C＃字符串格式：转义一个点

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.

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());

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

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

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, "");