Re: Convert string to int - C# Discussion Boards

30-Jul-07 18:59

hi there,
i m trying to convert textbox.text to int but it always giving error while runtime
"Input string was not in a correct format."

textbox.text = "00.0000"
nums =Convert.ToInt32(textbox.text);

i also try

nums =int.textbox.text);</

it give error same above

nums =(int)textbox.text;</

it gives error
Cannot convert type 'string' to 'int'

someone know anyother way???;)

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Green Fuze30-Jul-07 19:03

Green Fuze

30-Jul-07 19:03

try:

int nums = int.Parse(this.textbox.Text);

Martin#30-Jul-07 19:57

Martin#

30-Jul-07 19:57

This will also throw an exception!

All the best,

Martin

Xmen Real 30-Jul-07 20:09

30-Jul-07 20:09

i just want to remove the decimals thats why i m trying to convert it in int as int dont have decimals
i can remove decimals with other methods too but conversion is the best way i thought

Green Fuze wrote:
try:

int nums = int.Parse(this.textbox.Text);

same error

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Christian Graus30-Jul-07 20:19

Christian Graus

30-Jul-07 20:19

What you want requires two steps. First, use double.TryParse ( or you will get an error ). Then, use Math.Floor, or Math.Ceiling, if you want to force rounding. Either way, case the double you end up with to an int.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Martin#30-Jul-07 19:56

Martin#

30-Jul-07 19:56

Hello,

As your string represents a double value, you will get a system format exception.
This would work:

string text = "0";
int inums =Convert.ToInt32(text);

text = "00.0000";
double dnums =Convert.ToDouble(text);

But I recommend to use the TryParse methods.
They will not throw an exception.

double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    //converion is ok
}
else
{
    //conversion is not ok
}

All the best,

Martin

Xmen Real 30-Jul-07 20:10

30-Jul-07 20:10

thanks but i dont want decimals remain

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Martin#30-Jul-07 20:19

Martin#

30-Jul-07 20:19

This will round it mathematical, but you also can use the Math functions or just modify the string.

string text = "1,5345";
double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    int inums = Convert.ToInt32(d);
}

All the best,

Martin

Xmen Real 31-Jul-07 19:06

31-Jul-07 19:06

ok i will

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Rhys Gravell30-Jul-07 21:03

Rhys Gravell

30-Jul-07 21:03

Data Entry Validation.

If decimals are illegal values prevent or validate their entry, don't leave your users guessing what the expected entry is.

Rhys

"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it"

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance."
Terry Pratchett

Peter Vertes1-Oct-07 10:29

Peter Vertes

1-Oct-07 10:29

First off you are trying to convert a Double to an Int with is not exactly what you are looking to do. Read this article; this will shed some light on the subject for you:

http://iheartdotnet.blogspot.com/2007/09/cast-vs-doubleparse-vs-converttodouble.html[^]

Xmen Real 1-Oct-07 16:36

intenal and internal protected

1-Oct-07 16:36

thanks but i think you replied it after 1 month xD

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DNS request: NAPTR

Spam Skiller30-Jul-07 18:51

Spam Skiller

30-Jul-07 18:51

Hi!
I've one question:
I want to send a request to DNS server with type NAPTR. But I don't know how. Help me, plz!!!

Sonia Gupta30-Jul-07 18:46

Sonia Gupta

30-Jul-07 18:46

Please explain me the use of keyword internal protected and internal with an example ??
what is the difference between internal protected and internal ??
Can construstor be declared internal protected/internal ?? why or why not???

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Christian Graus30-Jul-07 18:58

Christian Graus

30-Jul-07 18:58

google broken ?

internal means visible only within the current assembly. protected internal presumably means visible only to derived classes within the current assembly.

Yes, you can make a constructor whatever you like. If it's protected, obviously only derived classes can be created, unless a factory method is provided.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Sonia Gupta30-Jul-07 19:03

Sonia Gupta

30-Jul-07 19:03

Sir actually , google too provides this much information.as far as any example is concerned that , upto this limit i can use the internal member vaiables, and till this limit , i can make use of internal protected.
I mean if u provide any small example , any example.Please

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Christian Graus30-Jul-07 19:21

Christian Graus

30-Jul-07 19:21

Is what you mean to ask, why would you use these things ?

Internal is useful for things you want to hide, but which should be visible within a module. For example, if you have a seperate data layer class that you want to be visible only to the entity classes within your module. internal protected allows you to create a base class which is derived from within your module, but which clients of your module are unable to extend.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Vikram A Punathambekar30-Jul-07 22:17

Vikram A Punathambekar

30-Jul-07 22:17

Christian Graus wrote:
protected internal presumably means visible only to derived classes within the current assembly.

I knew I wasn't the only one. D'Oh! | :doh:

protected internal means it's visible everywhere within the same assembly *and* to all subclasses.

Cheers,
Vıkram.

After all is said and done, much is said and little is done.

pavanteja30-Jul-07 23:31

pavanteja

30-Jul-07 23:31

'internal' means any class in the same assembly can access it.
'protected' means any class that any inheriting class can access it.
'internal protected' (or 'protected internal' ) means that any class in the same assembly AND any inheriting class can access it.

example for internal : If application contains 2 files

Assembly1.cs, Assembly2.cs

If the first file contains a class (base class) (i.e. in assembly1)

The second file is in assembly2…. If u want to access the base class of assembly1 in assembly2 then u can’t access it…this is the concept of Internal…

In .Net 2.0 you can have 'friend' assemblies. If you make an assembly a 'friend' of another then it will have access to anything marked internal as if it was in the same assembly

pavan...

Sonia Gupta30-Jul-07 23:36

Sonia Gupta

30-Jul-07 23:36

Assembly1 means Assemblyinfo.cs

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....