String Manipulation Example
The following example uses some of the methods discussed in the Basic String Operations topics to construct a class that performs string manipulations in a manner that might be found in a real-world application. The MailToData class stores the name and address of an individual in separate properties and provides a way to combine the City, State, and Zip fields into a single string for display to the user. Furthermore, the class allows the user to enter the city, state, and ZIP Code information as a single string; the application automatically parses the single string and enters the proper information into the corresponding property.
For simplicity, this example uses a console application with a command-line interface.
Option Explicit
Option Strict
Imports System
Imports System.IO
Class MainClass
Public Shared Sub Main()
Dim MyData As New MailToData()
Console.Write("Enter Your Name:")
MyData.Name = Console.ReadLine()
Console.Write("Enter Your Address:")
MyData.Address = Console.ReadLine()
Console.Write("Enter Your City, State, and ZIP Code separated by spaces:")
MyData.CityStateZip = Console.ReadLine()
Console.WriteLine("Name: {0}", MyData.Name)
Console.WriteLine("Address: {0}", MyData.Address)
Console.WriteLine("City: {0}", MyData.City)
Console.WriteLine("State: {0}", MyData.State)
Console.WriteLine("ZIP Code: {0}", MyData.Zip)
Console.WriteLine("The following address will be used:")
Console.WriteLine(MyData.Address)
Console.WriteLine(MyData.CityStateZip)
End Sub
End Class
Public Class MailToData
Private strName As String = " "
Private strAddress As String = " "
Private strCityStateZip As String = " "
Private strCity As String = " "
Private strState As String = " "
Private strZip As String = " "
Public Sub New()
End Sub
Public Property Name() As String
Get
Return strName
End Get
Set
strName = value
End Set
End Property
Public Property Address() As String
Get
Return strAddress
End Get
Set
strAddress = value
End Set
End Property
Public Property CityStateZip() As String
Get
Return ReturnCityStateZip()
End Get
Set
strCityStateZip = value
ParseCityStateZip()
End Set
End Property
Public Property City() As String
Get
Return strCity
End Get
Set
strCity = value
End Set
End Property
Public Property State() As String
Get
Return strState
End Get
Set
strState = value
End Set
End Property
Public Property Zip() As String
Get
Return strZip
End Get
Set
strZip = value
End Set
End Property
Private Sub ParseCityStateZip()
Dim CityIndex As Integer
Dim StateIndex As Integer
' Check for an exception if the user did not enter spaces between
' the elements.
Try
' Find index position of the space between
' city and state and assign that value to CityIndex.
CityIndex = strCityStateZip.IndexOf(" ")
' Initialize the CityArray to the value of the
' index position of of the first white space.
Dim CityArray(CityIndex) As Char
' Copy the city to the CityArray.
strCityStateZip.CopyTo(0, CityArray, 0, CityIndex)
' Find index position of the space between
' state and zip and assign that value to CityIndex.
StateIndex = strCityStateZip.LastIndexOf(" ")
' Initialize the StateArray to the length of the state.
Dim StateArray(StateIndex - CityIndex) As Char
' Copy the state to the StateArray.
strCityStateZip.CopyTo(CityIndex, StateArray, 0, StateIndex - CityIndex)
' Initialize the ZipArray to the length of the zip.
Dim ZipArray(strCityStateZip.Length - StateIndex) As Char
' Copy the zip to the ZipArray.
strCityStateZip.CopyTo(StateIndex, ZipArray, 0, strCityStateZip.Length - StateIndex)
' Assign city to the value of CityArray.
strCity = New String(CityArray)
' Trim white spaces, commas, and so on.
strCity = strCity.Trim(New Char() {" "c, ","c, ";"c, "-"c, ":"c})
' Assign state to the value of StateArray.
strState = New String(StateArray)
' Trim white spaces, commas, and so on.
strState = strState.Trim(New Char() {" "c, ","c, ";"c, "-"c, ":"c})
' Assign zip to the value of ZipArray.
strZip = New String(ZipArray)
' Trim white spaces, commas, and so on.
strZip = strZip.Trim(New Char() {" "c, ","c, ";"c, "-"c, ":"c})
' If an exception is encountered, alert the user to enter spaces
' between the elements.
Catch OverflowException As Exception
Console.WriteLine(ControlChars.Lf + ControlChars.Lf + "You must enter spaces between elements." + ControlChars.Lf + ControlChars.Lf)
End Try
End Sub
Private Function ReturnCityStateZip() As String
' Make state uppercase.
strState = strState.ToUpper()
' Put the value of city, state, and zip together in the proper manner.
Dim MyCityStateZip As String = String.Concat(strCity, ", ", strState, " ", strZip)
Return MyCityStateZip
End Function
End Class
[C#]
using System;
class MainClass
{
static void Main(string[] args)
{
MailToData MyData = new MailToData();
Console.Write("Enter Your Name:");
MyData.Name = Console.ReadLine();
Console.Write("Enter Your Address:");
MyData.Address = Console.ReadLine();
Console.Write("Enter Your City, State, and ZIP Code separated by spaces:");
MyData.CityStateZip = Console.ReadLine();
Console.WriteLine("Name: {0}", MyData.Name);
Console.WriteLine("Address: {0}", MyData.Address);
Console.WriteLine("City: {0}", MyData.City);
Console.WriteLine("State: {0}", MyData.State);
Console.WriteLine("Zip: {0}", MyData.Zip);
Console.WriteLine("The following address will be used:");
Console.WriteLine(MyData.Address);
Console.WriteLine(MyData.CityStateZip);
}
}
public class MailToData
{
string name = " ";
string address = " ";
string citystatezip = " ";
string city = " ";
string state = " ";
string zip = " ";
public MailToData()
{
}
public string Name
{
get{return name;}
set{name = value;}
}
public string Address
{
get{return address;}
set{address = value;}
}
public string CityStateZip
{
get
{
return ReturnCityStateZip();
}
set
{
citystatezip = value;
ParseCityStateZip();
}
}
public string City
{
get{return city;}
set{city = value;}
}
public string State
{
get{return state;}
set{state = value;}
}
public string Zip
{
get{return zip;}
set{zip = value;}
}
private void ParseCityStateZip()
{
int CityIndex;
int StateIndex;
// Check for an exception if the user did not enter spaces between
// the elements.
try
{
// Find index position of the space between
// city and state and assign that value to CityIndex.
CityIndex = citystatezip.IndexOf(" ");
// Initialize the CityArray to the value of the
// index position of the first white space.
char[] CityArray = new char[CityIndex];
// Copy the city to the CityArray.
citystatezip.CopyTo(0,CityArray ,0, CityIndex);
// Find index position of the space between
// state and zip and assign that value to CityIndex.
StateIndex = citystatezip.LastIndexOf(" ");
// Initialize the StateArray to the length of the state.
char[] StateArray = new char[StateIndex - CityIndex];
// Copy the state to the StateArray.
citystatezip.CopyTo(CityIndex, StateArray, 0, (StateIndex - CityIndex));
// Initialize the ZipArray to the length of the zip.
char[] ZipArray = new char[citystatezip.Length - StateIndex];
// Copy the zip to the ZipArray.
citystatezip.CopyTo(StateIndex, ZipArray, 0, (citystatezip.Length - StateIndex));
// Assign city to the value of CityArray.
city = new String(CityArray);
// Trim white spaces, commas, and so on.
city = city.Trim(new char[]{' ', ',', ';', '-', ':'});
// Assign state to the value of StateArray.
state = new String(StateArray);
// Trim white spaces, commas, and so on.
state = state.Trim(new char[]{' ', ',', ';', '-', ':'});
// Assign zip to the value of ZipArray.
zip = new String(ZipArray);
// Trim white spaces, commas, and so on.
zip = zip.Trim(new char[]{' ', ',', ';', '-', ':'});
}
// If an exception is encountered, alert the user to enter spaces
// between the elements.
catch(OverflowException)
{
Console.WriteLine("\n\nYou must enter spaces between elements.\n\n");
}
}
private string ReturnCityStateZip()
{
// Make state uppercase.
state = state.ToUpper();
// Put the value of city, state, and zip together in the proper manner.
string MyCityStateZip = String.Concat(city, ", ", state, " ", zip);
return MyCityStateZip;
}
}
When the preceding code is executed, the user is asked to enter his or her name and address. The application places the information in the appropriate properties and displays the information back to the user, creating a single string that displays the city, state, and ZIP Code information.