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How do I sort on lastname?

Posted on 2009-07-11
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286 Views
Last Modified: 2012-05-07
I would like to sort on lastname and second on firstname.

how?

I would like to use IComparable
ContactManager.cs
--------------------------------
using System;
using System.Collections.Generic;
using System.Text;
 
namespace Persons
{
    [Serializable]
    public class ContactManager
    {
 
        //Deklaration
        List<Contact> contact;
        bool exists = false;
 
        #region Konstruktor
 
 
 
        public ContactManager()
        {
            contact = new List<Contact>();           
            exists = true;
        } //end CustomerManager
 
 
 
         public ContactManager(List<Contact> constact)
        {
            this.contact = constact;
        } //end CustomerManager
 
        #endregion
        
 
        #region Egenskaper
 
 
 
        public int Count
        {
            get { return contact.Count; }
        } //end Count
 
 
 
        public List<Contact> Contacts
        {
            get { return contact; }
            set { contact = value; }
        } //end Customers
 
 
        #endregion
 
 
        #region Metoder
 
 
 
        public int Search(Contact cust)
        {
            int found = -1;
 
            if (exists)
            {
                for (int i = 0; i < contact.Count; i++)
                {
                    if (contact[i].FirstName.Equals(cust.FirstName) && contact[i].LastName.Equals(cust.LastName))
                    {
                        found = i;
                    } //end if                                    
                } //end for
            } //end if
 
 
            return found;
        } //end Search
 
 
 
        public List<Contact> FindALetterSearch(char letter)
        {
 
            List<Contact> returnList = new List<Contact>();
 
            if (exists)
            {
                returnList = contact.FindAll(c => c.LastName.Trim().ToLowerInvariant().StartsWith(letter.ToString().Trim().ToLowerInvariant()));
 
            } //end if            
            return returnList;
 
 
            
        } //end Search
 
 
        public void DeleteCustomer (int index) 
        {
            if (exists)
            {
                contact.RemoveAt(index);                
            } //end if        
        } //end DeleteCustomer
 
 
 
        public void ChangeCustomer(Contact cust)
        {
 
        }
 
 
        public Contact GetCustomer(int index)
        {
            return null;
        } //end GetCustomer
 
 
 
 
        public void AddCustomer(Contact cust)
        {
            if(exists)
            {
                contact.Add(cust);
            } //end if
 
            else
            {
                contact = new List<Contact>();
                contact.Add(cust);
                exists = true;
            } //end else            
        } //end AddCustomer
 
 
 
 
 
        #endregion
 
    } //end class
} //end namespace
 
 
-------------------------------
Contact.cs
----------------------------
 
using System;
using System.Collections.Generic;
using System.Text;
 
namespace Persons
{
    [Serializable]
    public class Contact : IContact
    {
        #region Attribut
 
        private string m_firstName;
        private string m_lastName;
        private List<Phone> m_phone;
        private Address m_adress;
        private Email m_email;
        private static int m_id;
        private int thiscount;
 
        #endregion
 
 
        #region Konstruktor
 
 
 
        //*******************************************************************
        //          Contact
        //*******************************************************************
        public Contact()
        {
            m_adress = new Address ();
            m_email = new Email ();
            m_lastName = string.Empty;
            m_firstName = string.Empty;
            m_phone = new List<Phone> ();
 
            thiscount = m_id++;
        } //end Contact
 
 
 
        //*******************************************************************
        //          Contact
        //*******************************************************************
        public Contact(string name, string lastname, Address adress, List<Phone> phone, Email email)
        {
            m_adress = adress;
            m_email = email;
            m_lastName = lastname;
            m_firstName = name;
            m_phone = phone;
 
            thiscount = m_id++;
        } //end Contact
 
        #endregion
 
 
 
        #region Egenskaper
 
 
        //*******************************************************************
        //          MyAdress
        //*******************************************************************
        public Address MyAdress
        {
            get { return m_adress; }
            set { m_adress = value; }
        } //end MyAdress
 
 
 
        //*******************************************************************
        //          Id
        //*******************************************************************
        public int Id
        {
            get { return thiscount; }
            set { thiscount = value; }
        } //end Id
 
 
 
        //*******************************************************************
        //          MyEmail
        //*******************************************************************
        public Email MyEmail
        {
            get { return m_email; }
            set { m_email = value; }
        } //end MyEmail
 
 
        //*******************************************************************
        //          FirstName
        //*******************************************************************
        public string FirstName
        {
            get { return m_firstName; }
            set { m_firstName = value; }
        } //end FirstName
 
 
        //*******************************************************************
        //          LastName
        //*******************************************************************
        public string LastName
        {
            get { return m_lastName; }
            set { m_lastName = value; }
        } //end LastName
 
 
        //*******************************************************************
        //          Telephone
        //*******************************************************************
        public List<Phone> Telephone
        {
            get { return m_phone; }
            set { m_phone = value; }
        } //end Telephone
 
 
 
        #endregion
 
 
 
        #region Metoder
 
 
        //*******************************************************************
        //          GetContact
        //*******************************************************************
        public string GetContact()
        {
            return m_lastName;
        } //end GetContact
 
 
 
        //*******************************************************************
        //          ToString
        //*******************************************************************
        public override string ToString()
        {
            return "" + m_firstName + m_lastName + m_adress.ToString() + m_phone.ToString() + m_email.ToString();
        } //end ToString
 
        #endregion
 
 
        #region IContact Members
 
 
        
        /// <summary>
        /// 
        /// </summary>
        /// <param name="fname"></param>
        public void setFirstName(string fname)
        {
            this.FirstName = fname;
        }
 
 
 
        /// <summary>
        /// 
        /// </summary>
        /// <param name="lname"></param>
        public void setLastName(string lname)
        {
            this.LastName = lname;
        }
 
        #endregion
    } //end class
} //end namespace

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Question by:Mickeys
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7 Comments
 
LVL 29

Expert Comment

by:Göran Andersson
ID: 24830396
What is it that you want sorted?
0
 

Author Comment

by:Mickeys
ID: 24830450
my contact.last name   (first)
and then second if there is the same lastname.......it should sort on firstname
0
 
LVL 29

Expert Comment

by:Göran Andersson
ID: 24830522
How you want it sorted is clear, but what is it that you want sorted?
0
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Author Comment

by:Mickeys
ID: 24830559
I have a contactManager
In this there is a contact List.

This list is what I want sorted
0
 

Author Comment

by:Mickeys
ID: 24830565
To be specifc:   List<Contact> contact;
in ContactManager.cs
0
 
LVL 29

Accepted Solution

by:
Göran Andersson earned 500 total points
ID: 24830676
I suggest that you use the interface IComparable<Contact> instead of the interface IComparable.

Make the Contact class implement the interface, and it's CompareTo method:

class Contact : IComparable<Contact> {

   public int CompareTo(Contact other) {
      int result = this.LastName.CompareTo(other.LastName);
      if (result == 0) {
         result = this.FirstName.CompareTo(other.FirstName);
      }
      return result;
   }

   ...

}

Then you can easily sort the contacts:

contact.Sort();
0
 

Author Closing Comment

by:Mickeys
ID: 31602417
Ahhh now I see. Thx it works great as well
0

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