Join unique strings from an array of objects

Question

I have an array of objects containing strings.

var values = new object[5];
values[0] = "PIZZA HUT";
values[1] = "ISLAMABAD";
values[2] = "ISLAMABAD";
values[3] = "PAKISTAN";
values[4] = "PAKISTAN";

I want to get a string of unique elements from the array, joined with , also need to check if string isNullOrWhiteSpace;

PIZZA HUT, ISLAMABAD, PAKISTAN.

Currently I am doing the following. But you can see that it required to much checks in the if statement. I was wondering if there is a better way using LINQ

string featureName = values[0] as string;
string adminboundry4 = values[1] as string;
string adminboundry3 = values[2] as string;
string adminboundry2 = values[3] as string;
string adminboundry1 = values[4] as string;


if (!string.IsNullOrWhiteSpace(adminboundry4) 
   && adminboundry4 != adminboundry1 
   && adminboundry4 != adminboundry2 
   && adminboundry4 != adminboundry3) //want to get rid of these checks
                featureName += "," + adminboundry4;

if (!string.IsNullOrWhiteSpace(adminboundry3)) //Not checking for duplicate here just for this question
                featureName += "," + adminboundry3;

if (!string.IsNullOrWhiteSpace(adminboundry2)) //Not checking for duplicate here just for this question
                featureName += "," + adminboundry2;

if (!string.IsNullOrWhiteSpace(adminboundry1)) //Not checking for duplicate here just for this question
                featureName += "," + adminboundry1;

featureName contains PIZZA HUT, ISLAMABAD, PAKISTAN, PAKISTAN

thats what i want to minimize

Bilal Hashmi
– Bilal Hashmi

2012-08-31 11:55:06 +00:00
Commented Aug 31, 2012 at 11:55 — Bilal Hashmi
– Bilal Hashmi, Commented Aug 31, 2012 at 11:55

Ehsan Sajjad · Accepted Answer · 2015-01-19 16:22:37Z

16

You can use string.Join() method and get array distinct string elements from your object array.

try this:

var Result = string.Join(",", values.Cast<string>()
                                 .Where(c => !string.IsNullOrWhiteSpace(c))
                                 .Distinct());

edited Jan 19, 2015 at 16:22

Ehsan Sajjad

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answered Aug 31, 2012 at 11:48

Habib

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2 Comments

Bilal Hashmi Over a year ago

That is what I was looking for, let me try

Laoujin Over a year ago

+1 The only answer (so far) that included the IsNullOrWhiteSpace check.

Martin Liversage · Accepted Answer · 2012-08-31 11:54:40Z

5

Yes, you can use LINQ:

var featureName = String.Join(
  ",",
  values
    .Cast<String>()
    .Where(s => !String.IsNullOrWhiteSpace(s))
    .Distinct()
);

edited Aug 31, 2012 at 11:54

answered Aug 31, 2012 at 11:48

Martin Liversage

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1 Comment

Bilal Hashmi Over a year ago

I also need to check for white space or null string

J0HN · Accepted Answer · 2012-08-31 11:48:30Z

0

String.Join(",",values.ToList().Distinct(str=>str))

answered Aug 31, 2012 at 11:48

J0HN

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1 Comment

Bilal Hashmi Over a year ago

I also need to check for white space or null string

Parv Sharma · Accepted Answer · 2012-08-31 11:50:55Z

0

String.Join(",", values.Distinct().Where(s=>!s.ISNullOrWhiteSpace()))

answered Aug 31, 2012 at 11:50

Parv Sharma

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