Checking String contains only number [duplicate]

Question

How to check the string is number or not. I am verifying mobile number codes in which it should have 10 digits and only in numerical format.

string str="9848768447"
if(str.Length==10 &&  Here I need condition to check string is number or not)
{
 //Code goes here
}

I am new to programming. please help me

Have a look here stackoverflow.com/questions/5026689

Kulasangar
– Kulasangar

2014-06-24 08:41:12 +00:00
Commented Jun 24, 2014 at 8:41 — Kulasangar
– Kulasangar, Commented Jun 24, 2014 at 8:41

Community · Accepted Answer · 2017-05-23 10:26:13Z

6

Use int.TryParse:

int i;
if(str.Length==10 && int.TryParse(str, out i))
{
     //Code goes here
}

Another way which has issues with unicode digits is using Char.IsDigit:

if(str.Length==10 && str.All(Char.IsDigit))
{

}

edited May 23, 2017 at 10:26

CommunityBot

11 silver badge

answered Jun 24, 2014 at 8:38

Tim Schmelter

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6 Comments

EaterOfCode Over a year ago

"which has issues with unicode digits" why even show it then D:

Nicolas Tyler Over a year ago

you could use regex as well Regex.IsMatch(input, @"^\d+$") or Regex.IsMatch(input, @"\d")

Elad Lachmi Over a year ago

Wouldn't a RegEx solution be more efficient?

Tim Schmelter Over a year ago

@EaterOfCode: because it can be useful, is efficient and the direct answer to OP's question. It is - by the way - similar to regex with the digit specifier but more efficient and readable.

EaterOfCode Over a year ago

@TimSchmelter not really, It's obvious (imo) that he is stating latin numbers and not arabic ones or other weird numeric characters. but hey whatever floats your boat, or integer from that perspective.

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