C# String format: escape a dot

Question

I have a line of code, something like:

mbar.HealthLabel.text = String.Format("{0:0.0}", _hp);

Output is: 2.25 for example. Is it possible to escape a dot from the output string view with String.Format function ?

For. ex. 225,

To make my question more clear, I need the same effect like:

Math.Floor(_hp * 100).ToString();

But need to do it by String.Format template.. Thanks.

Sinnard

what is the original string in _hp? – Max

Any particular reason why you need to use String.Format? – Penuche

Try doing _hp.Replace(".", "") which replaces dot with empty string – Melatonin

right, just use the Math.Floor alternative you proposed yourself :) – Stockstill

If the underlying problem is that you've only got access to modify the string format, rather than the code itself, you should probably mention that. – Spatola

Like this: mbar.HealthLabel.text = String.Format("{0:0.0}", _hp * 100); ? Note, that string format for numeric values depends on regional settings! – Justification

Is your number always 2 decimal places - like converting dollars to cents? Or could it be 1.2345 and you want that to be 12345 – Oreilly

Possibly of interesting is the % custom format specifier which will multiply a number by 100 and add a percentage sign. You may not want this but on the off chance this is being formatted as a percentage it may be useful. See msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx for more details. – Dermatophyte

Answer 1

Simply you can do it this way

double value = 1.25;

var stringValue = string.Format("{0:0}", value * 100, CultureInfo.InvariantCulture); //125

EDIT: More general solution would be to Replace the dot with empty string as stated in the comments.

double value = 1.25;

var stringValue = value.ToString(CultureInfo.InvariantCulture).Replace(".",string.Empty);

EDIT2: Also there is another general idea that do not use Replace function (but also it does not use the String.Format)

var stringValue = string.Join("", value.ToString().Where(char.IsDigit));

Also another similar idea:

var stringValue = new string(value.ToString().Where(char.IsDigit).ToArray());

Indelible

This is what i exactly suggest in the comment to the question. – Justification

Yes, and the sent time shows both of us were thinking at the same solution at the same time. – Indelible

@HosseinNarimaniRad: I'm assuming (hoping?) that was just an endorsement of your answer rather than any kind of accusation of copying. – Dermatophyte

@MaciejLos if you had an answer you should have posted one. Answers in comments are unhelpful – Oreilly

The way I read the question was that the OP is just requiring the output string to have no dot in it - and that 2.25 was just an example. You solution would only work for values with 2dp. – Penuche

@PaulF: The OP explicitly says that they want the equivalent of *100. – Dermatophyte

@Chris: I took it that that was the effect he wanted for that particular example - the question asks about "escaping a dot". It may be that the OP does want the value to 2dp with no dot in - in which case the answer is valid. – Penuche

Your edit probably needs localization consideration - what if the decimal separator is not a "."? May not be relevant for the OP but you should always bear in mind that decimal and thousand separators (and maybe other elements) may not be consistent. – Dermatophyte

@PaulF: You may be right but if so that was the worst clarification ever. ;-) – Dermatophyte

As i mentioned in my answer, format for numeric string depends on regional settings. I won't recommend methods in Edit#1 and Edit#2 section. This might be the reason of serious troubles, – Justification

Answer 2

First of all, please read my comment to the question. As i mentioned there, string format for numeric values depends on regional settings. So, below line

mbar.HealthLabel.text = String.Format("{0:0.0}", _hp);

will return: 2,25 (as to the polish numeric standard)

In my opinion you need something like this:

mbar.HealthLabel.text = String.Format("{0:D}", Math.Floor(_hp*100));

For furhter details, please see:

Standard Numeric Format Strings

Custom Numeric Format Strings

Justification

Answer 3

Up to Microsoft.NET Framework 4.7 there is no way to solve this when we are only allowed to modify the format string ("template"). All solutions require to either:

• Post-process the resulting string. Here, the closest for the special case with two decimals may be the % format
• Compute the numeric argument first to make it integer
• Write and apply a custom IFormatProvider implementation

Stockstill

Answer 4

If you want to eliminate the decimal separtor ("escape the dot", as you've put it), try replacing the decimal separator with empty string:

string result = String
 .Format("{0:0.0}", _hp)
 .Replace(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator, "");

Sulphurbottom