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7 Oct 2008
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.Net Number Formatting
In computing, numeric data are stored as number datatype. Number datatypes
are useful for mathematic calculation but raw number does not format nicely for
readability. If we want to display number to user in special format, we
may need to do something extra. For example, we may want an integer
of 1234 to be displayed as
1,234.00 or 001234 or HK$1,234.
All datatype of Microsoft .Net platform has a ToString() method. Numeric
datatype's ToString() method further allows you to apply various style to the
number before converting it to string. The following
table shows some numeric values converted to string with various styles using
ToString() method.
| Value of myNumber |
ToString() Method |
Output |
| 123 |
myNumber.ToString("00000") |
00123 |
| 1234567 |
myNumber.ToString("#,#") |
1,234,567 |
| 123.4 |
nyNumber.ToString("#.#0") |
123.40 |
| 1234 |
myNumber.ToString("##;(##)") |
1234 |
| -1234 |
myNumber.ToString("##;(##)") |
(1234) |
| 12345 |
myNumber.ToString("HK$#,#.#0") |
HK$12,345.00 |
| 0.012 |
myNumber.ToSting("#0.##%") |
1.2% |
| 85222334455 |
myNumber.ToSting("(###)####-####") |
(852)2233-4455 |
In fact, there are some other combinations. You can do some tests to find out the
actual output.
The following is a simple demo of the above style. You can change the
number and select a style to see what the output looks like.
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