Composite Format Item Syntax
{index[,alignment][:formatString]} |
Explanation
The mandatory index component, also called a parameter specifier, is a number starting from 0 that identifies a corresponding item in the list of objects |
The optional alignment component is a signed integer indicating the preferred formatted field width. If the value of alignment is less than the length of the formatted string, alignment is ignored and the length of the formatted string is used as the field width. The formatted data in the field is right-aligned if alignment is positive and left-aligned if alignment is negative. If padding is necessary, white space is used |
The optional formatString component is a format string that is appropriate for the type of object being formatted |
index Example 1
String.Format("Prime numbers less than 10: {0}, {1}, {2}, {3}", 2, 3, 5, 7)
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Prime numbers less than 10: 2, 3, 5, 7
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index Example 2
String.Format("0x{0:X} {0:E} {0:N}", Int64.MaxValue)
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0x7FFFFFFFFFFFFFFF 9.223372E+018 9,223,372,036,854,775,807.00
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alignment Example
Dim names() As String = {"Adam", "Bridgette", "Carla", "Daniel", "Ebenezer", "Francine", "George"}
Dim hours() As Decimal = {40, 6.667D, 40.39D, 82, 40.333D, 80, 16.75D}
Console.WriteLine(String.Format("{0,-20} {1,5}", "Name", "Hours"))
Console.WriteLine()
For index As Integer = 0 To names.GetUpperBound(0)
Console.WriteLine(String.Format("{0,-20} {1,5}", names(index), hours(index)))
Next
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Name Hours
Adam 40
Bridgette 6.667
Carla 40.39
Daniel 82
Ebenezer 40.333
Francine 80
George 16.75
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formatString Example
String.Format("Name = {0}, hours = {1:hh}, minutes = {1:mm}", "Fred", DateTime.Now)
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Name = Fred, hours = 11, minutes = 30
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