VB.NET Substring() – Code Sample
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VB.NET Substring Example – Code Sample Syntax
Abstract: – Illustrates using VB.NET Substring Code Example.
*** 2. Substring Syntax ***
Purpose:
Returns the string that starts at the specified position and has the specified
length. If the length is not specified, all of the characters to the end are returned.
Syntax:
inputString.Substring(startIndex[, length])
Parameters |
Description |
inputString |
Required – string that you want to get
a part of.
|
startIndex |
Optional. specifies where to start. Zero-based.
|
length |
Optional. specifies how many characters to
to return past start. If no length is specified, rest of string
is returned.
|
Result Data Type |
Description |
string |
Returns the string that starts at the
specified position and has the specified
length. If the length is not specified,
all of the characters to the end are returned.
|
*** 3. Substring – Quick Example ***
|
Dim strSubstringExample As String = “This is a test string”
Console.WriteLine(strSubstringExample.Substring(0,4)) ‘Returns This
|
*** 4. Substring – Full Example ***
Substring Example Output Screenshot
Step 1: Click Visual Basic to Cut-n-paste code into clsSubstring.vb
Public Class clsSubstring
Public Sub Main()
'****************************************************************************************
' Purpose: Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'
' Syntax: inputString.Substring(startIndex[, length])
'
' Parameter1: inputString - Required - string that you want to get
' a part of.
'
' Parameter2: startIndex - Optional. specifies where to start. Zero-based.
'
' Parameter3: length - Optional. specifies how many characters to
' to return past start. If no length is specified, rest of string
' is returned.
'
' Result: string - Returns the string that starts at the
' specified position and has the specified
' length. If the length is not specified,
' all of the characters to the end are returned.
'
' Quick Example: Dim strSubstringExample As String = "This is a test string"
' Console.WriteLine(strSubstringExample.Substring(0,4)) 'Returns This
'
'****************************************************************************************
'****************************************************************************************
' Example #1: Substring(startIndex[, length])
' Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'****************************************************************************************
Console.WriteLine("Example #1: Substring(startIndex[, length]) ")
Dim strSubstringExample As String = "This is a test string"
Dim intIndexSubstring As Integer = 0
' First find position of word test
intIndexSubstring = strSubstringExample.IndexOf("test")
' Get everything starting at "test" to end of string
Console.WriteLine(strSubstringExample.Substring(intIndexSubstring))
'write blank line to make output easier to read
Console.WriteLine()
'Prevent console from closing before you press enter
Console.ReadLine()
End Sub
End Class |
Public Class clsSubstring
Public Sub Main()
'****************************************************************************************
' Purpose: Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'
' Syntax: inputString.Substring(startIndex[, length])
'
' Parameter1: inputString - Required - string that you want to get
' a part of.
'
' Parameter2: startIndex - Optional. specifies where to start. Zero-based.
'
' Parameter3: length - Optional. specifies how many characters to
' to return past start. If no length is specified, rest of string
' is returned.
'
' Result: string - Returns the string that starts at the
' specified position and has the specified
' length. If the length is not specified,
' all of the characters to the end are returned.
'
' Quick Example: Dim strSubstringExample As String = "This is a test string"
' Console.WriteLine(strSubstringExample.Substring(0,4)) 'Returns This
'
'****************************************************************************************
'****************************************************************************************
' Example #1: Substring(startIndex[, length])
' Returns the string that starts at the specified position and has the specified
' length. If the length is not specified, all of the characters to the end are returned.
'****************************************************************************************
Console.WriteLine("Example #1: Substring(startIndex[, length]) ")
Dim strSubstringExample As String = "This is a test string"
Dim intIndexSubstring As Integer = 0
' First find position of word test
intIndexSubstring = strSubstringExample.IndexOf("test")
' Get everything starting at "test" to end of string
Console.WriteLine(strSubstringExample.Substring(intIndexSubstring))
'write blank line to make output easier to read
Console.WriteLine()
'Prevent console from closing before you press enter
Console.ReadLine()
End Sub
End Class
Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb
Module Module1
Sub Main()
Dim myclsSubstring As New clsSubstring
myclsSubstring.Main()
End Sub
End Module |
Module Module1
Sub Main()
Dim myclsSubstring As New clsSubstring
myclsSubstring.Main()
End Sub
End Module
Prerequistes:
- Install Visual Basic (Express or Standard Edition)
- Install SQL Server Express
- Download Northwind and pubs Database
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
- You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb
Instructions:
- Use Visual Basic 2010 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select Visual Basic for Language
- name of project could be VBNET_Syntax.
- Add New folder named “StringManipulation”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: StringManipulation
- Add Class Named clsSubstring to StringManipulation folder
- Right-click StringManipulation folder;
- add new item;
- Select class
- Class name could be clsSubstring
- Click on Visual Basic in code in step 1 above to copy code into clsSubstring.vb
- Click on Visual Basic in code in step 2 above to copy code into Module1.vb
- Click green arrow or press F5 to run program
|