Ignoring first item of string Array

Question

How to ignore the first item of string[] in case of if (item=="") my code like

string[] temp3 = clearstring.Split(new string[]{@",","\r\n","\n","]", "\"", "}"}, StringSplitOptions.None);
temp.Close();

StreamWriter sW = new StreamWriter(Npath);

foreach (string item in temp3)
{
    if (item == "")
    {
    }

Any instance of the array where the string is empty or just if the first isntance of the array is empty? — asawyer
– asawyer, Commented Mar 28, 2013 at 11:58
Is it OK to ignore all empty strings? If yes, you could just use StringSplitOptions.RemoveEmptyEntries. — sloth
– sloth, Commented Mar 28, 2013 at 12:02

Rob · Accepted Answer · 2013-06-07 19:49:47Z

3

Use the StringSplitOptions.RemoveEmptyEntries

string[] temp3 = clearstring.Split(new string[]{@",","\r\n","\n","]", "\"", "}"}, StringSplitOptions.RemoveEmptyEntries);

Edit: Option for only ingoring first empty string:

for(int i=0; i<temp3.Length; i++)
{
    string item = temp3[i];
    if(i==0 && item == string.Empty)
       continue;

    //do work
}

edited Jun 7, 2013 at 19:49

user751651

answered Mar 28, 2013 at 12:02

Rob

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1 Comment

sloth Over a year ago

This is only correct the OP wants to ignore all empty strings.

score 1 · Accepted Answer · 2013-03-28 12:06:47Z

1

You should use the continue keyword.

That being said, you probably should use String.IsNullOrEmpty method instead of checking "" yourself.

if (String.IsNullOrEmpty(item))
{
   continue;
}

edited Mar 28, 2013 at 12:06

answered Mar 28, 2013 at 11:58

user195488

8 Comments

Matthew Watson Over a year ago

Since the string cannot be null, the best check is if (item.Length == 0) although arguably if (item == "") is the most readable. String.IsNullOrEmpty() is usually the most correct of course (but sadly horrible to read).

user195488 Over a year ago

@MatthewWatson: Can it still be empty? If so, IsNullOrEmpty seems pretty idiomatic.

user195488 Over a year ago

@MatthewWatson: It's not horrible to read, it's idiomatic. stackoverflow.com/a/84270/195488

Matthew Watson Over a year ago

@0A0D: Yes, String.IsNullOrEmpty(str) is the usual way people do it. I just don't happen to find it particularly readable. :) But playing around with extension methods to make it read like item.IsEmpty() is generally too much hassle. Anyway, all I'm saying is that in the case that you know a string not to be null, if (item.Length == 0) expresses the fact that item cannot be null.

user195488 Over a year ago

@MatthewWatson: I would politely disagree. It is very clear to the reader what you are doing and much easier to read when doing a code review or for maintainability.

|

Natrium · Accepted Answer · 2013-03-28 12:10:22Z

0

string[] temp3 = clearstring.Split(new string[]{@",","\r\n","\n","]", "\"", "}"}, StringSplitOptions.None);
temp.Close();

StreamWriter sW = new StreamWriter(Npath);

int i = 0;
foreach (string item in temp3)
{
    if (item == string.empty && i == 0)
    {
        continue;
    }
    // do your stuff here
    i++;
}

answered Mar 28, 2013 at 12:10

Natrium

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Comments

scartag · Accepted Answer · 2013-03-28 12:11:58Z

0

see below. You can use the continue keyword.

for (int i=0; i < temp3.Length; i++)
    {
                        if (i == 0 && item3[i] == "")
                        {
                           continue;
                        }
   }

edited Mar 28, 2013 at 12:11

answered Mar 28, 2013 at 11:58

scartag

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2 Comments

Natrium Over a year ago

you're not ignoring the first item if it is empty, but all empty items

scartag Over a year ago

@Natrium Didn't really read the question well .. updated my answer though. :)

Matthew Watson · Accepted Answer · 2013-03-28 12:46:00Z

Just for completeness, here's several Linq answers:

var stringsOmittingFirstIfEmpty = temp3.Skip(temp3[0] == "" ? 1 : 0);

var stringsOmittingFirstIfEmpty = temp3.Skip(string.IsNullOrEmpty(temp3[0]) ? 1 : 0);

var stringsOmittingFirstIfEmpty = temp3.Skip(1-Math.Sign(temp3[0].Length)); // Yuck! :)

I don't think I'd actually use any of these (especially the last, which is really a joke).

I'd probably go for:

bool isFirst = true;

foreach (var item in temp3)
{
    if (!isFirst || !string.IsNullOrEmpty(item))
    {
        // Process item.
    }

    isFirst = false;
}

Or

bool isFirst = true;

foreach (var item in temp3)
{
    if (!isFirst || item != "")
    {
        // Process item.
    }

    isFirst = false;
}

Or even

bool passedFirst = false;

foreach (var item in temp3)
{
    Contract.Assume(item != null);

    if (passedFirst || item != "")
    {
        // Process item.
    }

    passedFirst = true;
}

Menelaos Vergis · Accepted Answer · 2013-03-28 13:17:49Z

0

You mentioned that you need to skip first and last if it's empty

string[] temp3 = clearstring.Split(new string[]{@",","\r\n","\n","]", "\"", "}"}, StringSplitOptions.None);
temp.Close();

StreamWriter sW = new StreamWriter(Npath);

for (int i=0; i< temp3.Length; i++)
{
    if ((i == 0 || i == temp3.Length-1) && string.IsNullOrEmpty(temp3[i]))
       continue;
    //do your stuff here
}

edited Mar 28, 2013 at 13:17

answered Mar 28, 2013 at 12:10

Menelaos Vergis

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1 Comment

Menelaos Vergis Over a year ago

@Grant-Thomas post: ok i wanna the idea because actually i wanna to ignore the first and last item if equal "" – MohamedSayed

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