Textbox: Convert to float and backwards

sps itsec46

Hi guys! My question is certainly trivial for you... :sigh: I want to convert the text of a textbox to a float with two digits after the separator. And then the whole thing backwards: Convert the float to a string, always showing two digits after the separator. Right now I do it like that:

float myFloat = float.Parse(TextBox1.Text); // string --> float
TextBox1.Text = myFloat.ToString(); // float --> string

Everything works fine except for trailing zeros (e.g. '12,30' or 123,00'). The textbox doesn't show any trailing zeros. (I use a comma as separator cause it's a german application) What can I do to show trailing zeros? Do I have to use IFormatProvider in some way? Btw... these variables represent amounts of money (€). Is it possible to set somthing like a "currency-mode" for the textbox? Many thanks in advance! :rose: mYkel

Charlie Williams

TextBox1.Text = myFloat.ToString("F"); Charlie if(!curlies){ return; }

OmegaSupreme

TextBox1.Text = myFloat.ToString("c"); check out Chris Sells format designer to experiment with format strings : http://www.sellsbrothers.com/tools/#FormatDesigner

The smaller the mind the greater the conceit. Aesop

Heath Stewart

"C" and "c" are the format specifiers for currency, so unless you want a currency symbol in your number, don't use it. Instead, use "F" or "f" instead.

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OmegaSupreme

Good point, he did say 'Is it possible to set somthing like a "currency-mode" for the textbox?' though so I though thats what he wanted. Cheers.

The smaller the mind the greater the conceit. Aesop

Heath Stewart

You're absolutely right, sorry! A lot of sentences in there and I guess I missed the last one. :-O In any case - to the original poster if you're following along - you should look at the CultureInfo class and its related properties (IFormatProvider implementations). For most ToString overloads (not the override from Object or another base class), the IFormatProvider (like the NumberFormatInfo) is used for the Thread.CurrentUICulture, so you don't really need to specify one unless you want to format for a different culture (just for that instance, otherwise you should set Thread.CurrentUICulture and re-initialize your controls) or pass your own IFormatProvider. Typically, such a ToString method (or methods like String.Format) will specify if they use the current CultureInfo for the format specifier.

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sps itsec46

Thanks so much for your numerous and quick answers! I knew there is a simple solution... ;) The myFloat.ToString("F") does all I need. There's no difference between "f" and "F", right? Regards, mYkel

Heath Stewart

Mykel wrote: There's no difference between "f" and "F", right? Nope. See the documentation for NumberFormatInfo in the .NET Framework SDK for more information.

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