Add string of arraylist in Linq

Question

I need to add arraylist of items in linq.Below is my sample code.

string[] _str = ("1.21,2.02,3.14,4.951,5.156").ToString().Split(',');
double Sum = 0.0;
for (int i = 0; i < _str.Length; i++)
{
  if (_str[i].ToString() != ",")
     Sum = Sum + Convert.ToDouble(_str[i]);
}

The above code i have done in for loop to get the sum of all items in the array list. I need to convert the same operation in linq.Please anyone help me solve this since i'm new to linq.

Thanks in advance.

Why do you need to do it in LINQ?

svick
– svick

2012-09-11 10:44:05 +00:00
Commented Sep 11, 2012 at 10:44 — svick
– svick, Commented Sep 11, 2012 at 10:44
The first line is so redundant.

Lews Therin
– Lews Therin

2012-09-11 10:44:07 +00:00
Commented Sep 11, 2012 at 10:44 — Lews Therin
– Lews Therin, Commented Sep 11, 2012 at 10:44

sloth · Accepted Answer · 2012-09-11 10:45:48Z

3

Use the Sum method:

string[] _str = "1.21,2.02,3.14,4.951,5.156".Split(',');
var result = _str.Sum(e => Double.Parse(e));

answered Sep 11, 2012 at 10:45

sloth

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2 Comments

Arun Over a year ago

Thanks for reply,if suppose a value that is coming from DB is like this 1.21,2.02,3.14,4.951,5.156, . Is there any code change will occur.

sloth Over a year ago

@Neon Sorry, I don't understand you.

Lews Therin · Accepted Answer · 2012-09-11 11:01:01Z

1

string[] _str =  {"1.21","2.02","3.14","4.951","5.156"};
double Sum = 0.0;
for (int i = 0; i < _str.Length; i++)
{
    double.TryParse(_str[i],out val)
}

But if you are doing this for sake of learning linq

string[] _str = {"1.21","2.02","3.14","4.951","5.156"};
_str.Sum(x => 
    {  
       double val ; 
       if(double.TryParse(x, out val)){
         return val;
       }
       return 0.0;
    });

If you are sure that the string will always contain valid numeric strings. Then you can just use double.Parse(x).

edited Sep 11, 2012 at 11:01

answered Sep 11, 2012 at 10:55

Lews Therin

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Comments

Yograj Gupta · Accepted Answer · 2012-09-11 10:46:27Z

0

You can try

string[] _str = "1.21,2.02,3.14,4.951,5.156".Split(',');
double Sum = _str.Sum(x=>Convert.ToDouble(x));

answered Sep 11, 2012 at 10:46

Yograj Gupta

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Comments

Numan · Accepted Answer · 2012-09-11 10:58:32Z

0

Try...

var _str = _str = ("1.21,2.02,3.14,4.951,5.156").ToString().Split(',');
var _sum = Array.ConvertAll<String, Double>(_str, Double.Parse).Sum();

Another one liner, with method chaining example...

var _sum = "1.21,2.02,3.14,4.951,5.156".Split(',').Sum(x => Double.Parse(x));

edited Sep 11, 2012 at 10:58

answered Sep 11, 2012 at 10:51

Numan

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