VB.NET String – String VB.NET
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VB.NET String – String VB.NET
Purpose: – Illustrates using String Properties and String Methods.
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 2008 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 "Language-Basics"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Language-Basics
- Add Class Named clsString to Language-Basics folder
- Right-click Language-Basics folder;
- add new item;
- Select class
- Class name could be clsString
- Click on copy code in code below to copy code into clsString.vb
- Click on copy code in second set of code below to copy code into Module1.vb
- Click green arrow or press F5 to run program
Step 1: Use Copy Code to Cut-n-paste code into clsString.vb
| Visual Basic | | copy code | | ? |
Public Class clsString |
Public Sub Main() |
'**************************************************************************************** |
' Example #1: StartsWith(string) |
' Example #2: EndsWith(string) |
' Example #3: IndexOf(string[, startIndex][,count]) |
' Example #4: LastIndexOf(string[, startIndex][,count]) |
' Example #5: Insert(startIndex, string) |
' Example #6: PadLeft(totalWidth [, paddingCharacter]) |
' Example #7: PadRight(totalWidth [, paddingCharacter]) |
' Example #8: Remove(startIndex, count) |
' Example #9: Replace(oldString, newString) |
' Example #10: Substring(startIndex[, length]) |
' Example #11: ToLower |
' Example #12: ToUpper |
' Example #13: Trim |
' Example #14: Length |
' Example #15: Chars(index) |
'**************************************************************************************** |
'**************************************************************************************** |
' Example #1: StartsWith(string) |
' Returns a Boolean value that indicates if the string starts with the specified string. |
'**************************************************************************************** |
Console.WriteLine("Example #1: StartsWith(string) ") |
Dim strStartsWithExample As String = "This is a test string" |
Console.WriteLine(strStartsWithExample.StartsWith("This")) 'Returns True |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #2: EndsWith(string) |
' Returns a Boolean value that indicates if the string ends with the specified string. |
'**************************************************************************************** |
Console.WriteLine("Example #2: EndsWith(string) ") |
Dim strEndsWithExample As String = "This is a test string" |
Console.WriteLine(strEndsWithExample.EndsWith("string")) 'Returns True |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #3: IndexOf(string[, startIndex][,count]) |
' Returns an integer that represents the position of the first occurrence of the |
' specified number of characters. If you specify startIndex, that specifies |
' where to start looking. If you specify count, that specifies how many characters to |
' to search past start. If the string is not found, this method returns -1 |
'**************************************************************************************** |
Console.WriteLine("Example #3: IndexOf(string[, startIndex][,count]) ") |
Dim strIndexOfExample As String = "This is a test string" |
Console.WriteLine(strIndexOfExample.IndexOf("is")) 'Returns 2 |
Console.WriteLine(strIndexOfExample.IndexOf("xyz")) 'Returns -1 |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #4: LastIndexOf(string[, startIndex][,count]) |
' Returns an integer that represents the position of the last occurrence of the |
' specified number of characters. If you specify startIndex, that specifies |
' where to start looking. If you specify count, that specifies how many characters to |
' to search past start. If the string is not found, this method returns -1 |
'**************************************************************************************** |
Console.WriteLine("Example #4: LastIndexOf(string[, startIndex][,count]) ") |
Dim strLastIndexOfExample As String = "This is a test string" |
Console.WriteLine(strLastIndexOfExample.LastIndexOf("is")) 'Returns 5 |
Console.WriteLine(strLastIndexOfExample.LastIndexOf("xyz")) 'Returns -1 |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #5: Insert(startIndex, string) |
' Returns a string with the specified string inserted beginning at the specified position. |
'**************************************************************************************** |
Console.WriteLine("Example #5: Insert(startIndex, string) ") |
Dim strInsertExample As String = "This is a test string" |
Dim intIndex As Integer = 0 |
' First find position of word test |
intIndex = strInsertExample.IndexOf("test") |
' Insert "simple" before "test" |
Console.WriteLine(strInsertExample.Insert(intIndex, "simple ")) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #6: PadLeft(totalWidth [, paddingCharacter]) |
' Returns a string that is right-aligned and padded on left with character specified. |
' If no padddingCharacter is specified, space is used. totalWidth is total width of column |
' This allows you to create a nice straight column even though lengths of text vary. |
'**************************************************************************************** |
Console.WriteLine("Example #6: PadLeft(totalWidth [, paddingCharacter]) ") |
Dim strPadLeftExampleA As String = "This is a test string" |
Dim strPadLeftExampleB As String = "short" |
Dim strPadLeftExampleC As String = "longer" |
' PadLeft "simple" before "test" |
Console.WriteLine(strPadLeftExampleA.PadLeft(35)) |
Console.WriteLine(strPadLeftExampleB.PadLeft(35)) |
Console.WriteLine(strPadLeftExampleC.PadLeft(35)) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #7: PadRight(totalWidth [, paddingCharacter]) |
' Returns a string that is left-aligned and padded on right with character specified. |
' If no padddingCharacter is specified, space is used. totalWidth is total width of column |
' This allows you to create a nice straight column even though lengths of text vary. |
'**************************************************************************************** |
Console.WriteLine("Example #7: PadRight(totalWidth [, paddingCharacter]) ") |
Dim strPadRightExampleA As String = "This is a test string" |
Dim strPadRightExampleB As String = "short" |
Dim strPadRightExampleC As String = "longer" |
' PadRight "simple" before "test" |
Console.WriteLine(strPadRightExampleA.PadRight(35) + "next column starts here") |
Console.WriteLine(strPadRightExampleB.PadRight(35) + "next column starts here") |
Console.WriteLine(strPadRightExampleC.PadRight(35) + "next column starts here") |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #8: Remove(startIndex, count) |
' Returns a string with the specified number of characters removed starting at startIndex. |
' If no Count is specified, the remainder of string is removed |
'**************************************************************************************** |
Console.WriteLine("Example #8: Remove(startIndex, count) ") |
Dim strRemoveExample As String = "This is a test string" |
Dim intIndexRemove As Integer = 0 |
' First find position of word test |
intIndexRemove = strRemoveExample.IndexOf("test") |
' Remove rest of string starting with word "test" |
Console.WriteLine(strRemoveExample.Remove(intIndex)) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #9: Replace(oldString, newString) |
' Returns a string with all occurences of oldString replaced by newString |
'**************************************************************************************** |
Console.WriteLine("Example #9: Replace(oldString, newString) ") |
Dim strReplaceExample As String = "This is a test string" |
' Replace "This" with "That" |
Console.WriteLine(strReplaceExample.Replace("This", "That")) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #10: 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 #10: Substring(startIndex[, length]) ") |
Dim strSubstringExample As String = "This is a test string" |
Dim intIndexSubstring As Integer = 0 |
' First find position of word test |
intIndexSubstring = strRemoveExample.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() |
'**************************************************************************************** |
' Example #11: ToLower |
' Returns the string in Lowercase |
'**************************************************************************************** |
Console.WriteLine("Example #11: ToLower") |
Dim strToLowerExample As String = "This is a test string" |
' Return Lowercase |
Console.WriteLine(strToLowerExample.ToLower) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #12: ToUpper |
' Returns the string in Uppercase |
'**************************************************************************************** |
Console.WriteLine("Example #12: ToUpper ") |
Dim strToUpperExample As String = "This is a test string" |
' Return Uppercase |
Console.WriteLine(strToUpperExample.ToUpper) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #13: Trim |
' Returns the string with leading and trailing spaces removed |
'**************************************************************************************** |
Console.WriteLine("Example #13: Trim ") |
Dim strTrimExample As String = " ABC " |
' Return Uppercase |
Console.WriteLine(strTrimExample.Trim.Length) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #14: Length |
' Returns the string with leading and trailing spaces removed |
'**************************************************************************************** |
Console.WriteLine("Example #14: Length ") |
Dim strLengthExample As String = " ABC " |
' Return Uppercase |
Console.WriteLine(strLengthExample.Length) |
'write blank line to make output easier to read |
Console.WriteLine() |
'**************************************************************************************** |
' Example #15: Chars(index) |
' Gets the character at the specified index |
'**************************************************************************************** |
Console.WriteLine("Example #15: Chars(index) ") |
Dim strCharsExample As String = "ABC" |
' Return Uppercase |
Console.WriteLine(strCharsExample.Chars(1)) |
'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: Use View Plain to Cut-n-paste code into Module1.vb
| Visual Basic | | copy code | | ? |
Module Module1 |
Sub Main() |
'***** Language-Basics ************* |
Dim myString As New clsString |
myString.Main() |
End Sub |
End Module |
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