a Dictionary where name would be the key, and count the value.

You'll have to choose one and work out the details yourself.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Condense a list

o m n i23-Dec-09 12:32

o m n i

23-Dec-09 12:32

Thanks got it working.

General issue: When application doesn't have focus, and you click a button on it, it doesn't register....

sherifffruitfly23-Dec-09 11:03

sherifffruitfly

23-Dec-09 11:03

You have to click the button twice to get the desired button effect - once to give the application focus, and then once to actually fire the buttonclick event, I assume.

Is there a general approach that's applicable to all (or the vast majority) of controls, so that one click on a button/control suffices to trigger the click event, whether or not the app has focus at the time of the click?

Re: General issue: When application doesn't have focus, and you click a button on it, it doesn't register....

Ravi Bhavnani23-Dec-09 14:01

Ravi Bhavnani

23-Dec-09 14:01

sherifffruitfly wrote:
You have to click the button twice to get the desired button effect - once to give the application focus, and then once to actually fire the buttonclick event, I assume.

I've noticed this in .NET apps (and MS Office apps running on WinXP and above). My MFC 4.2 (VC6) apps (running on all OSs) work as you would expect - clicking a toolbar button activates the window and causes the button's handler code to execute.

You might want to try handling the WM_MOUSEACTIVATE event in your application's top level Form and posting a WM_LBUTTONDOWN to the Control under the mouse (if any).

Good luck!

/ravi

My new year resolution: 2048 x 1536
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ravib(at)ravib(dot)com

Reflection Get Access Modifier

dataminers23-Dec-09 9:02

dataminers

23-Dec-09 9:02

Assembly assem = Assembly.LoadFrom("pFile");
Type[] types = assem.GetTypes();

string className = types[0].Name; //This row get class name

How can I get class access modifier?

Thanks..

Re: Reflection Get Access Modifier

Luc Pattyn23-Dec-09 9:45

Luc Pattyn

23-Dec-09 9:45

There is a set of IsXxx properties (e.g. IsPublic) but their mapping onto the C# keywords isn't really clear to me.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Reflection Get Access Modifier

dataminers24-Dec-09 0:50

dataminers

24-Dec-09 0:50

I know, I get public access modifier;

private string GetClassAccessModifier(Type pClass)
{
if (pClass.IsPublic)
return "public ";
}

But how can I get internal and private modifier.

Non exist following properties;

pClass.IsInternal
pClass.IsPrivate
pClass..IsAssembly

can i dynamicly access object from name of object

combo_ci23-Dec-09 6:20

combo_ci

23-Dec-09 6:20

hi i have 2 form in my program
publis object from form2 for example "Frm_User" that new in load of mainform and have a filed for example "AllowEdit"
i can access to this filed by Frm_User.AllowEdit
but i want to find a way that access "AllowEdit" by know name of this filed in other form

it mean that i want find a way to dynamically access obj of form2 "Frm_User" by Name and then change that field in mainForm

can any one help me

thnx

Re: can i dynamicly access object from name of object

Jordon4Kraftd23-Dec-09 10:13

Jordon4Kraftd

23-Dec-09 10:13

Have you tried casting the object?

If the object is different everytime and you can't edit the objects to use an interface with "allowEdit" then maybe you can try using "reflection" methods to get access.

Look up those things then ask for specific help.

Re: can i dynamicly access object from name of object

combo_ci23-Dec-09 18:49

combo_ci

23-Dec-09 18:49

i know with reflection we can access all property and method with the instance of the object
but my problem is i want to create instance of instance of the object from a string that contain name of that object
for example :
i know that object of from2 is "Frm_User" and string whith this code

string temp="Frm_User";

can i access the object of form 2 with temp?and change property and and field of that?

Re: can i dynamicly access object from name of object

Luc Pattyn24-Dec-09 0:48

Luc Pattyn

24-Dec-09 0:48

Have a look at Activator.CreateInstance().

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: can i dynamicly access object from name of object

softty24-Dec-09 0:22

softty

24-Dec-09 0:22

You can probably, expose AllowEdit through a public property and set it from your code

love2code

How to show all surfaces of a cube?

whiteclouds23-Dec-09 4:48

whiteclouds

23-Dec-09 4:48

Hi everyone!
I am a new one to DirectX. Now I want to draw a cube on Windows Mobile. The language I used is C#, and I want to use DirectX technology. I had already drawn every surface. These surfaces can be shown individual. But when I write these datas into a buffer altogether for showing all surfaces, only the first surface can be drawn. Other surface dispear. I don't know the reason. I hope someone could be kind to help me. Thx!

There is some white cloud floating on the blue sky. That's the landscape I like.

how to create 2 threads on on diferent procesors

Renven23-Dec-09 3:29

Renven

23-Dec-09 3:29

hi guys,
I need your help.
let's suppose I have Dual-Core CPU and I need know how to create two threads, each in different processor.
for example:
thread1 runs in 1core
thread2 runs in 2core

when implementing tread1.start(); thread2.start(); they both run some random function lake NumberTest();

Thanks in advance,
renven

Re: how to create 2 threads on on diferent procesors [modified]

#realJSOP23-Dec-09 4:31

#realJSOP

23-Dec-09 4:31

~~Thread.SetProcessorAffinity()[^]~~

It appears as if threading in .Net already distributes multiple threads across all available processors/cores, so you don't appear to have to worry about it.

modified on Wednesday, December 23, 2009 10:49 AM

Re: how to create 2 threads on on diferent procesors

Ghydo23-Dec-09 4:39

Ghydo

23-Dec-09 4:39

This is surely a better solution than mine! Smile | :)

Re: how to create 2 threads on on diferent procesors

#realJSOP23-Dec-09 4:39

#realJSOP

23-Dec-09 4:39

Then vote it a good answer. Smile | :)

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