check the string having full number or the combinbation of number and string

Question

I want to check whether a string is only numeric, or is alphanumeric.

For example :

string test = "2323212343243423333";
string test1 = "34323df23233232323e";

I want to check test having number only or not. If the whole string having number means it returns true. Otherwise it returns false.

How can i do this?

Have a look at this: http://stackoverflow.com/questions/273141/regex-for-numbers-only — Greg Smith, Apr 11 '13 at 07:56
Have you googled **`check whether a string is only numeric`**? — I4V, Apr 11 '13 at 07:59

score 3 · Answer 1 · answered Apr 11 '13 at 07:57

3

bool allDigits = text.All(c => char.IsDigit(c));

Or

bool allDigits = text.All(char.IsDigit);

Unless by "numeric" you include hex numbers? My answer only works for strings that contain only digits, of course.

answered Apr 11 '13 at 07:57

Matthew Watson

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score 0 · Accepted Answer · answered Apr 11 '13 at 08:02

0

if the string length is not too long, you may try int.TryParse(string here) or you may write the function yourself by checking every character in the string like

if(MyString[i]-'0'<= 9 && MyString[i]-'0'>= 0)
//then it's a digit, and check other characters this way

answered Apr 11 '13 at 08:02

Mokhtar Ashour

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The example the OP gives is definitely too long for int.TryParse() – Matthew Watson Apr 11 '13 at 08:03
yeah, I've made it clear I guess :) – Mokhtar Ashour Apr 11 '13 at 08:04

check the string having full number or the combinbation of number and string

2 Answers2