How to count Distinct in List with return list with same value count in c#

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Hi,

For Example:

My Row data is

C#

string[] filePaths1 = { "7.1", "7.1", "7.2", "7.2", "7.3", "7.4" };

I need a linq query that will give me the list of list with the number of unique data.

For example:

7.1 => 2
7.2 => 2
7.3 => 1
7.4 => 1

Thanks,

Posted 7-Jan-15 22:31pm

Mayank Engineer

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3 solutions

Solution 2

Use a generic Dictionary<string, int>. Iterate over the original list, comparing every entry with the dictionary using the ContainsKey() method. Keys that don't exist yet, get a new entry in the dictionary with Add(whateverString, 1), existing keys just increase their value using YourDictionary[whateverString]++

Posted 7-Jan-15 22:41pm

lukeer

Solution 3

You could do like this:

C#

string[] filePaths1 = { "7.1", "7.1", "7.2", "7.2", "7.3", "7.4" };

List<string> distinctFilePaths = filePaths1.Distinct().ToList();

foreach(string filePath in distinctFilePaths)
{
    int count = filePaths1.Count(x => x == filePath);
}

Posted 7-Jan-15 22:49pm

TheRealSteveJudge

v2

Comments

TheRealSteveJudge 8-Jan-15 5:10am

@downvoter: What is wrong with this solution?

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Maciej Los · Accepted Answer · 2015-01-07T22:38:00

Solution 1

For example using Linq:

C#

string[] filePaths1 = { "7.1", "7.1", "7.2", "7.2", "7.3", "7.4" };

var qry = from s in filePaths1
		group s by s into grp
		select new{
			num = grp.Key,
			count = grp.Count()
		};
//then...
foreach(var o in qry)
{
    Console.WriteLine("{0} -> {1}", o.num, o.count);
}

Posted 7-Jan-15 22:38pm

Maciej Los

Updated 7-Jan-15 23:10pm

v2

Comments

Peter Leow 8-Jan-15 4:46am

5ed!

Maciej Los 8-Jan-15 4:46am

Thank you, Peter ;)

Mayank Engineer 8-Jan-15 4:53am

Thank you

Maciej Los 8-Jan-15 4:54am

You're very welcome ;)

Mayank Engineer 8-Jan-15 5:00am

How to access var qry count and it's key ?

Maciej Los 8-Jan-15 5:05am

foreach(var o in qry)
{
    Console.WriteLine("{0} -> {1}", o.num, o.count);
}

Oshtri Deka 8-Jan-15 5:08am

5.

Maciej Los 8-Jan-15 5:09am

Thank you ;)

TheRealSteveJudge 8-Jan-15 5:12am

100% LINQ. 5*

Maciej Los 8-Jan-15 5:24am

Thank you ;)

BillWoodruff 8-Jan-15 7:51am

+5

Maciej Los 8-Jan-15 8:22am

Thank you, Bill ;)