get count of identical values in column of data gridview in windows c#

Question

4.00/5 (1 vote)

See more:

I have a datagridview which contains a column containing some identical values as shown below column A contains identical values. i want to get the count of identical values in it.

For ex:-
A B
ppp abc
abc hij
ppp def
I have tried this but not working.

C#

arrListIDs = new System.Collections.ArrayList();
           for (int k = 0; k < GrdItDetail.Rows.Count; k++)
           {
               string stritemcode = GrdItDetail.Rows[k].Cells["ItemCode"].Value.ToString();
               if (!arrListIDs.Contains(stritemcode))
               {
                   arrListIDs.Add(stritemcode);
                   //do ur code
               }
               else
               {
                   if (arrListIDs[0].ToString() == stritemcode)
                       arrListIDs.Add(stritemcode);
               }
           }

Any ideas .Any suggestions.
Please Helpme.
Thanks in advance.

Posted 1-Feb-16 2:22am

PWAVEL

Add a Solution

Comments

BillWoodruff 1-Feb-16 8:58am

Do you need to deal with the case where there is more than one "set" of duplicate values ? If you have this for the column:

abc
def
abc
abc
def

Do you need a result which tells you there are two groups of duplicate values, or, do you need a result that tells you there are a total of six items that are duplicates ?

1 solution

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)

BillWoodruff · Answer 1 · 2016-02-01T05:03:00

When you learn how to use Linq, this kind of task becomes very easy, but, let's see how you can do it using a Dictionary:

C#

public Dictionary<string,> StrToNDuplicates = new Dictionary<string,>();

public void GetColumnDuplicates(string colName)
{
    StrToNDuplicates.Clear();

    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        string val = row.Cells[colName].Value.ToString();

        if (! StrToNDuplicates.ContainsKey(val))
        {
           StrToNDuplicates.Add(val,0);
        }

        StrToNDuplicates[val]++;
    }
}

// for testing:
private void printDict()
{
    foreach (var kvp in StrToNDuplicates)
    {
        Console.WriteLine("Value: {0} NDuplicates: {1}", kvp.Key, kvp.Value);
    }
}

This iterates over the rows, getting the value of the cell at the named column within each row. Then, if the Dictionary doesn't already have a 'Key with the current value, a 'Key is created, its Value initialized to #0.

Each value causes an increment of the count field of the Dictionary. So, when you return from calling this function, the 'StrToNDuplicates Dictionary will contain one entry ('Key) for each distinct value, and a corresponding 'Value which is the number of duplicates of that distinct string value.