IsNumeric in C#. bool as '0'

Question

1.00/5 (1 vote)

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Hi,

C#

string tracking = "887532132156561";
int tck;
bool trackingCheck =  int.TryParse((tracking), out tck);

I want to check if tracking isNumaric or not and tracking here is string.

This code is working fine for me.

bool trackingCheck is returning me '0' False.

But, I feel it should be true '1'.

What am I missing here.

-Cyrus

Posted 2-Feb-16 7:42am

Cyrus_Vivek

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4 solutions

Solution 3

Do you want to just check that tracking is numeric value or do you need that tck integer (or long) as well?
In case you just want to check that the value is numeric then you can use the following:

C#

string tracking = "887532132156561";
bool trackingCheck = tracking.All(c => char.IsDigit(c));

Posted 2-Feb-16 8:53am

Mario Z

Comments

Sergey Alexandrovich Kryukov 2-Feb-16 15:25pm

My 5, but this is only acceptable if this is the goal of the check; but it won't allow parsing the number as int. Solutions 1 to 2 are correct.
And I added my 5 cents as Solution 4: no, int.Try parse doesn't return '0'; it's just the inquirer's fantasy. :-)
—SA

Cyrus_Vivek 9-Feb-16 9:27am

Mario,
I only wanted to check if tracking is a numeric value or not. I am not considered about tck. As my goal was only to check; it works perfect! Thanks!

Mario Z 9-Feb-16 9:46am

You're welcome.

Solution 4

In addition to Solutions 1 to 3: no, int.TryParse does not return 0, 1, '0' or '1'. It returns one of the object of bool type, true of false. The .NET Boolean type is abstracted from the numeric representation of the values, and this is a sane decision any reasonable designer of the language or platform should make.

—SA

Posted 2-Feb-16 9:22am

Sergey Alexandrovich Kryukov

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Kornfeld Eliyahu Peter · Accepted Answer · 2016-02-02T07:49:00

Solution 1

In C# int is a shorthand reference to Int32 - a 32 bit integer[^], which have the range of -2,147,483,648 to 2,147,483,647...Your value is way out of this...
Try using Int64 (long). It have much larger range...
If you need more and no negative values used you can try UInt64 (ulong) or for really large numbers (with negative values) Decimal (decimal)...

Posted 2-Feb-16 7:49am

Kornfeld Eliyahu Peter

Comments

ZurdoDev 2-Feb-16 13:53pm

+5

Kornfeld Eliyahu Peter 2-Feb-16 13:59pm

Thank you...

Cyrus_Vivek 2-Feb-16 14:15pm

+5 and Accepted. Thanks alot!
I just figured it out, and you got me over here before me! :)
-Cyrus

Sergey Alexandrovich Kryukov 2-Feb-16 15:23pm

My 5.
And I added my 5 cents as Solution 4: no, int.Try parse doesn't return '0'; it's just the inquirer's fantasy. :-)
—SA

PIEBALDconsult · Accepted Answer · 2016-02-02T07:50:00

Solution 2

You receive false because "887532132156561" exceeds the maximum value of int (2147483647); try going long which has a max value of 9,223,372,036,854,775,807.
https://msdn.microsoft.com/en-us/library/system.int32.maxvalue(v=vs.110).aspx

Posted 2-Feb-16 7:50am

PIEBALDconsult

Updated 2-Feb-16 7:52am

v3

Comments

ZurdoDev 2-Feb-16 13:53pm

+5

Cyrus_Vivek 2-Feb-16 14:16pm

+5Got it! Thank you!
-Cyrus

Sergey Alexandrovich Kryukov 2-Feb-16 15:23pm

My 5.
And I added my 5 cents as Solution 4: no, int.Try parse doesn't return '0'; it's just the inquirer's fantasy. :-)
—SA