Compare duplicated string

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How do i produce the following table below in csv format without duplicated string for student's name. I did try hashset class but that didn't work for me.

student's Name Grade Subject

A passed math
passed science
failed art

B passed math
passed science
failed art

A passed math
passed science
failed art

Posted 9-Sep-13 12:22pm

Philip Tia

Updated 9-Sep-13 12:23pm

v2

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Sergey Alexandrovich Kryukov 9-Sep-13 19:25pm

Your "that did not work for me" is not informative at all. Please see my answer. If this is not your concern, ask your follow-up questions.
—SA

2 solutions

Solution 2

In your requirement, you have a student who have a pass/fail status in several subjects.
So create a Dictionary< [string student], [Dictionary< [string subject], [string status]> ] >

Then you can iterate over main dictionary, print out the student name, and then iterate over inner dictionary and iterate over the subject/status combination.

The Dictionary will override existing values when u insert a duplicate, so be aware of spelling mistakes

Note that the above code is not actual code, just an illustration of design and which field go in where...

Posted 9-Sep-13 19:26pm

Nitin Singh India

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-09-09T13:24:00

Solution 1

Good idea. Use HashSet, but the way it would help you. This class does not allow duplicates. What's the problem? Do you want to preserve order? If this is the problem, use both list, to keep order, and HashSet, to keep uniqueness. Got the idea? This is a really simple thing.

—SA

Posted 9-Sep-13 13:24pm

Sergey Alexandrovich Kryukov

Updated 9-Sep-13 14:08pm

v2

Comments

Philip Tia 9-Sep-13 20:03pm

What i am doing it right now is, which resulting in

student's Name Grade Subject

A passed math
passed science
failed art

B passed math
passed science
failed art

passed math /*student name 'A' is missing*/
passed science
failed art

public static HashSet<string> compareString = new HashSet<string>();

string[] student_name= {'A','B','A'};

if (compareString.Contains(student_name))
{
student_name= "";
}

compareString.Add(student_name);

Sergey Alexandrovich Kryukov 9-Sep-13 20:07pm

You don't need all that. Look:
if (!myHash.Contains(line)) {
myHash.Add(line);
myList.Add(line);
}
—SA

Joezer BH 10-Sep-13 3:29am

5ed!

Sergey Alexandrovich Kryukov 10-Sep-13 10:39am

Thank you.
—SA