Convert a string which might be a number to an int

[Tony]

Hello!

It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...) static
methods works in exactly the same way.
Both can throw an exeption.

So is it any different at all between these two ?

string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();

try
{
int number1 = Convert.ToInt32 (input1);
int number2 = int32.Parse(inp ut2);
}
catch
{...}

//Tony

[Bob Powell [MVP]]

Re: Convert a string which might be a number to an int

Use TryParse

--
--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting

http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks

http://www.bobpowell.net/tipstricks.htm

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"Tony" <johansson.ande rsson@telia.com wrote in message
news:O7ZpWDS1IH A.3860@TK2MSFTN GP05.phx.gbl...

Hello!
>
It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...) static
methods works in exactly the same way.
Both can throw an exeption.
>
So is it any different at all between these two ?
>
string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();
>
try
{
int number1 = Convert.ToInt32 (input1);
int number2 = int32.Parse(inp ut2);
}
catch
{...}
>
//Tony
>
>

[=?ISO-8859-2?Q?Micha=B3_Piaskowski?=]

Re: Convert a string which might be a number to an int

one difference I know of is:

Convert.ToInt32 (null) // returns 0
Int32.Parse(nul l) // throws exceprion.

[Tony]

Re: Convert a string which might be a number to an int

Hello!

Yes TryParse seems to be better but just for curiosity does anyone have an
answer to my question.
//Tony


"Bob Powell [MVP]" <bob@spamkiller bobpowell.netsk rev i meddelandet
news:DFBED3B0-0F14-42F3-ABDF-EC53D8D6E8E5@mi crosoft.com...

Use TryParse
>
--
--
Bob Powell [MVP]
Visual C#, System.Drawing
>
Ramuseco Limited .NET consulting

http://www.ramuseco.com

>
Find great Windows Forms articles in Windows Forms Tips and Tricks

http://www.bobpowell.net/tipstricks.htm

>
Answer those GDI+ questions with the GDI+ FAQ

http://www.bobpowell.net/faqmain.htm

>
All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.
>
>
"Tony" <johansson.ande rsson@telia.com wrote in message
news:O7ZpWDS1IH A.3860@TK2MSFTN GP05.phx.gbl...

Hello!

It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...) static
methods works in exactly the same way.
Both can throw an exeption.

So is it any different at all between these two ?

string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();

try
{
int number1 = Convert.ToInt32 (input1);
int number2 = int32.Parse(inp ut2);
}
catch
{...}

//Tony

>

[Jon Skeet [C# MVP]]

Re: Convert a string which might be a number to an int

Tony <johansson.ande rsson@telia.com wrote:

It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...) static
methods works in exactly the same way.

Not quite. Convert.ToInt32 ((string)null) will return 0. int.Parse(null)
will throw an exception.

Both can throw an exeption.
>
So is it any different at all between these two ?
>
string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();
>
try
{
int number1 = Convert.ToInt32 (input1);
int number2 = int32.Parse(inp ut2);
}
catch
{...}

See above (beyond the fact that you mean int.Parse or Int32.Parse) -
but in this case the better solution would be to use int.TryParse.

--
Jon Skeet - <skeet@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon_skeet
C# in Depth: http://csharpindepth.com

[qglyirnyfgfo@mailinator.com]

Re: Convert a string which might be a number to an int

The internal implementation of Convert.ToInt32 () is shown below:

public static int ToInt32(string value)
{
if (value == null)
{
return 0;
}
return int.Parse(value , CultureInfo.Cur rentCulture);
}








On Jun 23, 6:11 am, "Tony" <johansson.ande rs...@telia.com wrote:

Hello!
>
It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...) static
methods works in exactly the same way.
Both can throw an exeption.
>
So is it any different at all between these two ?
>
string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();
>
try
{
    int number1 = Convert.ToInt32 (input1);
    int number2 = int32.Parse(inp ut2);}
>
catch
{...}
>
//Tony

[Bob Powell [MVP]]

Re: Convert a string which might be a number to an int

Ok, well, the difference is that one returns zero (ConvertTo) and the other
throws an exception.
The problem is that if you really want to know if the string was in the
correct format then you need to catch an exception which to be honest is a
bad technique. Exceptions should be, well, the exception, rather than the
rule.
ConvertTo returns zero in the case of an error which is bad because every
mathemetician will scream that zero is a real number and is valid on it's
own.

Therefore, for best practices, TryParse satisfies the criteria of decoding
the value as well as discovering whether the string was a perfectly valid
zero or just some gibberish.


--
--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting

http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks

http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ

http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.


"Tony" <johansson.ande rsson@telia.com wrote in message
news:%234MlkJS1 IHA.5728@TK2MSF TNGP06.phx.gbl. ..

Hello!
>
Yes TryParse seems to be better but just for curiosity does anyone have an
answer to my question.
//Tony
>
>
"Bob Powell [MVP]" <bob@spamkiller bobpowell.netsk rev i meddelandet
news:DFBED3B0-0F14-42F3-ABDF-EC53D8D6E8E5@mi crosoft.com...

>Use TryParse
>>
>--
>--
>Bob Powell [MVP]
>Visual C#, System.Drawing
>>
>Ramuseco Limited .NET consulting
>http://www.ramuseco.com
>>
>Find great Windows Forms articles in Windows Forms Tips and Tricks
>http://www.bobpowell.net/tipstricks.htm
>>
>Answer those GDI+ questions with the GDI+ FAQ
>http://www.bobpowell.net/faqmain.htm
>>
>All new articles provide code in C# and VB.NET.
>Subscribe to the RSS feeds provided and never miss a new article.
>>
>>
>"Tony" <johansson.ande rsson@telia.com wrote in message
>news:O7ZpWDS1I HA.3860@TK2MSFT NGP05.phx.gbl.. .

Hello!
>
It seems to me that both Int32.Parse(..) and Convert.ToInt32 (...)
static
methods works in exactly the same way.
Both can throw an exeption.
>
So is it any different at all between these two ?
>
string input1 = Console.ReadLin e();
string input2 = Console.ReadLin e();
>
try
{
int number1 = Convert.ToInt32 (input1);
int number2 = int32.Parse(inp ut2);
}
catch
{...}
>
//Tony
>
>

>>

>
>