Compare two column values and count of the matched and unmatched records

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1.00/5 (1 vote)

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I have table(Records) like an

Id  Data1 Data2
1     A     B
2     C     C
3     D     D
4     B     A
5     C     D
6     A     A
7     D     D

I need the Count of matched rows like (matched = 4 & unmatched = 3) using Entity Framework

and i have done the code like below. and i got what i expected result and i need to avoid the performance as well code reducing.

C#

int correctAnswersCount = 0;
int incorrectAnswersCount = 0;
int totalUnAttemptsCount = 0;
string[] aa = (from a in db.ALBulkTestResults where a.CandidateID == candidateId select a.Answer).ToArray();
string[] bb = (from a in db.ALBulkTestResults where a.CandidateID == candidateId select a.CandidateAns).ToArray();

for (int i=0; i<aa.Length; i++ )
{
    string comp1 = aa[i];
    string comp2 = bb[i];
    if(comp1 == comp2)
    {
        ViewData["correctAnswersCount"] = correctAnswersCount++;
    }
    else
    {
        if (comp2 == "N")
        {
            ViewData["totalUnAttemptsCount"] = totalUnAttemptsCount++;
        }
        else
        {
            ViewData["incorrectAnswersCount"] = incorrectAnswersCount++;
        }
    }
}

Posted 30-Nov-15 6:32am

jagan12013

Updated 30-Nov-15 13:41pm

CHill60

v3

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Patrice T 30-Nov-15 15:06pm

Homework ?

2 solutions

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Snesh Prajapati · Answer 1 · 2015-11-30T22:41:00

Yes, you can achieve the same by writing very simple LINQ query.
Code sample is given below:

   namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Customer cust = new Customer();

            List<Customer> custList = cust.GetCustomerData();
            int matchedCount = custList.Where(p => p.Data1 == p.Data2).Count();
            int unmatchedCount = custList.Where(p => p.Data1 != p.Data2).Count();
        }
    }

    public class Customer
    {
        public int Id { get; set; }
        public string Data1 { get; set; }
        public string Data2 { get; set; }

        public List<Customer> GetCustomerData()
        {
            return new List<Customer> {
                 new Customer () {  Id = 1, Data1 = "A",Data2 = "B"},
                 new Customer () {  Id = 2, Data1 = "C",Data2 = "C"},
                 new Customer () {  Id = 3, Data1 = "D",Data2 = "D"},
                 new Customer () {  Id = 1, Data1 = "B",Data2 = "A"},
                 new Customer () {  Id = 1, Data1 = "C",Data2 = "D"},
                 new Customer () {  Id = 1, Data1 = "A",Data2 = "A"},
                 new Customer () {  Id = 1, Data1 = "A",Data2 = "B"},
                 new Customer () {  Id = 1, Data1 = "D",Data2 = "D"} 
            };
        }
    }
}

Matt T Heffron · Answer 2 · 2015-12-01T07:37:00

You are doing a lot of extra work.
The main thing is to reduce to a single pass through the data.
Also, don't update ViewData until the end of the analysis.

C#

int correctAnswersCount = 0;
int incorrectAnswersCount = 0;
int totalUnAttemptsCount = 0;
const string NoAttempt = "N"; 
foreach (var a in db.ALBulkTestResults) 
{
    string candidateAnswer = a.CandidateAns;
    if (candidateAnswer == a.Answer)
    {
        ++correctAnswersCount;
    }
    else if (candidateAnswer == NoAttempt)
    {
        ++totalUnAttemptsCount;
    }
    else
    {
        ++incorrectAnswersCount;
    }
}
ViewData["correctAnswersCount"] = correctAnswersCount;
ViewData["totalUnAttemptsCount"] = totalUnAttemptsCount;
ViewData["incorrectAnswersCount"] = incorrectAnswersCount;

Compare two column values and count of the matched and unmatched records

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