Visual Basic.NET How to Program (PDF)

Chapter 15 Strings, Characters and Regular Expressions 659
38 buffer.Insert(0, longValue)
39 buffer.Insert(0, " ")
40 buffer.Insert(0, singleValue)
41 buffer.Insert(0, " ")
42 buffer.Insert(0, doubleValue)
43 buffer.Insert(0, " ")
44
45 output = "buffer after inserts:" & vbCrLf & _
46 buffer.ToString() & vbCrLf & vbCrLf
47
48 buffer.Remove(12, 1) ' delete 5 in 2.5
49 buffer.Remove(2, 4) ' delete .333 in 33.333
50
51 output &= "buffer after Removes:" & vbCrLf & _
52 buffer.ToString()
53
54 MessageBox.Show(output, "Demonstrating StringBuilder " & _
55 "Insert and Remove Methods", MessageBoxButtons.OK, _
56 MessageBoxIcon.Information)
57 End Sub ' Main
58
59 End Module ' modBuilderInsertRemove
Fig. 15.14 StringBuilder text insertion and removal (part 2 of 2).
Another useful method included with StringBuilder is Replace. Replace
searches for a specified String or character and substitutes another String or character
in its place. Figure 15.15 demonstrates this method.
1 ' Fig. 15.15: StringBuilderReplace.vb
2 ' Demonstrating method Replace.
3
4 Imports System.Text
5 Imports System.Windows.Forms
6
7 Module modBuilderReplace
8
9 Sub Main()
10 Dim builder1 As StringBuilder = _
11 New StringBuilder("Happy Birthday Jane")
12
13 Dim builder2 As StringBuilder = _
14 New StringBuilder("good bye greg")
Fig. 15.15 StringBuilder text replacement (part 1 of 2).