Optimized the Truncate function

Zyo — Fri, 08 Sep 2006 08:05:13 GMT

In my personal optimization crusade I found the function Truncate called many times and slow.

Here is a way to fully remove the double for loop, multiple array, split and concatenation issue. Simple and working.

Public Shared Function Truncate(ByVal Input As String, ByVal intMaxLen As Int32) As String

If Input Is Nothing Then
Return String.Empty
End If

If Input.Length <= intMaxLen Then
' no need to truncate
Return Input
End If

' search for last space before max lenght
Dim iCutAt As Integer = Input.LastIndexOf(" "c, intMaxLen)

Dim inputCut As String
If iCutAt = -1 Then
' there is no space so cut anywhere
inputCut = Input.Substring(0, intMaxLen)
Else
inputCut = Input.Substring(0, iCutAt)
End If

Return inputCut + "..."

End Function

I haven't done any benchmark but it's probably 100 times faster for both long and short input string.

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Optimized the Truncate function