Again Problem with c# !

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Hi friends, After I sort all the data from a file, I have this kind of sort :
e.x

Cristiano Ronaldo
Cristiano Ronaldo
Cristiano Ronaldo
Van Persi
Karim Benzema
Lionel Messi
Lionel Messi
...
...

Now I need the code that this sort make like that :

Cristiano Ronaldo [3]
Van Persi [1]
Karim Benzema [1]
Lione Messi [2]

So, how many time is repeat the same name and surnme to tell in brackets []...

Posted 15-Apr-12 4:03am

h7h7h7

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VJ Reddy 15-Apr-12 12:56pm

Please see solution 3. It may be helpful to you.

4 solutions

Solution 1

Create some sort of List(T)[^], or other generic type and count the occurrences of each name before printing.

Posted 15-Apr-12 4:16am

Richard MacCutchan

Comments

h7h7h7 15-Apr-12 10:27am

Richard, I am not so good in c#, I need a code in windows form...
So based in the case above can write a simple code here about that problem !

[no name] 15-Apr-12 10:34am

What exactly have you tried?

h7h7h7 15-Apr-12 10:52am

I can get a data from a file, those data I put in list box and the result is ex:
AAA
AAA
AAA
BBB
CCC
CCC
and now I want to count them and put to another textbox or listbox like that:
AAA [3] .... "is repeat three times"
BBB [1] ... "is repeat one time "
CCC [2] ... "is repat two time"
CCC [1]

[no name] 15-Apr-12 10:56am

So, in other words, you have not actually tried to do anything except try and get someone else to write code for you. Writing code for you is not going to teach me anything and you sure won't learn anything.

h7h7h7 15-Apr-12 11:02am

I know it Wes Aday you are right, But I am in that situation that I need to do it quickly...when I have more time, I will try everything to do alone without others help. THnx

Richard MacCutchan 15-Apr-12 10:37am

Well you just need to check if a name exists in your list, if it does not then add it and set its counter to 1, if it already exists add 1 to its counter. If you do not know how to use a list, go and read the documentation; this is a good learning exercise for you.

Richard MacCutchan 15-Apr-12 10:39am

I also noticed in your original question that someone showed you how to do this with an array, so it should be a simple matter for you to count the number of entries for each name once you have them sorted.

h7h7h7 15-Apr-12 10:49am

Ok let me explain again you ( I will try it now, what u say )....I have a text file, I call it and all data are in a list box. So from this listbox know I need to count the number of entries, but I didn't need to add new name. All the problem is that I can't do that code from "Console Apliction" to "windows form"... If you can help me in this part ?? ( I am really not so good in c#, but I have to do that )...thnx

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Shahin Khorshidnia · Accepted Answer · 2012-04-15T04:55:00

Hello

For example you have a DataSet of names. Let's suppose it's a List (Simple):

C#

List<string> nameList = new List<string>();
nameList.Add("Cristiano Ronaldo");
nameList.Add("Cristiano Ronaldo");
nameList.Add("Cristiano Ronaldo");
nameList.Add("Van Persi");
nameList.Add("Karim Benzema");
nameList.Add("Lione Messi");
nameList.Add("Lione Messi");
nameList.Add("Ali Karimi");
nameList.Add("Ali Karimi");
nameList.Add("Ali Karimi");
nameList = nameList.OrderBy(n => n).ToList();

So:

C#

Dictionary<string,> nameDictionary = new Dictionary<string,>();

foreach (string s in nameList)
{
    if (nameDictionary.Keys.Contains(s))
    {
        nameDictionary[s]++;
        continue;
    }
    nameDictionary.Add(s, 1);
}

MyListBox.DataSource = new BindingSource(nameDictionary, null);

And In the Consructor of Form (For example MyForm(){...}):

C#

MyListBox.Format += new ListControlConvertEventHandler((object sender, ListControlConvertEventArgs e) =>
{
    KeyValuePair<string, int> item = (KeyValuePair<string, int>)e.ListItem;
    e.Value = string.Format("{0} [{1}]", item.Key, item.Value);
});

VJ Reddy · Accepted Answer · 2012-04-15T06:54:00

Solution 3

The following code can be used to make distinct list of names along with number of occurances in the initial list.

C#

void Main()
{
    Form form1 = new Form();
    ListBox listBox1 = new ListBox();
    form1.Controls.Add(listBox1);

    List<string> names = new List<string>(){
        "Cristiano Ronaldo",  "Lione Messi",
        "Van Persi", "Karim Benzema", "Lione Messi",
        "Cristiano Ronaldo", "Cristiano Ronaldo"};
    //Make a list of sorted Distinct Names
    var distinctNames = names.Distinct().OrderBy (n => n);
    //Make list of distinctNames with count
    List<string> distinctNamesWithCount = (from name in distinctNames
        select string.Format("{0} [{1}]",name,names.Count (n => n==name ))).ToList();
    listBox1.DataSource=distinctNamesWithCount;
    form1.ShowDialog();
}
//distinctNamesWithCount contents will be

//Cristiano Ronaldo [3]
//Karim Benzema [1]
//Lione Messi [2]
//Van Persi [1]

The above code can be tested quickly using LINQPad which can be downloaded from here http://www.linqpad.net/[^]

Posted 15-Apr-12 6:54am

VJ Reddy

Updated 15-Apr-12 7:48am

v2

Comments

Shahin Khorshidnia 15-Apr-12 13:48pm

Good solution.
Better than mine

VJ Reddy 15-Apr-12 13:49pm

Thank you, Shahin.

h7h7h7 15-Apr-12 17:25pm

I can't believe, I think I have the right code but I cant implement it.
VJ Reddy I didn't need to add items in list, I already have them in a list, I just need to count those items and then to another list to put them...
So I think I don't need this code:
List<string> names = new List<string>(){
"Cristiano Ronaldo", "Lione Messi",
"Van Persi", "Karim Benzema", "Lione Messi",
"Cristiano Ronaldo", "Cristiano Ronaldo"};

But in this part how cant I take the iteme that are already in listbox...
Sory I ask a lot..

h7h7h7 15-Apr-12 17:29pm

I can't believe, I think I have the right code but I cant implement it.
VJ Reddy I didn't need to add items in list, I already have them in a list, I just need to count those items and then to another list to put them...
So I think I don't need this code:
List<string> names = new List<string>(){
"Cristiano Ronaldo", "Lione Messi",
"Van Persi", "Karim Benzema", "Lione Messi",
"Cristiano Ronaldo", "Cristiano Ronaldo"};

But in this part how cant read items in a listbox that are already and then to
Sory I ask a lot.... have the result e.x
//Cristiano Ronaldo [3]
//Karim Benzema [1]
//Lione Messi [2]
//Van Persi [1]

VJ Reddy 15-Apr-12 20:15pm

If you already have list of names, then use that list instead of List names = ...
If the names are there in a list box then
var names = listBoxNames.Items;
Once, you obtain the names list, then the rest of code will remain as it is.
In case of any problem, please post your code where names are there.

Mohammad A Rahman 15-Apr-12 23:06pm

Good Solution :)

VJ Reddy 15-Apr-12 23:24pm

Thank you, Rahman.

Mohammad A Rahman · Accepted Answer · 2012-04-15T17:08:00

Solution 3 is good :)

You might try this one as well,

C#

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

namespace Chapter_5
{
    class Program
    {
        static void Main(string[] args)
        {

            List<string> names = new List<string>()
            {
                "Cristiano Ronaldo",  "Lione Messi",
                "Van Persi", "Karim Benzema", "Lione Messi",
                "Cristiano Ronaldo", "Cristiano Ronaldo",
            };
            names.GroupBy(name => name).Select(group => string.Format("{0} [{1}]", group.Key, group.Count()))
                .ToList().ForEach(item => Console.WriteLine(item));
        }
    }
}</string></string>

Hope it helps :)

Again Problem with c# !

4 solutions

Solution 2

Solution 3

Solution 4

Solution 1

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