IComparable<T>.CompareTo Method

Parameters

• other
  Type: T
  An object to compare with this object.

Return Value

Type: System.Int32
A 32-bit signed integer that indicates the relative order of the objects being compared. The return value has the following meanings:

Public Class Address : Implements IComparable(Of Address)

   Private addr1, addr2, cty, st, coun, postal As String

   Public Sub New(address1 As String, address2 As String, city As String, _
                  state As String, postal As String, country As String)
      Me.addr1 = address1
      Me.addr2 = address2
      Me.cty = city
      Me.st = state
      Me.coun = country
      Me.postal = postalCode      
   End Sub

   Public Property Address1 As String
      Get
         Return Me.addr1
      End Get
      Set
         Me.addr1 = value
      End Set
   End Property

   Public Property Address2 As String
      Get
         Return Me.addr2
      End Get
      Set
         Me.addr2 = value
      End Set
   End Property

   Public Property City As String
      Get
         Return Me.cty
      End Get
      Set
         Me.cty = value
      End Set
   End Property

   Public Property State As String
      Get
         Return Me.st
      End Get
      Set
         Me.st = value
      End Set
   End Property

   Public Property Country As String
      Get
         Return Me.coun
      End Get
      Set
         Me.coun = value
      End Set
   End Property

   Public Property PostalCode As String
      Get
         Return Me.postal
      End Get
      Set
         Me.postal = value
      End Set
   End Property

   Public Overrides Function ToString() As String
      Return addr1 & vbCrLf & CStr(IIf(Not String.IsNullOrEmpty(addr2), addr2 & vbCrLf, "")) _
             & cty & ", " & st & " " & postal & " " & coun
   End Function

   Public Function CompareTo(other As Address) As Integer _
       Implements IComparable(Of Address).CompareTo

      ' If other is Nothing, this instance is greater.
      If other Is Nothing Then Return 1

      Dim otherAddress As String = other.Country & other.State & other.PostalCode & _
                                   other.City & other.Address1 & other.Address2
      Return (coun & st & postal & cty & addr1 & addr2).CompareTo(otherAddress)
   End Function
End Class

Module Example
   Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
      Dim addresses As New List(Of Address)
      addresses.Add(New Address("106 East 5th St.", "", "New City", "MI", "48002", "USA"))
      addresses.Add(New Address("47 East End Rd.", "", "Huxenplux", "NJ", "20203", "USA"))
      addresses.Add(New Address("12043 N.E. 72nd St.", "", "Belleville", "WA", "98101", "USA"))
      addresses.Sort()
      For Each address As Address In addresses
         outputBlock.Text &= address.ToString() & vbCrLf & vbCrLf
      Next
   End Sub
End Module

using System;
using System.Collections.Generic;

public class Address : IComparable<Address>
{
   private string addr1, addr2, cty, st, coun, postal;

   public Address(string address1, string address2, string city, 
                  string state, string postalCode, string country)
   {                  
      this.addr1 = address1;
      this.addr2 = address2;
      this.cty = city;
      this.st = state;
      this.coun = country;
      this.postal = postalCode;      
   }

   public string Address1
   {
      get { return this.addr1; }
      set { this.addr1 = value; }
   }

   public string Address2
   {
      get {return this.addr2; }
      set { this.addr2 = value; }
   }

   public string City
   {
      get { return this.cty; }
      set { this.cty = value; }
   }

   public string State
   {
      get { return this.st; }
      set { this.st = value; }
   }

   public string Country
   {
      get { return this.coun; }
      set { this.coun = value; }
   }

   public string PostalCode
   {
      get {return this.postal; }
      set {this.postal = value; }
   }

   public override string ToString()
   {
      string addressLine2 = string.IsNullOrEmpty(addr2) ? "" : addr2 + "\n";
      return addr1 + "\n" + addressLine2 +              
             cty + ", " + st + " " + postal + " " + coun;
   }

   public int CompareTo(Address other)
   {
      // If other is null, this instance is greater.
      if (other == null) return 1;

      string otherAddress = other.Country + other.State + other.PostalCode +
                                   other.City + other.Address1 + other.Address2;
      return (coun + st + postal + cty + addr1 + addr2).CompareTo(otherAddress);
   }
}

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      List<Address> addresses = new List<Address>();
      addresses.Add(new Address("106 East 5th St.", "", "New City", "MI", "48002", "USA"));
      addresses.Add(new Address("47 East End Rd.", "", "Huxenplux", "NJ", "20203", "USA"));
      addresses.Add(new Address("12043 N.E. 72nd St.", "", "Belleville", "WA", "98101", "USA"));
      addresses.Sort();
      foreach (Address address in addresses)
         outputBlock.Text += address.ToString() + "\n\n";

   }
}