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How do I sort on lastname?

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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Mickeys
Asked:
Mickeys
  • 4
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1 Solution
 
Göran AnderssonCommented:
What is it that you want sorted?
0
 
MickeysAuthor Commented:
my contact.last name   (first)
and then second if there is the same lastname.......it should sort on firstname
0
 
Göran AnderssonCommented:
How you want it sorted is clear, but what is it that you want sorted?
0
What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

 
MickeysAuthor Commented:
I have a contactManager
In this there is a contact List.

This list is what I want sorted
0
 
MickeysAuthor Commented:
To be specifc:   List<Contact> contact;
in ContactManager.cs
0
 
Göran AnderssonCommented:
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
 
MickeysAuthor Commented:
Ahhh now I see. Thx it works great as well
0
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