Allow only 4 numbers after decimal point

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Hi,

At character keypress, how do you code so the following....

1. Only allow numeric and "-"
2. Only allow 2 decimal places
3. Only allow 4 numbers after the decimal point.

Thanks in advance.

Posted 14-Oct-15 6:10am

Central_IT

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Richard Deeming 14-Oct-15 12:20pm

"2 decimal places"
"4 numbers after the decimal point"

Which is it? You can't have both 2 and 4 decimal places at the same time!

You'll also need to specify which UI framework you're using - Windows Forms, WPF, Universal App, Xamarin, ASP.NET WebForms, ASP.NET MVC, or something else?

Maciej Los 14-Oct-15 12:25pm

Not a question at all! Please, provide more details about you have trying to achieve till now and where are you stuck?

Central_IT 15-Oct-15 14:34pm

example....
1234.65 is okay
but will not allow 12345.65.

2 solutions

Solution 2

Not even a question and so little information that one have to guess what you want.
And the question look like a "DoMyWork" which not what we do, it is the wrong place.

Quote:
At character keypress

this let me think that you want to do some formatted input.
There is basically 2 possibilities:
- you do normal input and then you check the input when validated.
- you monitor every event in the textbox, keys presses and cursor moves, and a program of you controls what is done as events are processed.

Unfortunately, this depend on the framework you are using.

I have been doing this for 30 years now, it is a standard feature with xBase family languages (FoxPro, Clipper ...)

I suggest to Google for formatted input for more informations.

Posted 14-Oct-15 9:11am

Patrice T

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-10-14T08:43:00

This is just a matter of formatting the strings representing numeric values.

Please see:
https://msdn.microsoft.com/en-us/library/system.decimal.tostring%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx[^].

—SA