string array concat with it's old value in c#

Question

1.00/5 (1 vote)

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i have array like

C#

string[] Phone = new string[25];

and i add data in phone array like this way

C#

Phone[0]="5465464";
Phone[1]="5465464";
Phone[2]="5465464";
Phone[3]="5465464";
Phone[4]="5465464";
Phone[5]="5465464";

now want to append 67895678 in Phone[0]="5465464";
so i want

phone[0]="5465464 | 67895678";

for that what should i do ?

Posted 18-Jun-13 1:34am

Archit Patel

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Comments

Shahin Khorshidnia 18-Jun-13 7:38am

Phone[0] = string.Format("{0}|{1}", Phone[0], "67895678");

[no name] 18-Jun-13 7:56am

Shahin Khorshidnia thank you it's also work.

Shahin Khorshidnia 18-Jun-13 8:05am

Youre welcome

3 solutions

Solution 2

Even though you can append strings, this is not recommended if you need to do it repetitively, as such operation will have poor performance. The strings are immutable. When you append strings, a brand-new instance is always created. Do I even need to explain the implication of this on performance?

So, if you have several concatenation of small fixed number of strings, use string.Format. If you scheme of composing a string is more complex, such with loops or other constructs (ifs, and so on), use the mutable type System.Text.StringBuilder:
http://msdn.microsoft.com/en-us/library/system.text.stringbuilder.aspx[^].

—SA

Posted 18-Jun-13 2:31am

Sergey Alexandrovich Kryukov

Solution 3

C#

using System;
public class BaseClass
{
static void Main()
{
string[] Phone = new string[5];
Phone[0]="5465464";
Phone[1]="5465464";
Phone[2]="5465464";
Phone[3]="5465464";
Phone[4]="5465464";
foreach(string p in Phone)
{
    Console.WriteLine("Phone{}"+p);

}
string a=Phone[0]+"67895678";
Console.WriteLine(a);

}

}

Posted 18-Jun-13 18:57pm

gagandeep.pratihar

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Stephen Hewison · Accepted Answer · 2013-06-18T01:36:00

Solution 1

Nice an easy. The += operator will allow you to append a value to a string or apply an addition to a number value.

C#

Phone[0] += "|67895678"

This is effectively the same as writing

C#

Phone[0] = Phone[0] + "|67895678"

Posted 18-Jun-13 1:36am

Stephen Hewison

Updated 18-Jun-13 1:37am

v2

Comments

Rockstar_ 18-Jun-13 7:40am

My 5!

Shahin Khorshidnia 18-Jun-13 7:43am

var newNumber = "67895678";

newNumber=string.IsNullOrEmpty(Phone[0])?newNumber:"|"+newNumber;
Phone[0]=newNumber;

[no name] 18-Jun-13 7:56am

also my +5