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The "#" custom specifier in C#
The "#" custom format specifier works as a digit-placeholder symbol.
If the value to be formatted has a digit in the position where the "#" symbol appears in the format string, then that digit is copied to the resultant string.
We have set a double type here.
double d; d = 4.2;
Now, let us use the “#” custom specifier.
d.ToString("#.##", CultureInfo.InvariantCulture)Here are other examples.
Example
using System;
using System.Globalization;
class Demo {
static void Main() {
double d;
d = 4.2;
Console.WriteLine(d.ToString("#.##", CultureInfo.InvariantCulture));
Console.WriteLine(String.Format(CultureInfo.InvariantCulture,"{0:#.##}", d));
d = 345;
Console.WriteLine(d.ToString("#####"));
Console.WriteLine(String.Format("{0:#####}", d));
d = 74567989;
Console.WriteLine(d.ToString("[##-##-##-##]"));
Console.WriteLine(String.Format("{0:[##-##-##-##]}", d));
}
}Output
4.2 4.2 345 345 [74-56-79-89] [74-56-79-89]
Updated on: 23-Jun-2020
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